Dokumente online komprimieren
Reduzieren Sie die Dateigrößen von Dokumenten mit Qualitätskontrolleinstellungen - PDF, Word, Excel, PowerPoint
Legen Sie Ihre Dokumente hier ab
oder klicken Sie, um Dateien zu durchsuchen
Unterstützte Dokumentenformate
Komprimieren Sie alle gängigen Dokumentdateitypen mit anpassbaren Qualitätseinstellungen
Textverarbeitung
Microsoft Word 97-2003 Document - legacy binary file extension used by older Word versions. Supports rich text formatting, images, tables, and complex layouts. Maximum compatibility with legacy systems and older Microsoft Office versions (Office 97-2007). File sizes typically larger than modern DOCX. Common in corporate archives, legacy document management systems, and environments requiring backwards compatibility. Still widely supported but superseded by DOCX for new documents.
Microsoft Word 2007+ Document - modern XML-based extension providing better compression (40-75% smaller than DOC), improved recovery from corruption, and enhanced features. Open XML standard with better data extraction capabilities. Supports all Word features including styles, themes, SmartArt, advanced formatting, and embedded objects. Industry standard for word processing. Native format for Microsoft Word 2007+, compatible with Google Docs, LibreOffice, and all modern office suites. Essential for professional documents, collaborative editing, and modern workflows.
OpenDocument Text - open standard file extension for word processors developed by OASIS consortium. Native format for LibreOffice Writer and Apache OpenOffice Writer. XML-based structure ensuring long-term accessibility and vendor independence. Supports advanced formatting, styles, images, tables, and all standard word processing features. Excellent for open-source environments, government documents (mandated in many countries), and avoiding vendor lock-in. Free from licensing restrictions and patent concerns.
Rich Text Format - universal document extension developed by Microsoft (1987) for cross-platform text exchange. Readable by virtually all word processors (Word, WordPad, LibreOffice, Google Docs, Pages). Supports basic formatting (fonts, colors, styles, tables) without complex features. Larger file sizes than modern formats but maximum compatibility. Perfect for sharing formatted documents across different systems, email attachments ensuring readability, and legacy system compatibility. Reliable intermediate format for document conversion.
Word Macro-Enabled Document - Microsoft Word file type that supports embedded VBA macros and automation scripts. Similar to DOCX but with programmable functionality allowing automated tasks, custom buttons, and complex workflows. Used in business environments for automated form filling, data processing, report generation, and custom document workflows. Slightly larger files due to macro code. Essential for organizations using document automation, custom business processes, and workflow optimization. Security note: Can contain executable code, so only open DOCM files from trusted sources.
Word Document Template - legacy template extension for Microsoft Word 97-2003 used as blueprints for creating new documents. Contains predefined styles, formatting, placeholder text, headers, footers, and page layouts that serve as starting points for standardized documents. When you open a DOT file, Word creates a new document based on the template, preserving the original template. Common in corporate environments for letterheads, invoices, reports, contracts, and standardized forms. Ensures brand consistency and saves time on document creation. Still compatible with modern Word versions but DOTX is preferred for new templates.
Word Template (XML format) - modern template file type for Microsoft Word 2007+ using Open XML standard. Creates new documents with predefined styles, themes, layouts, and content structure while keeping the template unchanged. Smaller file sizes than DOT through better compression. Supports all modern Word features including themes, building blocks, content controls, and advanced formatting options. Industry standard for professional document templates. Perfect for business stationery, form letters, report templates, branded documents, and standardized corporate communications. Ensures consistency across organization-wide documentation.
Word Macro-Enabled Template - Microsoft Word template format that combines template functionality with VBA macro support for automated workflows. Creates new documents with both predefined formatting AND programmable automation. Perfect for sophisticated business templates that need automatic data population, custom form validation, automated calculations, or integration with external data sources. Common in enterprise environments for complex forms, automated report generation, invoice systems, and workflow-driven documents. More powerful than DOTX but requires macro security considerations.
AbiWord Document - native file format for AbiWord, a free and open-source word processor that's lightweight and fast. XML-based format supporting basic word processing features including fonts, styles, images, tables, and lists. Designed for simplicity and speed rather than advanced features. Particularly popular in Linux environments, older computers with limited resources, and educational settings. Files are generally compatible with other word processors through conversion. Good choice when you need a simple, resource-efficient word processor without the complexity of Microsoft Office or LibreOffice. Ideal for basic letter writing, simple reports, and everyday document tasks.
