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支持的格式
以高质量在所有主要文件格式之间转换
常见格式
MPEG-1音频层III - 全球最通用的音频格式，使用有损压缩将文件大小减少90%，同时保持出色的感知质量。非常适合音乐库、播客、便携设备以及任何需要广泛兼容性的场景。支持32-320kbps的比特率。自1993年以来成为数字音乐的标准，几乎可以在每个设备和平台上播放。
Waveform Audio File Format - uncompressed PCM audio providing perfect quality preservation. Standard Windows audio format with universal compatibility. Large file sizes (10MB per minute of stereo CD-quality). Perfect for audio production, professional recording, mastering, and situations requiring zero quality loss. Supports various bit depths (16, 24, 32-bit) and sample rates. Industry standard for professional audio work.
Ogg Vorbis - 开源有损音频编码器，提供与MP3/AAC相当的质量，且比特率相似。无专利和许可限制。与MP3在相同质量下文件大小更小。用于游戏、开源软件和流媒体。支持可变比特率（VBR），以获得最佳质量。非常适合需要免费编码器和良好质量的应用。媒体播放器和平台的支持不断增加。
Advanced Audio Coding - successor to MP3 offering better quality at same bitrate (or same quality at lower bitrate). Standard audio codec for Apple devices, YouTube, and many streaming services. Supports up to 48 channels and 96kHz sample rate. Improved frequency response and handling of complex audio. Perfect for iTunes, iOS devices, video streaming, and modern audio applications. Part of MPEG-4 standard widely supported across platforms.
无损音频压缩编码器 - 在不损失任何质量的情况下压缩音频40-60%。完美保留原始音频的逐位精度。开放源代码格式，无专利或许可费用。支持高分辨率音频（192kHz/24-bit）。非常适合归档音乐收藏、音响爱好者听音和质量至关重要的场景。广泛支持媒体播放器和流媒体服务。质量与文件大小之间的理想平衡。
MPEG-4 Audio - AAC or ALAC audio in MP4 container. Standard audio format for Apple ecosystem (iTunes, iPhone, iPad). Supports both lossy (AAC) and lossless (ALAC) compression. Better quality than MP3 at same file size. Includes metadata support for artwork, lyrics, and rich tags. Perfect for iTunes library, iOS devices, and Apple software. Widely compatible across platforms despite Apple association. Common format for purchased music and audiobooks.
Windows Media Audio - Microsoft's proprietary audio codec with good compression and quality. Standard Windows audio format with native OS support. Supports DRM for protected content. Various profiles (WMA Standard, WMA Pro, WMA Lossless). Comparable quality to AAC at similar bitrates. Perfect for Windows ecosystem and legacy Windows Media Player. Being superseded by AAC and other formats. Still encountered in Windows-centric environments and older audio collections.
无损格式
Apple Lossless Audio Codec - Apple's lossless compression reducing file size 40-60% with zero quality loss. Perfect preservation of original audio like FLAC but in Apple ecosystem. Standard lossless format for iTunes and iOS. Supports high-resolution audio up to 384kHz/32-bit. Smaller than uncompressed but larger than lossy formats. Perfect for iTunes library, audiophile iOS listening, and maintaining perfect quality in Apple ecosystem. Comparable to FLAC but with better Apple integration.
Monkey's Audio - 高效的无损压缩，达到比FLAC更好的压缩比（通常为原始文件的55-60%）。完美保留质量，零损失。免费格式，开放规范。压缩/解压缩速度比FLAC慢。受到音响爱好者社区的欢迎。与FLAC相比，播放器支持有限。非常适合在最大空间节省的情况下进行归档，同时保持完美质量。最适合存储空间至关重要而处理速度不重要的场景。
WavPack - hybrid lossless/lossy audio codec with unique correction file feature. Can create lossy file with separate correction file for lossless reconstruction. Excellent compression efficiency. Perfect for flexible audio archiving. Less common than FLAC. Supports high-resolution audio and DSD. Convert to FLAC for universal compatibility.
