Convert audio files locally between MP3, WAV, M4A, FLAC, AAC and OGG - one at a time or as a batch, no upload.
Running locally on your device ...
Running locally on your device ...
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Your files never left your device
Continue with this file
No re-upload neededThese tools accept .MP3 - your file is handed over directly.
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
MP3, WAV, M4A, FLAC, AAC and OGG are supported differently depending on device, editor or platform. This tool converts one or several audio files locally between these formats - with selectable bitrate, channels and optional trimming (start/end in seconds).
Drop several files at once to convert them as a batch - all of them run through the same pass with the same chosen settings. Trimming (start/end) applies IDENTICALLY to every file in the batch: convenient when a whole album should get the same bitrate, but not meant for files that need different trims - convert those one at a time instead.
Like every gottrix tool, conversion runs in the browser (ffmpeg.wasm, self-hosted). Your audio files are not uploaded.
For orientation when choosing a format: a voice recording for the phone may stay small and space-saving, whereas a recording meant for later editing is better kept uncompressed so it loses no substance. Lossy formats suit comfortable listening and sharing, lossless ones suit editing and archiving. Converting an already-squeezed recording again, however, stacks losses - each additional pass can leave audible traces without ever recovering what was lost.
| Input formats | MP3, WAV, M4A, AAC, OGG, FLAC |
|---|---|
| Auto-conversion | MP4 |
| Output formats | MP3, WAV, M4A, FLAC, AAC, OGG |
| Batch processing | Yes |
| Processing | Locally in your browser (WebAssembly) |
| File upload | None |
Limitations: WAV and FLAC are lossless; bitrate does not apply there (FLAC is compressed, WAV is not). M4A, AAC and OGG use the chosen bitrate. Very long files need time and memory in the browser. When converting several files in one run, trimming (start/end) applies IDENTICALLY to every file in the batch - convert files with different values one at a time. If a single file in the batch fails (e.g. no audio track), the rest are still converted; the failed file shows up as a short error text file in the result. ID3 tags (title, artist, album, cover art ...) are not edited here - that needs a dedicated tag editor.
| Format | Lossless? | Bitrate applies? | Typical use |
|---|---|---|---|
| MP3 | no | yes | device-wide playback |
| WAV | yes | no | editing and archiving |
| M4A | no | yes | Apple devices |
| FLAC | yes | no | lossless archiving, smaller than WAV |
| AAC | no | yes | compact, device-wide playback |
| OGG | no | yes | open web format |
No, everything stays local in the browser.
WAV or FLAC for lossless editing, MP3/M4A/AAC/OGG for small, device-wide playback.
Yes. Set start and end in seconds; leave empty for the whole file.
No. What MP3 already discarded does not return via WAV.
Use the "MP4 to MP3" tool.
Yes. Drop several audio files into the batch; all of them are converted with the same settings and, with more than one file, downloaded as a ZIP.
Yes, identically for every file in that run - meant for shared settings (e.g. the same bitrate). For different trims per file, convert them one at a time.
Fundamentally technical: those services upload your file to a server, convert it there and send it back - your audio leaves your device. Here the same conversion runs entirely in the browser via ffmpeg.wasm; nothing is ever uploaded, and there is no hourly limit and no account.
Yes, directly in the mobile browser, no app needed. For very long files or a large batch, though, a desktop computer with more memory is more comfortable and faster.
MP4 to MP3 · Convert video · Compress video · Normalize audio · Trim audio · Merge audio files