Applix Word Document - proprietary format from Applixware (later VistaSource Applixware), an office suite popular on Unix and Linux systems in the 1990s and early 2000s. Primarily a historical format now largely obsolete but occasionally encountered in legacy business archives and old Unix-based systems. Supported basic word processing features including formatting, tables, and graphics. While Applixware itself is discontinued, some document converters maintain limited support for accessing old AW files. Mainly relevant for data migration projects, archival purposes, or accessing legacy business documents from organizations that used Applixware.
DocBook XML-Dokument - semantisches Auszeichnungsformat, das speziell für technische Dokumentation, Softwarehandbücher, Bücher und Artikel entwickelt wurde. Im Gegensatz zu typischen Textverarbeitungsprogrammen konzentriert sich DocBook auf die Dokumentstruktur und -bedeutung anstelle des visuellen Erscheinungsbildes. Inhalte werden nach Zweck (Kapitel, Abschnitt, Verfahren, Codebeispiel) gekennzeichnet, was eine Single-Source-Publikation in mehrere Formate (PDF, HTML, EPUB, Man-Seiten) ermöglicht. Branchenstandard in der technischen Dokumentation, Softwaredokumentation und Buchverlag. Wird von großen Technologieunternehmen, Open-Source-Projekten und technischen Verlagen verwendet. Perfekt für die Pflege großer Dokumentationssätze, Multi-Format-Publikationen und langfristige Dokumentenpflege. Steile Lernkurve, aber leistungsstark für technische Inhalte.
KWord Document - native format for KWord, the word processor component of KOffice (now Calligra Suite), primarily used in KDE desktop environments on Linux. Frame-based layout system allowing flexible document design with text, images, and objects positioned independently. Supports standard word processing features plus advanced layout capabilities. Less common than mainstream formats but still encountered in KDE/Linux environments and legacy KOffice workflows. Files can be converted to more universal formats when broader compatibility is needed. Mainly relevant for Linux users working within the KDE ecosystem or accessing old KOffice documents.
StarOffice Writer Document - native format for StarOffice Writer (precursor to OpenOffice and LibreOffice), used primarily in the late 1990s and early 2000s. XML-based format supporting comprehensive word processing features including styles, tables, images, and complex formatting. Historical significance as it influenced the development of the OpenDocument Format (ODT). While StarOffice is discontinued, the format is still supported by OpenOffice and LibreOffice for legacy document access. Commonly encountered when migrating old StarOffice installations or accessing archived documents from organizations that used StarOffice before transitioning to OpenOffice/LibreOffice. Convert to ODT or DOCX for modern compatibility.
Reiner Text - einfachstes Dokumentformat, das nur unformatierten ASCII- oder Unicode-Zeichen enthält. Keine Schriftarten, Farben, Bilder oder Layoutinformationen. Universelle Kompatibilität über alle Plattformen, Texteditoren und Systeme hinweg. Möglichst kleine Dateigrößen. Perfekt für Notizen, Code, Skripte, Protokolle und jede Situation, die absolute Einfachheit und Portabilität erfordert. Essentielles Format für Programmierung, Konfigurationsdateien, Datenaustausch und Szenarien, in denen Formatierung nicht erforderlich ist. Funktioniert auf jedem Gerät von Großrechnern bis Smartphones.
Tabellenkalkulation
Microsoft Excel 97-2003 Workbook - legacy binary spreadsheet format supporting up to 65,536 rows and 256 columns per sheet. Contains formulas, formatting, charts, and multiple worksheets. Compatible with older Excel versions (Excel 97-2007). File size limited to ~30MB. Common in legacy business systems, old financial databases, and environments requiring Excel 97-2003 compatibility. Being replaced by XLSX but still encountered in corporate archives and legacy data systems.
Microsoft Excel 2007+ Workbook - modern XML-based spreadsheet format with 1,048,576 rows and 16,384 columns per sheet. Provides better compression (75% smaller than XLS), improved recovery from corruption, and enhanced features. Supports all Excel capabilities including formulas, pivot tables, charts, conditional formatting, and macros (in XLSM variant). Industry standard for spreadsheets. Compatible with Google Sheets, LibreOffice Calc, and all modern office suites. Essential for data analysis, financial modeling, and business intelligence.