True Audio - lossless audio compression with fast encoding/decoding. Similar compression to FLAC with simpler algorithm. Open-source and free format. Perfect quality preservation. Less common than FLAC with limited player support. Perfect for audio archiving when FLAC compatibility not required. Convert to FLAC for broader compatibility.
Audio Interchange File Format - Apple's uncompressed audio format, equivalent to WAV but for Mac. Stores PCM audio with perfect quality. Standard audio format for macOS and professional Mac audio applications. Supports metadata tags better than WAV. Large file sizes like WAV (10MB per minute). Perfect for Mac-based audio production, professional recording, and scenarios requiring uncompressed audio on Apple platforms. Interchangeable with WAV for most purposes.
现代格式
Opus音频编码器 - 现代开源编码器（2012年）在6kbps到510kbps的所有比特率下提供最佳质量。对语音和音乐表现出色。现代编码器中延迟最低，非常适合VoIP和实时通信。在相同比特率下优于MP3、AAC和Vorbis。被WhatsApp、Discord和WebRTC使用。非常适合流媒体、语音通话、播客和音乐。正在成为互联网音频的通用音频编码器。
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Matroska Audio - audio-only Matroska container supporting any audio codec. Flexible format with metadata support. Can contain multiple audio tracks. Perfect for audio albums with chapters and metadata. Part of Matroska multimedia framework. Used for audiobooks and multi-track audio. Convert to FLAC or MP3 for universal compatibility.
遗留格式
MPEG-1音频层II - MP3的前身，用于广播和DVD。在高比特率下质量优于MP3。DVB（数字电视）和DVD-Video的标准音频编码器。压缩效率低于MP3。非常适合广播应用和DVD制作。作为遗留格式正在被AAC取代，仍在数字电视和视频制作工作流程中遇到。
Dolby Digital (AC-3) - surround sound audio codec for DVD, Blu-ray, and digital broadcasting. Supports up to 5.1 channels. Standard audio format for DVDs and HDTV. Good compression with multichannel support. Perfect for home theater and video production. Used in cinema and broadcast. Requires Dolby license for encoding.
Adaptive Multi-Rate - speech codec optimized for mobile voice calls. Excellent voice quality at very low bitrates (4.75-12.2 kbps). Standard for GSM and 3G phone calls. Designed specifically for speech, not music. Perfect for voice recordings, voicemail, and speech applications. Used in WhatsApp voice messages and mobile voice recording. Efficient for voice but inadequate for music.
Sun/NeXT Audio - simple audio format from Sun Microsystems and NeXT Computer. Uncompressed or μ-law/A-law compressed audio. Common on Unix systems. Simple header with audio data. Perfect for Unix audio applications and legacy system compatibility. Found in system sounds and Unix audio files. Convert to WAV or MP3 for modern use.
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RealAudio - legacy streaming audio format from RealNetworks (1990s-2000s). Pioneered internet audio streaming with low-bitrate compression. Obsolete format replaced by modern streaming technologies. Poor quality by today's standards. Convert to MP3 or AAC for modern use. Historical importance in early internet audio streaming.
专业格式
DTS Coherent Acoustics - surround sound codec competing with Dolby Digital. Higher bitrates than AC-3 with potentially better quality. Used in DVD, Blu-ray, and cinema. Supports up to 7.1 channels and object-based audio. Perfect for high-quality home theater. Premium audio format for video distribution. Convert to AC-3 or AAC for broader compatibility.
Core Audio Format - Apple's container for audio data on iOS and macOS. Supports any audio codec and unlimited file sizes. Modern replacement for AIFF on Apple platforms. Perfect for iOS app development and professional Mac audio. No size limitations (unlike WAV). Can store multiple audio streams. Convert to M4A or MP3 for broader compatibility outside Apple ecosystem.
