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 ...
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Your files never left your device
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, CBR/VBR, sample rate, channels, optional trimming (start/end in seconds) and ID3 tags (title, artist).
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) and the ID3 tags title/artist apply IDENTICALLY to every file in the batch: convenient when a whole album should get the same bitrate or the same artist tag, but not meant for files that need different titles, artists or 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.
The ID3 tags now also cover album, genre, year and track number, not just title and artist; embedding a cover image is deliberately not supported here - that needs a dedicated tag editor.
| Input formats | MP3, WAV, M4A, AAC, OGG, FLAC |
|---|---|
| Output format | MP3 |
| Batch processing | Yes |
| Processing | Locally in your browser (WebAssembly) |
| File upload | None |
Limitations: WAV and FLAC are lossless; bitrate and VBR do 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) and the ID3 tags apply 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. Album, genre, year and track number are plain text fields like title/artist and apply identically per batch file too; a cover image is not supported.
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 or the same artist). For different titles, artists or trims per file, convert them one at a time. The same applies to album, genre, year and track number.