OpenDocument Spreadsheet - open standard format for spreadsheet applications developed by OASIS. Native format for LibreOffice Calc and Apache OpenOffice Calc. XML-based structure ensuring data accessibility and vendor independence. Supports formulas, charts, multiple sheets, and standard spreadsheet features. Excellent for open-source workflows, government use (mandated by many countries), and avoiding Microsoft Office licensing. Free from proprietary restrictions with long-term document accessibility guarantees.
Comma-Separated Values - einfaches Textformat für tabellarische Daten, bei dem jede Zeile eine Zeile darstellt und Kommas die Spalten trennen. Universelles Datenaustauschformat, das von allen Tabellenkalkulationsanwendungen, Datenbanken und Programmiersprachen gelesen werden kann. Keine Formatierung, Formeln oder mehrere Blätter - nur reine Daten. Kleinste Dateigrößen für tabellarische Daten. Perfekt für Datenimport/-export, Datenbankoperationen, Datenanalyse mit Python/R und das Teilen von Datensätzen. Essentielles Format für Data Science, Webanwendungen und Systemintegration. Funktioniert mit Excel, Datenbanken und jedem Datenverarbeitungstool.
Präsentation
Microsoft PowerPoint 97-2003 Presentation - legacy binary format for slide presentations. Supports slides, animations, transitions, embedded media, and speaker notes. Compatible with older PowerPoint versions (PowerPoint 97-2007). File sizes larger than modern PPTX. Common in legacy presentation archives, older corporate training materials, and environments requiring backwards compatibility. Still playable but superseded by PPTX for new presentations. Found in archived presentations from pre-2007 era.
Microsoft PowerPoint 2007+ Presentation - modern XML-based format providing better compression (up to 75% smaller than PPT), improved recovery, and enhanced multimedia support. Supports all PowerPoint features including advanced animations, transitions, embedded videos, SmartArt, themes, and master slides. Industry standard for presentations. Native format for PowerPoint 2007+, compatible with Google Slides, LibreOffice Impress, and Keynote. Essential for business presentations, educational slideshows, and professional communication.
OpenDocument Presentation - open standard format for presentation software developed by OASIS consortium. Native format for LibreOffice Impress and Apache OpenOffice Impress. XML-based structure ensuring long-term accessibility. Supports slides, animations, transitions, multimedia, and standard presentation features. Excellent for open-source environments, government presentations, and avoiding vendor lock-in. Free from licensing restrictions. Compatible with PowerPoint through conversion but best used within open-source office suites.
Andere Formate
Portable Document Format - universal document format developed by Adobe maintaining exact visual appearance across all platforms and devices. Preserves fonts, images, layouts, and formatting precisely. Industry standard for document distribution, official documents, forms, archival, and printing. Not designed for editing (though modern tools allow limited editing). Supports encryption, digital signatures, forms, annotations, and accessibility features. Essential for contracts, invoices, reports, e-books, and any document requiring consistent appearance. Most widely supported document format globally.
DjVu-Dokument - spezialisiertes Dateiformat, das für die Speicherung gescannter Dokumente, insbesondere Bücher, Zeitschriften, historische Manuskripte und bildlastige Dokumente optimiert ist. Entwickelt von AT&T Labs in den späten 1990er Jahren, um das Problem des hochwertigen Scannens von Dokumenten mit minimalen Dateigrößen zu lösen. Verwendet fortschrittliche Kompressionstechniken, die Text, Strichzeichnungen und fotografische Bereiche trennen und eine 5- bis 10-mal bessere Kompression als PDF für gescannte Materialien erreichen. Besonders beliebt in digitalen Bibliotheken, akademischen Archiven und der Erhaltung historischer Dokumente. Unterstützt mehrere Seiten, OCR-Textschichten für Durchsuchbarkeit und Anmerkungen. Perfekt für die Digitalisierung großer Buchsammlungen, die Archivierung historischer Dokumente und die effiziente Verteilung hochwertiger gescannter Materialien. Häufig in den digitalen Geisteswissenschaften, Bibliothekswissenschaft und Dokumentenerhaltungsprojekten.
XML Paper Specification - Microsoft's alternative to PDF developed as a fixed-layout document format that preserves exact visual appearance across different systems. Introduced with Windows Vista as a built-in Windows document format. Uses Open XML and ZIP container technology. Supports fonts, images, vector graphics, metadata, digital signatures, and print-ready layouts. Native format for Microsoft's printing system. While technically capable, XPS never achieved widespread adoption outside the Windows ecosystem due to PDF's dominance. Mainly encountered in Windows environments, some government systems, and legacy workflows. Modern usage is limited as PDF remains the preferred universal fixed-layout format. Useful primarily for Windows-specific workflows or legacy document compatibility.