VOC (Creative Voice File) - audio format from Creative Labs Sound Blaster cards. Popular in DOS era (1989-1995) for games and multimedia. Supports multiple compression formats and blocks. Legacy PC audio format. Common in retro gaming. Convert to WAV or MP3 for modern use. Important for DOS game audio preservation.
Speex - open-source speech codec designed for VoIP and internet audio streaming. Variable bitrate from 2-44 kbps. Optimized for speech with low latency. Better than MP3 for voice at low bitrates. Being superseded by Opus. Perfect for voice chat, VoIP, and speech podcasts. Legacy format replaced by Opus in modern applications.
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如何转换文件
上传您的文件，选择输出格式，立即下载转换后的文件。我们的转换器支持批量转换并保持高质量。
常见问题
什么是 ALAC，它与 FLAC 有何比较？
ALAC (Apple Lossless Audio Codec) is Apple's lossless compression format from 2004, basically Apple's answer to FLAC. Both compress audio without losing any quality - perfect archival formats. ALAC gives you 40-60% size reduction vs uncompressed files while preserving bit-perfect audio. It's like ZIP for music, except the decompression happens in real-time during playback.
ALAC vs FLAC comparison: FLAC compresses slightly better (usually 5-10% smaller files). FLAC has more advanced features (better error checking, metadata handling). But ALAC has one huge advantage - native Apple support. iPhone, iPad, Mac, iTunes play ALAC perfectly out of the box. FLAC requires third-party apps on Apple devices.
为什么我应该将 FLAC 转换为 ALAC？
Convert FLAC to ALAC for these Apple-specific benefits:
Native iOS Support
ALAC 可以直接在 iPhone 音乐应用中播放，无需第三方软件。FLAC 需要 VLC 或其他应用。原生 = 方便。
iTunes 集成
ALAC files import seamlessly to iTunes/Music app. Album art, playlists, smart features all work. FLAC is second-class citizen in Apple ecosystem.
HomePod 兼容性
HomePod and AirPlay support ALAC lossless streaming. FLAC doesn't work with Apple smart speakers. Streaming high quality needs ALAC.
Mac 原生解码
macOS 包含硬件加速的 ALAC 解码。在 MacBook 上更好地节省电池寿命。FLAC 需要软件解码（更多 CPU 使用）。
If you use Apple products extensively, converting FLAC library to ALAC makes everything work smoother. No quality loss converting between lossless formats.
转换为 ALAC 会损失质量吗？
ALAC 的质量取决于源：
来自无损（FLAC/WAV/AIFF）
零质量损失。位完美转换。ALAC 保留每一位原始音频数据。数学上相同的音频。
来自有损（MP3/AAC/OGG）
没有质量提升！有损文件保持有损质量。ALAC 封装不会恢复丢失的数据。将 MP3 转换为 ALAC 只是浪费空间。
来自 CD 抓取
如果抓取正确，质量完美。ALAC 捕获完整的 CD 音频。是物理介质数字化的优秀档案格式。
来自高分辨率音频
ALAC 支持 24 位/192kHz 及更高。完美保留高分辨率音频。没有分辨率限制。
质量验证
使用音频分析工具（spek、Audacity）验证无损转换。波形在转换前后应完全匹配。
转换规则
无损到无损 = 完美。有损到 ALAC = 无意义的浪费。始终从最佳可用源转换。
Apple's Implementation
ALAC encoder/decoder is open-source and well-tested. Apple's implementation is reliable and preserves quality perfectly.
ALAC 是真正的无损格式。从无损源转换保留完美质量。从有损源转换不会改善任何东西。
ALAC 比 320kbps MP3 更好吗？
绝对是从质量的角度来看！ALAC 是无损的 - 它保留 100% 的原始音频数据。320kbps MP3 为了实现压缩丢弃了大量音频信息。对于耳朵敏感的人和高端设备，差异是可以听到的（更好的瞬态，更宽的声场，没有高频衰减）。对于大多数消费者设备上的听众，差异是微妙的或不可察觉的。
Trade-offs: ALAC files are 5-6x larger than 320kbps MP3 (about 300-600MB per album vs 100MB). ALAC drains battery faster (decompression requires CPU). ALAC doesn't work on all devices (Apple-centric). MP3 works absolutely everywhere. So ALAC is better quality but less convenient.
