Instant on phones, real FFmpeg when you need it
Converting to MP3 or WAV uses your browser’s own audio decoder and a tiny built-in encoder — there is nothing to download,
so it starts immediately, even on a phone over mobile data. For M4A, FLAC and OGG output (or unusual inputs) the converter
switches to FFmpeg — the open-source engine behind practically every media application — compiled to WebAssembly and run
inside your browser; it downloads once (31 MB) and is saved on your device. Because conversion happens on your device either
way, voice memos, interviews, demos and unreleased music are never uploaded to anyone's server — which is the entire problem
with most online audio converters.
Choosing a format honestly
- MP3 — plays on absolutely everything; 192 kbps is transparent for most content. The default for sharing.
- M4A (AAC) — slightly better quality per megabyte than MP3; native on Apple devices.
- WAV — uncompressed; what editors, DAWs and CD burners want. ~10 MB per minute.
- FLAC — lossless at roughly half of WAV's size; the archival choice.
- OGG — the open web/game format; small and high quality, less universal on old hardware.
One rule saves most regret: converting lossy to lossy (MP3→OGG, M4A→MP3) re-encodes and loses a little each time — do it
once, at 192 kbps or above, and keep an original.
What it opens
MP3, WAV, M4A/AAC, FLAC, OGG/Opus (WhatsApp and Telegram voice notes), AIFF, WMA, AMR and most other common audio.
DRM-protected files (old iTunes M4P, Audible) are the exception — the protection is legal, not technical, and no honest
converter removes it.
Frequently asked questions
Is my audio really not uploaded anywhere?
Really. MP3 and WAV conversions use your browser’s own audio decoder plus a tiny built-in encoder — nothing extra to download, which is why they work instantly on phones too. Other formats use FFmpeg — the same open-source engine behind most media software — compiled to WebAssembly and downloaded to your browser once (31 MB, then saved on your device). Either way, files are read and written on your own device. For voice notes, interviews and demos, that privacy is the point.
Which format should I convert to?
MP3 plays on everything and is the safe choice for sharing. M4A (AAC) sounds slightly better at the same size and suits Apple devices. WAV is uncompressed for editing. FLAC is lossless at about half the size of WAV — right for archiving. OGG is the open format used on the web and in games.
What bitrate should I pick?
192 kbps is transparent for most music and most ears; 128 kbps suits voice recordings and podcasts; 320 kbps is the maximum for MP3. Converting a low-bitrate file to a higher bitrate does not add quality back — it only makes the file bigger.
Does converting lossy to lossy lose quality?
A little, each time — MP3→OGG re-encodes already-compressed audio. One conversion at 192 kbps or above is inaudible for most content; avoid converting the same file repeatedly, and keep an original.
Can it handle voice memos and WhatsApp audio?
Yes — M4A voice memos, OPUS/OGG voice notes and AMR recordings all open and convert to MP3 or WAV for editing, transcription tools, or sharing with people whose apps refuse the original format.