Open XML Paper Specification - evolved version of XPS standardized by Ecma International (ECMA-388) to create an open, vendor-neutral fixed-layout document format. Addressed some limitations of original XPS and attempted to provide a more open alternative to PDF. Supports high-quality printing, digital signatures, fonts embedding, and precise layout preservation. Despite standardization efforts, OXPS faces the same adoption challenges as XPS—PDF remains dominant for fixed-layout documents. Mainly relevant in specific enterprise environments, some government agencies preferring open standards, or when working with modern Windows printing systems. Limited support outside Windows ecosystem. Consider converting to PDF for better compatibility and wider software support.
Markdown - leichte Auszeichnungssprache, die eine einfache Textformatierungssyntax zur Erstellung formatierter Dokumente verwendet. Einfache Symbole (* für Kursiv, ** für Fett, # für Überschriften) werden in HTML umgewandelt. Menschlich lesbar im Klartext. Perfekt für README-Dateien, Dokumentation, Blogs, Notizen und technische Schreibarbeiten. Beliebt bei Entwicklern, technischen Autoren und Inhaltsproduzenten. Unterstützt Überschriften, Listen, Links, Bilder, Codeblöcke und grundlegende Formatierungen. Extrem portabel und zukunftssicher. Grundlage vieler statischer Website-Generatoren und Dokumentationssysteme.
HyperText Markup Language - standardisierte Auszeichnungssprache für Webseiten, die Text, Bilder, Links und Multimedia enthält. In jedem Webbrowser ohne spezielle Software lesbar. Unterstützt Styling (CSS), Interaktivität (JavaScript) und das Einbetten von reichhaltigen Medien. Universeller Webstandard seit 1991. Perfekt für Webpublikationen, Online-Dokumentation, E-Mail-Newsletter und barrierefreie Inhalte. Extrem portabel mit garantierter langfristiger Unterstützung. Kann aus Dokumenten für die Webverteilung konvertiert oder für die Offline-Anzeige archiviert werden.
Electronic Publication - open standard e-book format based on HTML, CSS, and XML. Reflowable text adapts to any screen size. Supports fonts, images, metadata, table of contents, and CSS styling. Industry standard for e-books compatible with most e-readers (Kindle via conversion, Kobo, Nook, Apple Books, Google Play Books). Perfect for digital publishing, self-publishing, and distributing long-form content. EPUB 3 adds multimedia and interactivity. Essential format for authors, publishers, and digital libraries.
Professionelles Dokumentkomprimierungstool
Compress your documents to reduce file sizes while maintaining quality. Supports all major formats including Microsoft Office (DOC, DOCX, XLS, XLSX, PPT, PPTX), OpenDocument (ODT, ODS, ODP), PDF, and more. Our compressor optimizes images, removes unnecessary metadata, and adjusts resolution to achieve significant file size reductions perfect for email, storage, and web use.
Dokumentenkompressor FAQ
Why compress document files?
Document compression reduces file sizes to solve common problems: Email attachments exceeding size limits (most email services limit 10-25MB), slow upload/download times eating bandwidth, storage space running out on devices or cloud services, website loading slowly due to large documents, sharing difficulties when file sizes are too large. A typical 5MB Word document with images can often be compressed to 1-2MB without visible quality loss.
Real-world benefits: Email - Attach more files within size limits, send documents faster. Storage - Save 40-70% disk space on document archives. Web - Faster page loads for downloadable documents. Sharing - Quicker transfers via messaging apps, cloud services. Archival - Store more historical documents in less space. Mobile - Reduce data usage when downloading documents.
When compression helps most: Documents with high-resolution images (presentations, reports with photos), PDFs with unoptimized graphics, Office files with embedded media, documents destined for web distribution, email attachments nearing size limits, batch document uploads to cloud services. Our compressor provides quality control so you can balance file size vs. visual quality based on your specific needs.
How does document compression work?
Document compression reduces file size through multiple techniques: Image optimization - Reduces resolution and quality of embedded photos without noticeable loss (biggest space saver). Metadata removal - Strips out hidden data like edit history, comments, revision tracking, document properties. Resolution adjustment - Lowers DPI (dots per inch) for images appropriate to use case (web vs. print). Duplicate removal - Eliminates redundant embedded resources.