何时使用 ALAC：在 Mac/iPhone 上的家庭库中有大量存储。使用良好的耳机/扬声器进行关键听音。您将来会编辑的档案母带。何时使用 MP3：设备存储有限（64GB 的手机），主要使用耳塞/便携式扬声器，重视便利而非完美，想要更小的备份。许多人在家中保留 ALAC，转换为 MP3/AAC 用于便携设备。
Can Android phones play ALAC files?
Android doesn't support ALAC natively - it's Apple's proprietary format. Google favors open standards (FLAC) and universal formats (MP3). You can install third-party music players that support ALAC (VLC, Poweramp, Neutron) but it's not built into Android OS. Playback works but isn't as smooth as native formats.
Better solution: Use FLAC on Android. FLAC has native Android support, same lossless quality as ALAC, often compresses 5-10% better. Converting ALAC to FLAC is bit-perfect (no quality loss). If you have mixed ecosystem (iPhone + Android tablet, or switching phones), consider FLAC as your lossless format.
Ecosystem reality: ALAC = Apple world. FLAC = everywhere else. Choose your lossless format based on primary devices. If you're committed to Apple ecosystem, ALAC makes sense. If you use multiple platforms or might switch, FLAC is safer long-term investment.
ALAC 与 WAV 相比节省了多少空间？
ALAC 通常实现与未压缩 WAV 相比 40-60% 的大小减少。因此，10MB/分钟的 WAV 变为 4-6MB/分钟的 ALAC。确切的压缩取决于音频内容：简单的古典音乐压缩效果更好（60% 减少），复杂的重金属压缩效果较差（40% 减少）。但总是会有显著的空间节省。
数学示例：1000 首歌曲的 WAV 库 = ~4GB。同样的库在 ALAC 中 = ~2GB。您节省了 2GB（50%），同时保持完美的音频质量。对于大型音乐收藏，节省显著增加。您的 iPhone/Mac 可以容纳更多音乐，而不牺牲质量。
Compare to lossy: 320kbps MP3 would be ~400MB (90% smaller than WAV). AAC 256kbps ~300MB. So ALAC sits between uncompressed and lossy - significant space savings (50%) while maintaining perfect quality. Great middle ground for Apple users with decent storage capacity.
我应该将我的 CD 收藏抓取为 ALAC 还是 AAC？
如果您有大量存储（500GB+ 可用），希望完美的 CD 质量以备未来使用，拥有良好的音频设备，计划进行音频编辑，不希望有代际损失，则选择 ALAC。ALAC 保留了 CD 的所有内容 - 您可以随时转换为 AAC，而无需再次使用 CD。
如果存储有限（64GB 的手机），主要使用耳塞/便携式扬声器，重视便利而非完美，想要更小的备份，则选择 AAC。AAC 256kbps 听起来很棒（对大多数听众来说是透明的），文件大小是 ALAC 的 5-6 倍。对于休闲听音，AAC 是实用的选择。
最佳方法：将 ALAC 抓取为母档案（外部驱动器或 NAS）。为 iPhone/便携式使用创建 AAC 副本。为档案保留无损母带，同时为日常听音提供高效副本。存储便宜 - 在母带中保留质量，在便携副本中优化便利性。
ALAC 的技术规格是什么？
ALAC 格式的关键规格：
压缩类型
无损（比特完美）。使用线性预测和瑞士编码。解压缩速度快（手机上实时播放）。
支持的采样率
