Convert AIFF to MP3
Turn AIFF and AIF audio into MP3s that most phones, cars and players read, on your own device.
- Nothing is uploaded
- Works offline after first use
- Open source
- No watermark · limit is your device’s memory; phones hold less
Converts AIFF and AIF audio to MP3 at 96 to 320 kbps, with several files at once. It is free, needs no account and adds no watermark, and your files are not uploaded: the AIFF is decoded and the MP3 written in this tab. MP3 is lossy, so keep the AIFF if you may want the best copy later.
Done
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Open the network tab. Your files never appear in it.
Add files and run the tool to see every request this tab makes.
Your files are processed on this device and never sent to a server. Reload the page to clear everything from memory.
AIFF is Apple’s uncompressed audio format. It comes from Logic and other Mac recording and editing programs, from CD rippers and from sample libraries. Like WAV, it keeps every sample, which is about 10 MB a minute in CD-quality stereo. That is too big to email or to keep hundreds of on a phone, and many players and upload forms want MP3.
Worked example. A 3-minute stereo AIFF at 44.1 kHz and 16 bits is about 32 MB (1,411 kbps × 180 seconds ÷ 8). Converted at 192 kbps it is about 4.3 MB (192 kbps × 180 seconds ÷ 8), roughly a seventh of the size. At 320 kbps it is about 7.2 MB.
The page decodes the AIFF, using your browser’s own audio decoder where it has one and a small reader built into the page where it does not, and LAME, running as WebAssembly in the page, writes the MP3. A file recorded at 48 or 96 kHz is written at 44.1 kHz, the sample rate this page uses for MP3.
MP3 is lossy: it throws away detail that cannot be brought back. Keep the AIFF as your master and use the MP3 for sharing. For a smaller copy with no loss, WAV to FLAC also takes AIFF files.
Standard AIFF and AIFC files with 8, 16, 24 or 32-bit samples, and 32-bit float, are read in every browser. AIFC files that use a compression such as µ-law or IMA4 are not; the page says so and writes nothing.
How it works
- Drop one or more .aiff or .aif files, or tap to pick them.
- Keep 192 kbps for music, choose 320 for the highest quality, or 96 for speech.
- Convert. One MP3 downloads straight away; several come as a zip.
In your browser, not on a server
Your browser decodes the sound with the decoders it uses to play media on any website. The new file is written in your tab: MP3 by LAME compiled to WebAssembly, WAV by a few lines of code, FLAC by a small lossless encoder in this site’s code (fixed predictors and Rice coding, as the FLAC format describes), and M4A or OGG by the browser’s own AAC and Opus encoders (WebCodecs), packed by Mediabunny (MPL-2.0). WAV and FLAC keep the original sample rate.
Compared with upload-based tools: Online audio converters upload every file, queue it, cap free use at a few files or a few hundred megabytes, and keep the upload for hours. Recordings of meetings, unreleased songs and voice memos are private. Here the files never leave your device and a whole folder converts at once.
Verify it yourself. Give the page a short while after your first run to save itself for offline use, then turn off Wi-Fi or switch to airplane mode and run the tool again. Or open your browser's developer tools (F12, or Cmd-Option-I on a Mac), pick the Network tab, and watch it while you convert. The panel above does the same count for you.
Questions
How do I convert AIFF to MP3?
Drop the .aiff or .aif file on this page, pick a quality and press Convert. Your browser reads the file and writes an MP3 with the same name and a .mp3 ending. Several files can go at once and download as a zip.
Will the MP3 sound worse than the AIFF?
Yes, a little, because MP3 discards detail to get a smaller file and the AIFF keeps all of it. At 192 kbps or higher most listeners find music hard to tell from the original, but the two are not the same sound. Keep the AIFF if you may need the best copy later.
Are the track name, artist and artwork kept?
No. The MP3 contains the audio only, with no tags and no cover art. The file name stays the same apart from the ending. Add the titles in your music app after converting.
My AIFF will not convert. Why?
The page reads uncompressed AIFF and AIFC with 8, 16, 24 or 32-bit samples, and 32-bit float. It cannot read AIFC files that use a compression such as µ-law or IMA4, or a file that is damaged or cut short in its header. When the page cannot read a file it says so and nothing is written. Export a standard 16-bit AIFF or a WAV from the program that made it and try again.
Can I convert AIFF to MP3 without uploading the file?
Yes. The AIFF is read from your disk and the MP3 is written by code running in this tab, so the audio does not leave your device. Open the network tab while you convert and the file is not among the requests. After your first run the page works offline.
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