Our quality presets: Fast (Low quality, 72 DPI) - Smallest files for basic documents, web use, email. Normal (Medium quality, 96 DPI) - Balanced compression for general use, default setting. Maximum (High quality, 150 DPI) - Better quality for important documents, minor compression. Ultra (High quality, 300 DPI) - Minimal compression for print-quality needs, archives. Each preset automatically adjusts all settings for optimal results at that quality level.
What's compressed: Images and graphics embedded in documents (up to 80% size reduction), page thumbnails and previews, metadata and hidden content, font embedding data (sometimes). What's NOT affected: Text content (fully preserved), document structure and formatting, hyperlinks and bookmarks, core document functionality. You retain a fully functional document at reduced file size.
What compression settings should I use?
Choose based on your document's purpose: For Email (size is critical): Use Fast or Normal preset. Target 40-60% size reduction. Images can be lower quality since viewed on screen. Optimize for attachment limits (typically 10-25MB). For Web (loading speed matters): Use Normal preset. Balance quality vs. download time. 96 DPI is sufficient for screen viewing. Faster page loads improve user experience.
For Storage/Archive (balance needed): Use Normal or Maximum preset. Preserve reasonable quality for future use. Reduce storage costs while maintaining usability. Consider creating high-quality archive + compressed working copy. For Print (quality critical): Use Maximum or Ultra preset. Maintain 150-300 DPI for crisp printing. Smaller compression to preserve detail. Only compress when absolutely necessary for print documents.
Advanced options explained: Quality Level (Low/Medium/High) - Overall compression aggressiveness. DPI Setting - Image resolution, higher = better quality, larger files. Optimize Images - Enables image compression algorithms. Remove Metadata - Strips edit history, comments, properties. Start with Normal preset and adjust if needed. Preview compressed result before finalizing important documents.
Will I lose quality when compressing documents?
Quality loss depends on your settings: Text content - NEVER affected by compression, always remains crisp and readable. Images in document - May show slight quality reduction depending on preset chosen (Fast shows more reduction than Ultra). Charts and graphics - Vector graphics (shapes, charts) maintain quality, raster graphics (photos) may compress. Document structure - Fully preserved including formatting, layouts, styles.
Visible vs. invisible quality loss: Invisible loss (acceptable for most uses): Slight image quality reduction not noticeable at normal viewing, metadata removal (edit history, comments you don't need), resolution reduction appropriate for screen viewing (web documents). Visible loss (avoid for important documents): Excessive compression causing image artifacts, DPI too low for print output, noticeable blurriness in photos or graphics.
Best practices to maintain quality: Start with Normal preset and test results, use Maximum/Ultra for documents with important images, avoid re-compressing already compressed documents, keep original uncompressed version for archival, preview compressed document before finalizing, use higher settings for print-destined documents. Remember: A 50% file size reduction with imperceptible quality loss is often achievable. For critical documents, use Maximum preset to prioritize quality over compression ratio.
Can I compress multiple documents at once?
Yes! Batch compression is fully supported: Upload multiple documents (drag-and-drop or select multiple files), choose compression settings once (applies to all files), compress all documents together (processed simultaneously), download individually or as ZIP archive (your choice). Perfect for: Preparing document folders for upload, compressing email attachments in bulk, reducing storage space in document libraries, optimizing website download sections.
Batch compression scenarios: Email preparation - Compress 10 report PDFs before sending, all stay under attachment limit. Storage optimization - Compress 100 archived Word documents, save 60% disk space. Web optimization - Compress all downloadable documents on website, improve user experience. Cloud upload - Compress documents before uploading to Google Drive/Dropbox, save bandwidth and time. Document migration - Compress legacy files before moving to new system.
Batch compression tips: Group similar documents together (same type and purpose), use consistent settings for similar use cases, test with a few files first to verify quality, organize output files with clear naming, verify important files individually after compression, keep original files until confirming results. No file size limits, unlimited number of files. Process typically takes 2-10 seconds per file depending on size and complexity.
How much can I reduce PDF file sizes?
PDF compression results vary significantly based on content: Image-heavy PDFs (presentations, reports with photos) - 50-80% size reduction possible. Text-only PDFs - 10-30% reduction (already well-compressed). Mixed content PDFs - 30-60% typical reduction. Already optimized PDFs - Limited additional compression possible. Best results come from PDFs with high-resolution unoptimized images.
