Convert M4A to FLAC online

Your M4A file is converted to FLAC right here in your browser, using FFmpeg compiled to WebAssembly. Nothing is uploaded to us, the audio never leaves your device. Quality is preserved and the download is ready in seconds.

What is an M4A file?

M4A is the MPEG-4 audio container, almost always holding AAC-encoded audio. It is what an iPhone produces: Voice Memos, iTunes purchases and most Apple-ecosystem audio are M4A files.

iPhone Voice Memos records M4A, which makes it one of the most common interview and meeting formats in the real world. Many Android recorder apps also default to it.

Why FLAC?

FLAC (Free Lossless Audio Codec) compresses audio the way ZIP compresses files: the data gets smaller (typically 50 to 60% of WAV size) but decodes back to exactly the original samples. Nothing is lost, ever.

Convert to FLAC to archive: you keep bit-perfect quality at roughly half the size of WAV, with full metadata and checksum support built in. It is the right long-term home for irreplaceable recordings. M4A support outside the Apple world is good but not universal, some older car stereos, players and upload forms only take MP3 or WAV.

Frequently asked questions

Will converting M4A to FLAC lose quality?

Honest answer: quality stays exactly where it is, no better, no worse. FLAC is lossless, but it cannot restore detail your M4A already discarded when it was first encoded. What you gain is safety: the FLAC copy can be edited and re-exported repeatedly without any further loss, which is exactly why editors ask for it.

Is it free?

Yes, completely, with no account and no watermark. The conversion runs on your own device, so it costs us nothing to let you use it. The only limit is file size: up to 50 MB, which is what a browser can hold in memory comfortably.

Do I need to install anything, or upload my file?

Neither. It runs entirely in your browser using FFmpeg compiled to WebAssembly. Your audio is never sent to us, which is also why it works on a slow connection, only the page downloads, not your file.

Need a transcript of the audio?

Autrans also transcribes audio in Nigerian English, Pidgin, Yoruba, Hausa, Igbo, French, and Spanish.