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Professional HDR file converter tool
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Supported Formats
Convert between all major file formats with high quality
Web Formats
Joint Photographic Experts Group - the most universal image format for photographs using lossy compression. Reduces file sizes 90-95% with minimal visible quality loss. No transparency support. Perfect for photos, web images, email attachments, and any scenario requiring small file sizes. Adjustable quality levels from 1-100. Standard since 1992 with universal device and software support. Ideal for photographs and complex images with many colors.
Portable Network Graphics - lossless image format supporting transparency and 16 million colors. Larger files than JPEG but perfect quality preservation. Supports alpha channel for smooth transparency. Excellent for logos, graphics with text, screenshots, and images requiring transparency. Better compression than GIF for photos. Perfect for web graphics, UI elements, and any image needing lossless quality or transparency. Standard format for web graphics since 1996.
Web Picture format - modern image format by Google providing 25-35% smaller files than JPEG at equivalent quality. Supports both lossy and lossless compression plus transparency. Superior compression algorithms reducing bandwidth usage. Native browser support (96%+ coverage). Perfect for website optimization, web images, and reducing page load times. Combines best features of JPEG, PNG, and GIF. Recommended for modern web development.
Graphics Interchange Format - image format supporting animation and transparency with 256-color limitation. Small file sizes for simple images. Perfect for simple animations, emojis, memes, and graphics with few colors. Lossless for limited palette. Inefficient for photographs (use JPEG) or high-color graphics (use PNG). Universal support since 1987. Standard format for simple web animations and reaction images.
Scalable Vector Graphics - XML-based vector format rendering perfectly at any size. Infinitely scalable without quality loss or pixelation. Small file sizes for geometric shapes and illustrations. Editable with text editors and design software. Perfect for logos, icons, diagrams, and graphics requiring scaling. Supports animation and interactivity. Standard for responsive web graphics and resolution-independent designs. Essential format for modern web icons.
Icon File Format - specialized format for Windows icons containing multiple image sizes (16x16 to 256x256 pixels). Single file provides icons for all display resolutions. Used for favicons, application icons, and Windows shell icons. Supports transparency and multiple color depths. Perfect for website favicons, Windows program icons, and shortcut icons. Standard format for Windows icons since Windows 1.0. Essential for professional Windows applications.
AV1 Image File Format - next-generation image format based on AV1 video codec providing better compression than WebP and JPEG. 20-50% smaller files at equivalent quality. Supports HDR, wide color gamut, and transparency. Cutting-edge compression technology. Growing browser support (85%+ and increasing). Perfect for future-proof web images and maximum efficiency. Better quality at smaller sizes than any previous format. Recommended for modern websites prioritizing performance.
Bitmap Image File - uncompressed raster format from Microsoft providing pixel-perfect quality with large file sizes. No compression means huge files (1MB+ for screenshots). Fast to load and display. Simple format with universal Windows support. Perfect for temporary graphics, screen captures, and scenarios where compression artifacts are unacceptable. Legacy format largely replaced by PNG. Convert to PNG or JPEG for practical use and storage.
Tagged Image File Format - flexible format supporting multiple pages, layers, and various compression methods. Industry standard for professional photography, publishing, and archival. Supports lossless compression, 16-bit color depth, and extensive metadata. Large file sizes but excellent quality. Perfect for print publishing, photo archival, professional photography, and scenarios requiring maximum quality and flexibility. Used in medical imaging and professional scanning.
Professional Formats
Photoshop Document - Adobe Photoshop's native format preserving layers, effects, masks, and all editing capabilities. Supports 16-bit and 32-bit color depths for professional work. Large file sizes due to layer data and editing information. Perfect for ongoing design projects, professional photo editing, and collaborative design work. Not suitable for final output (export to JPEG/PNG). Essential format for professional graphic design and photo manipulation workflows. Industry standard for design files.
OpenEXR - high dynamic range image format developed by Industrial Light & Magic for visual effects and animation. Stores 16-bit or 32-bit floating-point values per channel enabling enormous dynamic range. Supports multiple layers, arbitrary channels, and lossless/lossy compression. Industry standard for VFX, CGI, and professional 3D rendering. Perfect for HDR photography, compositing, and scenarios requiring maximum color precision. Used extensively in film production and high-end visual effects.
High Dynamic Range Image - format storing luminance and color information with greater range than standard images. Captures and displays brightness levels impossible in JPEG/PNG. Uses 32-bit floating-point encoding. Perfect for realistic lighting in 3D rendering, environment maps, and HDR photography. Common in game development and architectural visualization. Enables realistic tone mapping and exposure adjustment. Essential for professional lighting workflows.