Example compression scenarios: 10MB presentation PDF with photos → 2-4MB (60-80% reduction), 5MB report with charts and images → 2-3MB (40-60% reduction), 2MB text-heavy document → 1.5MB (25% reduction), 1MB already optimized PDF → 0.8-0.9MB (10-20% reduction). The more unoptimized content, the better compression ratios. Scanned PDFs with high-DPI images compress especially well.
Factors affecting PDF compression: Original image quality (higher resolution = more compression potential), image type (photos compress more than text), existing optimization (pre-compressed PDFs don't shrink much), compression settings chosen (Fast vs. Ultra), content type (images vs. text ratio). Use Normal preset for balanced results. For maximum compression while maintaining readability, try Fast preset. Always preview results to ensure acceptable quality for your use case.
Can I compress Word documents (DOC/DOCX)?
Absolutely! Word document compression is very effective: DOCX with images - 40-70% size reduction typical (images are main compression target). DOC files - 20-50% reduction plus modernization benefits. Documents with embedded media - Significant compression possible. Text-only documents - Modest reduction (10-20%), but every byte helps. Word documents often contain unoptimized images making them excellent compression candidates.
What gets compressed in Word files: Embedded images and photos (biggest space saver, can reduce by 70-90%), document thumbnails and preview images, revision history and tracked changes (when removed), comments and hidden content (metadata removal), font embedding data (when not needed). Your text, formatting, styles, tables, and document structure remain completely intact and functional.
Word compression tips: Save massive space on reports with photos, compress before emailing (stay under attachment limits), optimize documents for web download, reduce storage costs for document archives, clean up bloated legacy Word files. Best settings: Normal preset for general use, Fast for email attachments, Maximum for important documents needing quality preservation. Always preview compressed document to verify it meets your needs before finalizing.
How do I compress Excel and PowerPoint files?
Excel (XLS/XLSX) compression: Spreadsheets with charts and images compress well (30-60% reduction). Data-only spreadsheets see modest compression (10-30%). Embedded charts, pivot table caches, and cell formatting contribute to file size. Our compressor optimizes images in charts, removes cached data when safe, and reduces unnecessary formatting overhead. Best for: Report spreadsheets with graphs, dashboard files with embedded visuals, workbooks with many sheets.
PowerPoint (PPT/PPTX) compression: Presentation files are excellent compression candidates (40-70% typical reduction). Each slide with images, graphics, and backgrounds adds size. Unoptimized photos in slides are main compression target. Our compressor: Reduces image resolution appropriately, removes slide thumbnails, optimizes embedded graphics, cleans slide master data. Perfect for: Photo-heavy presentations, sales decks, training materials, conference presentations destined for email or web.
Compression tips by file type: Excel - Use Normal preset for reports, backup before compressing if file contains critical macros, test formulas after compression, consider CSV export for data-only needs. PowerPoint - Use Normal/Fast for web distribution, use Maximum for presentations you'll present from, compress before emailing large decks, keep original for further editing. Both formats benefit significantly from image optimization while maintaining full functionality.
Is document compression free with no limits?
Yes, completely free with generous limits: No registration required - Start compressing immediately without account creation. No daily limits - Compress as many documents as needed. No hidden costs - All features available free forever. No file size limits.No watermarks - Professional results without branding. No quality restrictions - Access all compression presets and settings.
What you get for free: All document formats supported (PDF, Word, Excel, PowerPoint, OpenDocument), all quality presets (Fast, Normal, Maximum, Ultra), advanced settings (DPI control, image optimization, metadata removal), batch compression (multiple files at once), secure processing (encrypted uploads, automatic deletion), unlimited daily use (no quotas or restrictions). Our mission is providing professional document compression tools accessible to everyone.
Fair use policy: 10MB maximum per file (typical business documents are 1-5MB), reasonable batch sizes (don't upload 10,000 files simultaneously), personal and commercial use welcome (businesses can use freely), automated/bot usage prohibited (please use reasonably). These limits ensure service availability for all users. For enterprise needs with very large files (100MB+) or bulk processing (millions of files), contact us about custom solutions. Otherwise, compress away - it's truly free!
What formats can be compressed?
Comprehensive format support: Word Processing - DOC, DOCX, ODT, RTF, DOCM, DOT, DOTX, DOTM (Microsoft Word, OpenDocument Text, templates). Spreadsheets - XLS, XLSX, ODS, CSV (Microsoft Excel, OpenDocument Spreadsheet). Presentations - PPT, PPTX, ODP (Microsoft PowerPoint, OpenDocument Presentation). PDFs - PDF, XPS, OXPS (Portable Document Format, XML Paper Specification). Other - EPUB, DJVU, HTML, MD (e-books, web formats, markup).
