Convert
Convert audio without uploading it anywhere
Convert audio files between MP3, WAV, OGG and FLAC formats locally in your browser with no upload.
For the best results: Convert to WAV or FLAC only when an editor demands it. Both are far larger than MP3 or OGG. For sharing or web use, MP3 keeps quality most people cannot distinguish at a fraction of the size.
Advanced settingsoptional, defaults work well
Converted entirely in your browser, your files are never uploaded. Very large files depend on your device's memory.
What is Audio Converter?
Audio Converter is a free file converter that converts audio files between MP3, WAV, OGG and FLAC formats directly in your browser, so recordings never get uploaded to a server. The audio is converted by an ffmpeg engine that runs inside your browser, so your recordings never leave your device. No upload, no queue, and no account, and once the engine has loaded it works even offline.
- ✦Runs entirely in your browser. Nothing you enter is ever uploaded
- ✦No account, no sign-up, and no data leaves your device
- ✦Works offline once the page has loaded
See it in action
A voice memo has to reach three destinations: a transcription service that wants WAV, a website that wants OGG, and an archive in FLAC.
What you drop in
memo.m4a, converted three times with Convert to set to each format
What you get
Three files from the same 2-second test source: memo.ogg at 8 KB, memo.flac at 32 KB, memo.wav at 172 KB, each decoding to exactly 2.0 seconds.
Tip: The size spread tells the story: OGG is the small lossy option, FLAC is lossless at roughly a fifth of WAV, and WAV is uncompressed. Converting to the same format you started with gets a "-converted" name so nothing overwrites.
Use cases
What people use it for
Convert FLAC album masters into MP3s that fit comfortably on a phone with modest storage.
Turn OGG exports from recording software into WAV files an older editing suite will open.
Switch a podcast episode between WAV and MP3 on a locked-down work laptop with nothing installed.
Who uses Audio Converter?
Independent musicians
convert demo mixes between studio formats and shareable MP3s without unreleased tracks ever leaving their own computer
Podcast producers
move episodes between the WAV files their editor wants and the MP3s their hosting platform expects
Music collectors
turn FLAC archives into phone-friendly MP3 copies while keeping the lossless originals safely untouched
How it works
- 1Choose your files. They open in your browser, not on a server.
- 2Your device converts, compresses, or resizes them locally, with no upload.
- 3The converted files download straight back; nothing is kept anywhere.
Tips for the best results
- Always convert from the highest-quality source you have rather than from an already-compressed copy.
- Keep a lossless master in FLAC or WAV and generate MP3s from it whenever you need them.
- Avoid chaining lossy conversions such as OGG to MP3 to OGG, since each hop discards more detail.
- Very long recordings are limited by your device's memory, so close heavy tabs before converting them.
- Load the page once on wifi so the engine is cached before you need it offline.
FAQ
Frequently asked questions
What is the difference between lossy and lossless audio formats?
Lossless formats such as FLAC and WAV preserve every sample of the original recording, so nothing is ever discarded. Lossy formats like MP3 and OGG analyze which sounds human hearing is least likely to notice, usually quiet details masked by louder ones, and throw them away to shrink the file. That trade is permanent: once detail is gone, no later conversion can recover it.
Will converting an MP3 to FLAC make it sound better?
It will not, and this is worth understanding before you fill a drive with oversized files. FLAC faithfully stores whatever it is given, and what it is given here is audio that MP3 compression already stripped. The result is a much larger file with exactly the sound of the source MP3. Convert to FLAC only when your source is genuinely lossless.
Does my audio get uploaded to a server for conversion?
No, at no point. The conversion runs inside your browser tab using ffmpeg compiled to WebAssembly, so the file goes from your disk into the tab's memory and back out as a download. Demo tracks, client audio, and private recordings never travel across the network, which is a guarantee upload-based converter sites cannot make.
Why does the first conversion take longer than the rest?
On first use the page fetches the conversion engine, a WebAssembly build of ffmpeg, and your browser caches it. That one-off download is the only wait involved; afterwards every conversion starts the moment you press Convert.
Which audio format should I actually choose?
Pick MP3 when compatibility matters most, since virtually every device and app made this century plays it. Choose FLAC for archiving originals, because it halves the size of WAV while remaining mathematically identical to it. WAV suits editing software and audio production, where uncompressed data is easiest to process. OGG mainly matters when a game engine or open-source project specifically asks for it.
Is this an AI audio converter?
No. It is ffmpeg, the standard open-source audio engine, compiled to run inside your browser, and it behaves deterministically: the same file with the same settings produces an identical result every time. Nothing is interpreted or guessed, conversions are instant and predictable, and your audio is processed on your device rather than a remote system.
Can I convert audio files offline?
Yes, once the page has loaded the engine. The roughly 31 MB converter downloads on your first visit and is cached by the browser, after which the tab needs no connection at all. Load the tool before a flight or a trip beyond mobile coverage and it converts exactly as it would online.
What is the best audio format for sound quality?
Among these four, FLAC and WAV are tied for quality because both are lossless; FLAC simply stores the identical audio in about half the space. Between the lossy pair, a high-bitrate MP3 or OGG is indistinguishable from lossless for most listeners on most equipment, so quality in practice depends on bitrate, not format loyalty.
Are there any usage limits?
None. Everything is generated locally in your browser, so there is no server cost, no metering, and no daily cap, use it as many times as you like, completely free.
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