DirectDraw Surface - Microsoft texture format for games and 3D applications supporting compressed textures and mipmaps. Optimized for GPU loading with hardware-accelerated decompression. Stores multiple resolution levels (mipmaps) in single file. Standard format for game textures (DirectX, Unity, Unreal). Supports various compression algorithms (DXT1, DXT5, BC7). Perfect for game development, 3D modeling, and real-time rendering. Essential format for game asset pipelines.
Truevision TGA/Targa - raster graphics format supporting 8-32 bits per pixel with alpha channel. Uncompressed or RLE compressed for fast loading. Standard format for video editing, animation, and texture mapping. Excellent color accuracy with optional lossless compression. Perfect for video frame sequences, animation frames, and game textures. Widely supported in 3D software and video editing applications. Reliable format for professional media production.
JPEG 2000 - advanced image format using wavelet compression providing better quality than JPEG at equivalent file sizes. Supports lossless and lossy compression, progressive decoding, and ROI coding. Used in medical imaging, digital cinema, and archival. Better compression artifacts than JPEG. Slower encoding/decoding. Perfect for medical imaging, digital preservation, and applications requiring superior compression. Limited web browser support.
JPEG Stereo - stereoscopic 3D image format storing left and right eye views side-by-side or top-bottom. Based on standard JPEG with special arrangement for 3D viewing. Used for 3D photography, VR content, and stereoscopic displays. Compatible with 3D TVs and VR headsets. Perfect for 3D photography, stereoscopic content creation, and VR/AR applications. Requires special viewing equipment for proper 3D effect.
Portable Float Map - floating-point image format storing HDR color data. Simple format with 32-bit float values per channel. Used in computer graphics for HDR images and height maps. Uncompressed format with large file sizes. Perfect for HDR photography processing, displacement maps, and scientific imaging. Common in 3D rendering and simulation applications. Alternative to OpenEXR for simple HDR storage.
Flexible Image Transport System - scientific image format used primarily in astronomy. Stores astronomical images with extensive metadata headers. Supports multiple data arrays and tables. Standard format for astronomical data archives. Perfect for astronomical imaging, scientific data exchange, and research applications. Used by major observatories and space agencies worldwide. Essential format for astronomical research and data sharing.
How to Convert Files
Upload your files, select output format, and download converted files instantly. Our converter supports batch conversion and maintains high quality.
Frequently Asked Questions
Why is the HDR (.hdr) image format widely used in 3D graphics and lighting?
HDR images store real-world lighting intensity using high dynamic range values that far exceed the limitations of standard 8-bit formats like JPG or PNG. Instead of clipping highlights or compressing shadows, HDR files preserve full luminance values, enabling physically accurate reflections, environment lighting, and realistic shading in 3D rendering, game engines, and VFX pipelines.
The Radiance HDR format uses a compact RGBE encoding, where each pixel stores red, green, blue, and a shared exponent. This allows the image to represent extremely bright light sources, making it ideal for skyboxes, environment maps, and global illumination workflows.
How does the HDR format store lighting information differently from normal images?
HDR is engineered for physical light accuracy rather than display-ready visuals:
RGBE Floating-Point Encoding
HDR files store each pixel with three color channels plus an exponent, enabling representation of very high brightness values that standard formats cannot store.
Real Luminance Preservation
HDR stores scene-referred light intensities, meaning the raw brightness of a sun, lamp, or sky is recorded instead of being tone-mapped.
Linear Light Data
HDR images are stored in linear color space, making them ideal for physically-based rendering, energy-conserving shaders, and unbiased lighting.
High Dynamic Range
HDR captures detail from deep shadows to extremely bright highlights with no clipping, unlike SDR formats that compress or lose detail.
These characteristics make HDR uniquely suited for environment lighting and CGI workflows.
Where is the HDR (.hdr) format commonly used?
HDR is essential in many 3D and high-end imaging pipelines:
Environment Lighting for 3D Rendering
Render engines use HDR environment maps to provide realistic reflections, global illumination, and physically-based lighting.
Image-Based Lighting (IBL)
HDR panoramas captured with bracketed exposures are used to light CGI scenes with real-world accuracy.
Game Development
HDR images are used in skyboxes or as probes for realistic environment reflections.
VFX and Compositing
HDR files capture on-set lighting for integrating CGI elements into real footage.
Panoramas for AR/VR
HDR environments are used in VR to achieve physically correct lighting and immersion.
Scientific and Industrial Imaging
HDR supports precise brightness measurement, useful in research and simulation.
HDR Photography Storage
Some photography tools export radiance maps for tone mapping and exposure fusion.
HDR is used anywhere high-fidelity lighting data is necessary.
Why do HDR files sometimes appear washed out or too bright?
HDR stores linear light values, but most image viewers expect gamma-corrected sRGB. Without proper tone mapping, the image appears flat or overexposed.
Viewers that ignore the RGBE exponent may incorrectly clamp or misinterpret brightness values.
Some applications do not apply exposure adjustments, causing HDR files to display incorrectly by default.