Compression effectiveness by format: Excellent compression (40-70% typical): DOCX/DOC with images, PPTX/PPT presentations, PDF with photos, EPUB with images. Good compression (30-50%): XLSX/XLS with charts, ODT with graphics, image-heavy reports. Modest compression (10-30%): Text-heavy documents, spreadsheets with mostly data, already-optimized files. The more images and graphics, the better compression results.
Format-specific notes: Microsoft Office formats (DOCX, XLSX, PPTX) - Best compression candidates due to common image embedding. OpenDocument (ODT, ODS, ODP) - Compress well, maintain compatibility with LibreOffice. PDF files - Results vary widely based on original optimization. Legacy formats (DOC, XLS, PPT) - Good compression plus benefits of modernization. All formats maintain full functionality after compression - you get smaller files that work exactly the same.
How long does document compression take?
Compression speed varies by file: Small documents (under 1MB) - 1-3 seconds typically. Medium documents (1-5MB) - 3-10 seconds average. Large documents (5-10MB) - 10-30 seconds depending on content. Batch compression - 2-10 seconds per file processed in parallel. Actual time depends on: Original file size, number and size of embedded images, document complexity, current server load, your internet connection speed.
Speed optimization tips: Compress multiple files together (parallel processing is faster than sequential). Use Fast preset when speed matters most (processes quicker than Ultra). Ensure stable internet connection (faster uploads = faster overall time). Close unnecessary browser tabs (better performance). Compress during off-peak hours if doing large batches (less server congestion). Most users find compression times very acceptable - usually faster than downloading the original uncompressed file would have been!
What takes time: Uploading original file (depends on your internet speed), analyzing document content (quick), processing images and optimizations (main compression time), downloading compressed result (usually faster than upload). For context: Compressing a 5MB PowerPoint presentation typically takes 5-8 seconds total including upload/download. That same presentation might take 30 seconds to email uncompressed but only 10 seconds compressed - net time savings even with compression processing!
Is my document data secure and private?
Your privacy is our top priority: Encrypted transfer - All uploads and downloads use HTTPS encryption. Temporary processing - Documents processed on secure servers only as long as needed. Automatic deletion - All files permanently deleted within 1 hour after compression. No permanent storage - We never keep your documents. No third-party access - Your files never leave our system or get shared. No human access - Automated compression only, no manual viewing.
What we don't do: Store documents after processing, share files with anyone else, use your content for training or analysis, retain document metadata or content, keep any compression history, sell or monetize your data, require account registration (no email collection). What we do: Process your compression request, provide secure download link, delete all traces automatically, maintain strict server security, regularly update encryption protocols, comply with data protection regulations.
Security recommendations: For highly sensitive documents, consider: Using the service on trusted devices only, verifying HTTPS connection (padlock icon), deleting compressed files from Downloads folder after use, using company VPN if required by policy, checking if your organization allows cloud-based document processing. Our service is suitable for business and personal documents. For classified or extremely sensitive materials, consult your organization's data handling policies regarding online tools.
What happens to metadata when compressing?
Metadata handling options: Remove Metadata (enabled by default) - Strips author name, company name, edit history, revision tracking, comments and annotations, document properties, creation/modification dates, custom properties. Keep Metadata (disabled option) - Preserves all document information, maintains audit trail, keeps document history. Most users should remove metadata to maximize compression and privacy.
Why remove metadata: Privacy - Prevents leaking author identity, organization name, edit history. File size - Metadata can add 10-30% to file size (especially revision history). Clean documents - Removes confusing tracked changes, old comments. Distribution - Professional appearance without internal annotations. You can always keep one version with metadata for internal use and compress without metadata for external distribution.
Metadata in different formats: Word documents - Can contain extensive edit history, tracked changes, comments, author info. Excel spreadsheets - May include cell comments, change tracking, custom properties. PowerPoint - Often has speaker notes, hidden slides, reviewer comments. PDFs - Contain creation software, author, keywords, edit history. Remove metadata before sharing documents publicly, sending to clients, or posting online. Keep metadata for internal documents requiring audit trails.
Kann ich gescannte Dokumente oder Bild-PDFs komprimieren?
