🎼 MP3 转 WAV（也支持 M4A、AAC、OGG、FLAC）MP3 to WAV Converter (also M4A, AAC, OGG, FLAC)
把 MP3、M4A（AAC）、OGG、FLAC 等音频解码为无压缩的 WAV（PCM）：保持原采样率或改为 48 / 44.1 / 22.05 / 16 / 8 kHz，可选 16 位、24 位或 32 位浮点，立体声或单声道，并可截取片段，适合剪辑软件、语音识别和需要 WAV 的设备，全部在浏览器本地完成。Decode MP3, M4A (AAC), OGG, FLAC and other audio into uncompressed WAV (PCM) — keep the original sample rate or pick 48 / 44.1 / 22.05 / 16 / 8 kHz, 16-bit, 24-bit or 32-bit float, stereo or mono, with optional trimming — for editors, speech recognition and devices that need WAV. Everything runs locally in your browser.
使用说明与常见问题How-to & FAQ
「MP3 转 WAV（也支持 M4A、AAC、OGG、FLAC）」是什么？What is the MP3 to WAV Converter (also M4A, AAC, OGG, FLAC) tool?
把 MP3、M4A（AAC）、OGG、FLAC 等音频解码为无压缩的 WAV（PCM）：保持原采样率或改为 48 / 44.1 / 22.05 / 16 / 8 kHz，可选 16 位、24 位或 32 位浮点，立体声或单声道，并可截取片段，适合剪辑软件、语音识别和需要 WAV 的设备，全部在浏览器本地完成。Decode MP3, M4A (AAC), OGG, FLAC and other audio into uncompressed WAV (PCM) — keep the original sample rate or pick 48 / 44.1 / 22.05 / 16 / 8 kHz, 16-bit, 24-bit or 32-bit float, stereo or mono, with optional trimming — for editors, speech recognition and devices that need WAV. Everything runs locally in your browser.
如何使用「MP3 转 WAV（也支持 M4A、AAC、OGG、FLAC）」？How do I use the MP3 to WAV Converter (also M4A, AAC, OGG, FLAC) tool?
在「MP3 转 WAV（也支持 M4A、AAC、OGG、FLAC）」中，选择或拖入文件，按需设置「采样率」、「位深」、「声道」、「开始（秒或 分:秒）」、「结束」等选项，然后点击「转换为 WAV」按钮即可。In the MP3 to WAV Converter (also M4A, AAC, OGG, FLAC): Choose or drop your files, set "Sample rate", "Bit depth", "Channels", "Start (s or m:ss)", "End", then click "Convert to WAV".
MP3 转 WAV 会让音质变好吗？Does converting MP3 to WAV improve quality?
不会。MP3 是有损格式，压缩时丢掉的细节无法恢复；WAV 只是把解码后的声音原样、不再压缩地保存下来，所以音质和原 MP3 完全一样，文件却会大很多（44.1 kHz 16 位立体声约每分钟 10 MB）。转换的意义在于兼容：很多剪辑软件、采样器、语音识别接口、电话系统和硬件设备只接受 WAV。No. MP3 is lossy and the detail removed during compression cannot be restored; WAV just stores the decoded sound uncompressed, so it sounds exactly like the MP3 but is much larger (about 10 MB per minute at 44.1 kHz, 16-bit stereo). The point is compatibility: many editors, samplers, speech-recognition APIs, phone systems and hardware devices accept only WAV.
采样率和位深怎么选？Which sample rate and bit depth should I pick?
一般保持原采样率（MP3 通常是 44.1 kHz）并选 16 位 PCM，兼容性最好。视频剪辑常用 48 kHz；语音识别接口常要求 16 kHz 单声道；电话/IVR 系统常用 8 kHz。24 位和 32 位浮点不会提高 MP3 的音质，只在后续还要做大量处理时有用；32 位浮点能保留超过满幅的采样，16/24 位会把它们削波并提示数量。改变采样率时用浏览器内置的重采样。Usually keep the original rate (MP3s are typically 44.1 kHz) with 16-bit PCM for the widest compatibility. Video editing often uses 48 kHz; speech-recognition APIs often want 16 kHz mono; phone/IVR systems often use 8 kHz. 24-bit and 32-bit float do not make an MP3 sound better and only help if you will process the audio heavily; 32-bit float keeps samples above full scale, while 16/24-bit clips them and says how many. Sample-rate changes use the browser's built-in resampler.
“保持原采样率”是怎么知道原采样率的？How does Keep original know the source sample rate?
从文件头读取：MP3 读第一个帧头，WAV 读 fmt 块，FLAC 读 STREAMINFO，M4A/AAC 读 mp4a 音频描述。OGG 读 Vorbis 标识头，Opus 固定按 48 kHz 解码。读不出来时（例如 WebM）按 44.1 kHz 输出并在结果中注明。HE-AAC 文件的描述里有时只记录核心采样率（实际播放频率的一半），这时可以直接选择 44.1 或 48 kHz。It is read from the file header: the first frame header for MP3, the fmt chunk for WAV, STREAMINFO for FLAC and the mp4a description for M4A/AAC. OGG reads the Vorbis identification header, and Opus always decodes at 48 kHz. When it cannot be read (WebM, for example), 44.1 kHz is used and the result says so. HE-AAC files sometimes record only the core rate (half the playback rate); in that case just choose 44.1 or 48 kHz.
M4A、AAC、OGG 也能转 WAV 吗？Can M4A, AAC or OGG be converted to WAV too?
可以。只要浏览器能解码就行：MP3、M4A/AAC（包括 iPhone 录音）、OGG Vorbis、Opus、FLAC、WebM 音频和 WAV 本身。受 DRM 保护的 .m4p、.aax 不能解码。文件最大 512 MB，输出的 WAV 不能超过 4 GB（WAV 格式的上限）。Yes, anything the browser can decode: MP3, M4A/AAC (including iPhone recordings), OGG Vorbis, Opus, FLAC, WebM audio and WAV itself. DRM-protected .m4p and .aax files can't be decoded. Files can be up to 512 MB, and the WAV output cannot exceed 4 GB (the WAV format limit).
文件会上传吗？Is my file uploaded?
不会。音频用浏览器内置解码器解码，WAV 在本地生成，文件不会离开你的设备。No. The audio is decoded by the browser's built-in decoder and the WAV is written locally; the file never leaves your device.
「MP3 转 WAV（也支持 M4A、AAC、OGG、FLAC）」免费吗？需要注册吗？Is the MP3 to WAV Converter (also M4A, AAC, OGG, FLAC) free? Do I need an account?
「MP3 转 WAV（也支持 M4A、AAC、OGG、FLAC）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The MP3 to WAV Converter (also M4A, AAC, OGG, FLAC) is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.