8kHz 到 384kHz。常见：44.1kHz（CD），48kHz（视频），96/192kHz（高分辨率）。灵活的标准。
位深
16位（CD质量），24位（高分辨率），32位。所有常见位深均支持无损编码。
文件大小
40-60% 的未压缩大小。44.1kHz/16位 ALAC = ~4-6MB 每分钟（对比 10MB WAV）。压缩比因内容而异。
容器
通常存储在 .m4a 容器中（MP4 音频）。与 AAC 使用相同的容器，但编解码器不同。扩展名并不表示无损/有损。
ALAC 在压缩效率与快速解码之间取得平衡。设计用于移动设备，因此 CPU 效率优先于最大压缩。
我可以在不损失更多质量的情况下将 ALAC 转换为 AAC 吗？
是的，将 ALAC 转换为 AAC 是干净的生成 - 您是从无损源编码到有损，而不是重新压缩已经有损的音频。从 ALAC（完美质量）开始意味着 AAC 编码器可以使用完整的音频数据。结果是所选比特率的最佳 AAC 质量。
这正是为什么保留无损母带（ALAC/FLAC）是明智的！您可以随时创建新的有损版本，而不会造成质量堆叠。从 ALAC 转换为 iPhone 的 AAC 256kbps，或为较小设备转换为 AAC 128kbps，或为网络流媒体转换为 Opus - 所有这些都来自同一无损源。每次转换都是其比特率的最佳质量。
避免这样做：绝不要将 AAC 转换为 MP3 或将 MP3 转换为 AAC（有损到有损 = 质量堆叠）。始终保留无损母带，并从母带新编码有损格式。此工作流程在您的音频生态系统中保持质量，而无需复杂的格式转换。
为什么 ALAC 不如 FLAC 流行？
FLAC 在无损领域占据主导地位有几个原因：
早期发布
FLAC 于 2001 年推出，ALAC 于 2004 年推出。FLAC 提前 3 年建立生态系统和采用。先发优势。
开源与专有
FLAC 一直是开源的。ALAC 在 2011 年之前是专有的。开源格式获得更广泛的软件支持更快。
更好的压缩
FLAC 的压缩效率比 ALAC 高 5-10%。对于大型收藏，FLAC 显著节省空间。
平台中立性
FLAC isn't tied to any ecosystem. ALAC is Apple-centric. Platform-neutral formats get broader adoption.
Linux/Unix Standard
FLAC became standard lossless format on Linux. Android adopted it. ALAC remained Apple-only for years.
元数据优势
FLAC 具有更优越的标签系统（Vorbis 注释）。ALAC 使用 MP4 标签（更有限）。对于大型库很重要。
社区支持
开源的 FLAC 拥有庞大的社区开发工具、库和播放器。ALAC 生态系统较小。
更广泛的硬件支持
音响设备、网络播放器、DAC 通用支持 FLAC。ALAC 支持较少见。
Apple's Priorities
Apple never pushed ALAC hard. They prefer AAC (smaller, good enough). ALAC is niche even in Apple world.
网络/流媒体
网络音频不支持 ALAC（没有浏览器实现）。FLAC 有一些网络支持。ALAC 是仅下载格式。
Does Apple Music support ALAC streaming?
Yes! Apple Music introduced lossless streaming in June 2021, using ALAC codec. Subscribers get lossless (up to 24-bit/48kHz) at no extra cost, and hi-res lossless (up to 24-bit/192kHz) for supported devices. It's ALAC streaming, same codec used in your downloaded files. Finally brings lossless to mainstream streaming.
Requirements: Need Apple Music subscription (not just iTunes Match). Works on iPhone, iPad, Mac, Apple TV, Android. Doesn't work on HomePod (limited to 256kbps AAC) or AirPods (Bluetooth limitations). Requires decent internet (lossless uses 6x more data than AAC). Enable in Settings > Music > Audio Quality.