Ja, gescannte Dokumente lassen sich hervorragend komprimieren: Gescannte PDFs sind größtenteils Bilder und bieten maximales Kompressionspotenzial (typische Reduzierung von 60-80%). Hochauflösende Scans (300+ DPI) haben viel Spielraum für Kompression (können auf 150 DPI für das Web, 96 DPI für E-Mail reduziert werden). Dokumente, die nur aus Bildern bestehen, reagieren gut auf unsere Optimierung (oft die besten Kandidaten für die Kompression). Perfekt für: Gescannte Verträge, digitalisierte Archive, Fotoquittungen, gescannte Formulare, bildbasierte Bücher.
Tipps zur Kompression gescannter Dokumente: Verwenden Sie das Normal-Preset für allgemeine Scananforderungen (ausgewogenes Verhältnis von Qualität und Größe). Verwenden Sie Fast für Quittungen und einfache Scans (maximale Kompression, dennoch lesbar). Verwenden Sie Maximum für wichtige rechtliche Dokumente (Qualität beibehalten). Verwenden Sie Ultra für Scans, die Druckqualität benötigen (minimale Kompression). Berücksichtigen Sie Ihren Anwendungsfall: E-Mail-Anhang (verwenden Sie Fast), Webverteilung (verwenden Sie Normal), Archivierung (verwenden Sie Maximum), Druckreproduktion (verwenden Sie Ultra).
DPI-Empfehlungen für Scans: E-Mail/Web-Anzeige - 72-96 DPI ausreichend (Fast/Normal-Preset), Bildschirme profitieren nicht von höherer Auflösung. Bürodokumente - 96-150 DPI ideal (Normal/Maximum-Preset), gutes Gleichgewicht für Druck oder Anzeige. Rechtliche/archivierte Dokumente - 150-300 DPI empfohlen (Maximum/Ultra-Preset), erhält Details für die Reproduktion. Originalscans sind oft 300-600 DPI (viel höher als benötigt), die Reduzierung auf die angemessene DPI kann 70-90% der Dateigröße einsparen, ohne sichtbaren Qualitätsverlust für den vorgesehenen Gebrauch.
Welche DPI-Einstellung sollte ich wählen?
DPI (Dots Per Inch) bestimmt die Bildauflösung: 72 DPI (Fast-Preset) - Kleinste Dateien, Webansicht, E-Mail-Anhänge, nur für Bildschirmnutzung. Dateigrößeneinsparungen: 70-80%. Am besten für: Schnelle Freigaben, temporäre Dokumente, E-Mails, bei denen die Größenbeschränkungen eng sind. 96 DPI (Normal-Preset) - Ausgewogene Qualität, allgemeine Dokumente, angenehme Bildschirmansicht, gelegentliches Drucken. Dateigrößeneinsparungen: 50-60%. Am besten für: Die meisten Alltagsdokumente, Berichte, Präsentationen, Web-Downloads.
Höhere Qualitätsoptionen: 150 DPI (Maximum-Preset) - Bessere Qualität, gut für Druck, wichtige Dokumente, professionelle Freigabe. Dateigrößeneinsparungen: 30-40%. Am besten für: Kundenorientierte Dokumente, wichtige Berichte, Dokumente, die Sie drucken möchten. 300 DPI (Ultra-Preset) - Minimale Kompression, Druckqualität, Archivierungsbedürfnisse, kritische Dokumente. Dateigrößeneinsparungen: 10-20%. Am besten für: Dokumente, die für den professionellen Druck bestimmt sind, Archivspeicher, wenn Qualität von größter Bedeutung ist.
Die richtige DPI wählen: Berücksichtigen Sie den Endgebrauch - Anzeige auf dem Bildschirm? 72-96 DPI ist ausreichend. Gelegentliches Drucken? 96-150 DPI funktioniert gut. Professioneller Druck? 150-300 DPI erforderlich. Passen Sie die Qualität an den Bedarf an - Verwenden Sie keine 300 DPI für E-Mail-Anhänge (verschwendete Bandbreite). Verwenden Sie keine 72 DPI für Dokumente, die Sie drucken möchten (schlechte Qualität). Beginnen Sie mit Normal (96 DPI) - Funktioniert für 80% der Anwendungsfälle. Passen Sie nach oben oder unten basierend auf spezifischen Bedürfnissen an. Denken Sie daran: Das menschliche Auge kann die Auflösung über einen bestimmten Punkt auf Bildschirmen nicht unterscheiden - höher ist nicht immer besser, sondern nur größere Dateien!