How to Convert M4A or WAV to MP3 (In Your Browser, No Upload)
How to convert audio files between MP3, WAV, M4A, OGG, and more — transcoded directly inside your browser with FFmpeg.
Updated 2026-07-16 · 4 min read
Maybe an iPhone voice memo (M4A) won't open in some program, or a WAV your editor spat out is too heavy to share. The fix is to convert it to something that plays everywhere, like MP3. Online converters usually upload the file to a server, but in the browser your audio never leaves your device.
Converting an audio format
- 1Open Audio conversion.
- 2Upload the audio file you want to convert.
- 3Pick the target format (MP3, WAV, M4A, OGG, and so on) and run it — the converted file is saved.
Which format to choose
- •MP3 — best compatibility, small size. The default when you just want it to play anywhere.
- •M4A (AAC) — slightly better quality than MP3 at a similar size.
- •WAV — lossless, great for editing or keeping a master, but large.
- •OGG — an open format, used on the web and in games.
TipIf you're just sharing or playing it, go MP3; if you're keeping an editing master, stay lossless like WAV. For speech rather than music (lectures, meetings), a lower bitrate is still perfectly intelligible and saves more space.
Why in-browser processing helps
- •FFmpeg runs inside the browser, converting your audio directly without uploading it to a server.
- •No sign-up, no software to install.
- •Once loaded, it works offline too.
Convert an audio format right in your browser, right now.
Open Audio Conversion →