Can HDR replace PNG, JPG, WebP, or EXR?
HDR cannot replace consumer formats because it is not designed for display-it is meant for lighting and CGI, not regular photography.
HDR is less advanced than EXR; it supports HDR values but lacks multi-channel, deep data, or 32-bit full-float detail.
PNG and JPG remain necessary for final output, while HDR is suited only for raw lighting information.
Is HDR good for screenshots, UI elements, or normal graphics?
No-HDR is not designed for pixel-precise images or UI graphics, and results in unnecessarily large files.
HDR uses linear-space floating data, making colors and edges look incorrect when viewed without tone mapping.
PNG and JPG are more appropriate for graphics and display purposes.
Why do some apps fail to open or correctly decode HDR files?
Some software does not support Radiance RGBE encoding or expects EXR instead.
HDR files require linear-to-display transformations that many lightweight viewers do not apply.
Large HDR panoramas (8k–16k) require substantial memory, causing failures in weaker systems.
Why do HDR colors shift between applications?
Color interpretation differences lead to mismatches:
Missing Tone Mapping
Software that fails to apply tone mapping will display HDR files incorrectly.
Linear vs Gamma Misinterpretation
HDR images are stored linearly; sRGB viewers assume gamma-corrected images, causing contrast and brightness issues.
White Balance Variations
Bracketed HDR sources may have camera white balance inconsistencies that become visible in the final map.
Incorrect Exposure Handling
If the viewer does not allow exposure adjustment, highlights may appear clipped or unbalanced.
Lack of ICC Profiles
HDR files rarely include embedded color profiles, leading to interpretation differences.
Proper HDR preview requires tone mapping and correct linear-gamma conversions.
How does HDR compare to EXR, TIFF, PNG, and JPG?
EXR far surpasses HDR in flexibility, supporting multi-channel data, deep pixels, and floating-point precision.
PNG and JPG are optimized for display, while HDR is optimized for storing lighting data for 3D rendering.
TIFF can store HDR information but is more storage-heavy and less efficient for environment lighting.
What formats should I use instead of HDR depending on purpose?
Different workflows benefit from different formats:
For Web and Display
Use JPG, PNG, WebP, or AVIF instead of HDR, since browsers do not display HDR radiance maps correctly.
For VFX and 3D Rendering
EXR is preferred for multi-layered and high-precision render passes.
For Regular Photography
Use HEIC, JPG, or RAW depending on quality needs; HDR is not suitable for conventional images.
For Editing Pipelines
RAW/DNG should be used for photography; HDR is better for synthetic lighting maps.
For Unix Tools
PPM, PNG, or TIFF integrate better with CLI-based workflows.
For Lightweight Transfer
JPG or WebP are significantly smaller and more widely supported.
For Older Software
BMP, PNG, or TIFF may be required when HDR decoding is unavailable.
For Physically Accurate Lighting
HDR or EXR are required depending on whether single-channel radiance or multi-pass data is needed.
For Documents
HDR is not suitable; TIFF G3/G4 remains the industry standard.
For Older Hardware
Use JPG or PNG, as HDR decoding is rarely supported on older systems.
Does HDR support transparency, multi-layer data, or deep pixels?
HDR does not support transparency; all pixels contain RGBE values only.
HDR does not support multiple layers or render passes; EXR is required for that functionality.
HDR does not support deep pixels-volumetric and multi-depth workflows require EXR.
How can I reduce HDR file size?
Reduce resolution of panorama maps; HDR files scale heavily with image size.
Convert HDR to compressed EXR (PIZ or B44A) for lower file sizes with high retained fidelity.
Remove unnecessary background data or crop unused areas from environment maps.
Why do some HDR exports appear soft or lack detail?
Exposure or tone mapping may compress contrast, making details appear muted.
HDR is commonly derived from bracketed photos; poor alignment or ghosting can soften results.
Converting HDR to display formats can reduce sharpness due to different gamma curves.
Why is HDR slow to load or process?
Large HDR panoramas (8K–16K) require extensive decompression and memory usage.
Floating-point or exponent data slows down CPU operations during preview or mapping.
Programs performing real-time tone mapping require additional processing overhead.
Why is the HDR (.hdr) format still used today despite newer formats like EXR?
HDR files are simple, lightweight for floating-point imaging, and easy to generate from bracketed exposures.
They remain widely used in rendering engines for environment lighting, skyboxes, and reflection probes.
HDR provides a good balance between precision, compatibility, and efficiency, making it a lasting standard for lighting workflows.
About the HDR Format
HDR is a file format used in specific workflows. The exact characteristics depend on the implementation and chosen settings.
- Format Type
- File format
- Origin
- Industry-developed format
- Common Uses
- Various applications that support HDR
- Compression
- Depends on implementation
Sources and References
Format details on this page are based on the official specifications and documentation below.
- Image file type and format guide- MDN Web Docs