实际情况：大多数人不会在使用蓝牙耳机的移动设备上听到 AAC 256kbps 和无损之间的区别。无损在有线耳机、优质扬声器或关键听音时表现出色。虽然有这个选择很好，但对于休闲流媒体，AAC 的质量已经非常优秀。ALAC 流媒体是为音响爱好者和安慰剂效应！
我可以编辑 ALAC 文件，还是需要先转换？
Professional audio software (Logic Pro, Adobe Audition, Audacity) can import ALAC and edit directly - software decodes ALAC to PCM for processing, then re-encodes output. However, most pros prefer editing in uncompressed formats (AIFF/WAV) for maximum compatibility and zero decode overhead. Convert ALAC to WAV for editing, then back to ALAC for storage.
为什么选择未压缩格式进行编辑：处理速度更快（无需解压缩），通用 DAW 兼容性，没有潜在的解码伪影影响编辑。ALAC 设计用于播放/存储，而非制作工作流程。未压缩格式是音频制作的行业标准，原因充分。
推荐的工作流程：保留 ALAC 母带用于归档存储。在编辑时，转换为 WAV/AIFF（无损转换）。以未压缩格式进行编辑。将最终结果导出为 ALAC 以便存储，AAC 以便分发。此工作流程确保在整个制作过程中保持质量，同时优化存储效率。
.m4a 是 ALAC 还是 AAC？
Both! .m4a is just a container (MP4 audio container), not a codec indicator. Files with .m4a extension can contain either AAC (lossy) or ALAC (lossless) audio. You can't tell from filename alone - need to check file properties. Right-click > Get Info (Mac) or Properties (Windows) to see codec.
这让人们感到困惑。iTunes/Music 应用程序使用 .m4a 来表示 AAC 购买（有损）和 ALAC 播放（无损）。相同的扩展名，完全不同的压缩和质量。ALAC .m4a 文件的大小是 AAC .m4a 文件的 5-6 倍 - 文件大小通常是明显的标志。
整理您的库：许多人将 ALAC 文件重命名为文件名中包含 'ALAC' 或分成文件夹（'Music/ALAC' 与 'Music/AAC'）。有助于在管理混合库时避免混淆。媒体播放器在元数据中显示编解码器，但仅凭文件名无法指示无损与有损。
我应该将我的库从 FLAC 切换到 ALAC 吗？
Only if you're primarily Apple ecosystem user and want native support advantages. Converting FLAC to ALAC is lossless (no quality change) but takes time for large libraries. Benefits: native iOS/Mac playback, iTunes integration, HomePod support, hardware-accelerated decoding on Apple devices.
Keep FLAC if: you use mixed devices (Android + iPhone), value open-source formats, want slightly better compression, use Linux, have audiophile equipment (FLAC support is more common). Or if current setup works fine - don't fix what isn't broken. Format wars don't matter if you're satisfied with current workflow.
Middle ground: Keep existing FLAC library, use ALAC for new rips if you've switched to Apple ecosystem. Or convert gradually (prioritize most-played albums first). Both formats are lossless, so you can convert back and forth without quality concerns. Choose based on convenience, not quality.
将 ALAC 转换为 AAC 的最佳比特率是什么？
256kbps AAC is the sweet spot - transparent (indistinguishable from lossless) for most listeners on most equipment. Apple uses 256kbps for iTunes Store purchases, which tells you they consider it high quality. Files are reasonable size (1MB per minute) while delivering excellent audio quality.
其他选项：192kbps AAC 适用于空间受限的设备（仍然非常好的质量）。320kbps AAC 以获得最佳质量（对大多数人来说过于奢侈，但可保证透明度）。128kbps AAC 适用于流媒体/带宽受限的场景（质量明显较低，但适合背景聆听）。
编码提示：使用 iTunes/Music 应用程序的 AAC 编码器（高质量），或使用 ffmpeg 和 qaac（最佳质量）。启用 VBR（可变比特率）以在相同平均比特率下获得更好的质量。不要过于关注比特率 - 从 ALAC 源编码的 256kbps AAC 听起来很棒。超过 256kbps 的收益递减，除非您是经过训练的音响爱好者，拥有高端设备。