AUDIO -> AUDIO · Local tool
Audio Converter
Convert audio between MP3, M4A, WAV and OGG, on your own device.
Last updated
How do I convert audio between formats without uploading it?
Drop the file onto filetity's audio converter and pick MP3, M4A, WAV or OGG. Everything runs in the browser tab, so a recording of a meeting, a lecture or an interview is never uploaded. Each target works differently underneath and the page says which you are getting: WAV needs no encoder at all because it is uncompressed, AAC for M4A and Opus for OGG use encoders your browser already ships, and MP3 uses one served as its own file, because no browser can write MP3 on its own. That last point is why many browser-based converters quietly upload instead. Choose MP3 when it has to play on anything, M4A when the destination is modern, and WAV only when something genuinely needs uncompressed audio.
01 / Your device
the file stays here
02 / Browser memory
the work runs locally
03 / Back to you
saved on this device
When you would use this
Situations, not settings.
- A file the thing you need to use will not open
- The fastest answer to a player, an editor or an upload form refusing a format, without installing anything or uploading the recording.
- Standardising a pile of recordings from different devices
- Phones, recorders and chat apps each write something different. One target format makes the folder usable.
- Getting audio into an editor that wants uncompressed
- WAV needs no encoder at all, so it is the fastest conversion here and the one that loses nothing further.
How it works / no cloud
A conversion engine, not an upload form.
Your browser decodes the source and filetity writes the target: WAV needs no encoder because it is uncompressed, AAC and Opus use the encoders the browser ships, and MP3 uses an encoder served as its own file, because no browser can write MP3 on its own. Which combination you get is shown before you start.
- Offline ready
- Installable app
- No file limit queue
Straight answers
No accordion. Nothing hidden.
- Is it free?
- Yes, with no watermark and no page limit.
- Does it need an account?
- No. There is no account system.
- Is my file processed on my device?
- Yes. The file is read by your browser and never uploaded. There is no server to send it to.
- What formats are supported?
- MP3, M4A, AAC, WAV, OGG and FLAC in. MP3, M4A, WAV or OGG out, at a quality you pick.
- What are the limits?
- One file at a time. A format the browser cannot decode is refused by name rather than producing silence, and a target it cannot write is greyed out rather than failing halfway through.
- Does it work on mobile?
- Yes, on any modern mobile browser. Large files are limited by the memory the phone gives the browser.
- Does it work offline?
- Yes, once the page has loaded. The tool keeps working with no network connection.
- Which format should I actually pick?
- MP3 when it has to play on anything, including a car stereo. M4A when the destination is modern, because AAC sounds better than MP3 at the same size. OGG when you want the smallest file and control the playback software. WAV only when something demands uncompressed audio, because it is roughly ten times larger.
- Why is MP3 handled differently from the others?
- Because no browser can write it. Chrome and Firefox both decode MP3 and neither will encode it, so an encoder is served as a separate file and loaded when you pick MP3. That is also why other browser-based converters quietly upload your file instead: it is easier than shipping an encoder.
- Does converting between two lossy formats hurt?
- Yes, a little, every time. Each lossy encode discards information permanently, so MP3 to M4A to MP3 is worse than the original even though nothing visibly happened. Convert from the best copy you have rather than from something already converted, and convert once.
- Will it convert a file with an unusual sample rate?
- Yes, resampling where the target requires it. MP3 supports only six sample rates and nothing above 48 kHz, so a 96 kHz recording comes down, and Opus works internally at 48 kHz. The page states the rate it is going to write before you start rather than changing it quietly.
- Is there a size or length limit?
- None imposed here. The whole file is held in memory while it is converted, so the real limit is your device, which on a desktop means very long recordings are fine and on an old phone means they are not. Nothing is queued and nothing is uploaded, so there is no server limit to hit.
Keep working locally
3 available · more coming