Is my your audio file file uploaded?

No. The conversion runs inside your browser with WebAssembly and native browser decoders. The file never leaves your device; you can watch the Network tab stay empty while it converts.

Is there a file size or daily limit?

No limit set by us. The only ceiling is your device's memory, because everything happens locally. There is no queue, no account requirement and no daily count.

How do I know the ALAC output is valid?

Every output is checked before it is offered: the bytes are re-read and the format signature, size and structure are verified. If a result cannot be validated it is not shown as a result.

Does it work on iPhone and iPad?

Yes. The same app runs in Safari and as the Omni Converter app on iOS, where Save opens the share sheet so the file lands in Files, Photos or any app you choose.

Audio format

Audio to ALAC

Encode Apple Lossless audio in an M4A container with selectable 16-bit or 24-bit precision.

Runs in your browser. Nothing is uploaded, nothing is stored, and the ALAC output is validated before you see it.

Open the converterFree. No account. Drop several files at once if you like.

How it works

Drop, pick or paste your file. It is recognised the moment it lands.
Choose Audio to ALAC. Only conversions this file can really do are offered.
Save. One file, a bundle, or a whole folder. On iPhone the share sheet opens so it lands in Files or Photos.

What you get

Apple Lossless
M4A
16/24-bit
Music library

Engine: FFmpeg WASM ALAC encoder. Accepted inputs: WAV, MP3, FLAC, M4A, AAC, OGG, OPUS, WEBM, MKA, MOV, M4R, AIF, CAF, AC3, EAC3, OGA, WMA, WV and more.

Questions

Is my your audio file file uploaded?: No. The conversion runs inside your browser with WebAssembly and native browser decoders. The file never leaves your device; you can watch the Network tab stay empty while it converts.
Is there a file size or daily limit?: No limit set by us. The only ceiling is your device's memory, because everything happens locally. There is no queue, no account requirement and no daily count.
How do I know the ALAC output is valid?: Every output is checked before it is offered: the bytes are re-read and the format signature, size and structure are verified. If a result cannot be validated it is not shown as a result.
Does it work on iPhone and iPad?: Yes. The same app runs in Safari and as the Omni Converter app on iOS, where Save opens the share sheet so the file lands in Files, Photos or any app you choose.