Convert audio between every common format. MP3, WAV, M4A, OGG, FLAC, AAC, Opus. Free, fast, browser-based, no signup.
Loading tool…
100% in your browser, your files never leave your device. Free, no sign-up.
Drop in your audio file
Drag in an MP3, WAV, M4A, OGG, FLAC, AAC or Opus file, including WhatsApp voice notes, which are Opus files. It opens on your device; nothing is uploaded.
Pick the output format
Choose what you're converting to. Lossless (WAV, FLAC) for editing and archiving, lossy (MP3, AAC, OGG, Opus) for smaller files and sharing.
Download the converted file
The conversion runs in your browser and the download is ready in seconds, or send the audio straight to transcription instead.
Frequently Asked Questions
Everything you need to know before using Audio Converter
What's the difference between lossy and lossless audio formats?
Lossy formats (MP3, AAC, OGG, Opus) compress audio by discarding inaudible detail, smaller files, slight quality drop on re-encodes. Lossless formats (WAV, FLAC) preserve every sample at the cost of larger files. Convert to WAV or FLAC for editing and archive; convert to MP3 or AAC for sharing.
Will converting affect audio quality?
Lossless → lossless or lossless → lossy preserves perceptual quality at Autrans's default VBR. Lossy → lossy re-encodes through a high-quality codec but slight degradation is unavoidable on repeated re-encodes, convert from your original source when possible.
What's the maximum file size?
Up to 50 MB with no account, and up to 500 MB signed in on Pro. The limit is how much a browser can hold in memory, not a paywall. The conversion runs on your own device and never reaches a server.
Can I convert multiple files at once?
Not yet, convert them one after another, as many as you like. There is no queue, no daily limit and no account needed, because each conversion happens in your own browser.
Does Autrans preserve metadata (artist, album, etc.)?
Yes. ID3 and Vorbis comments are carried across whenever the target format supports them. Convert WAV → MP3 and your title and artist tags survive.
What sample rate does the converter use?
Default is to preserve the source sample rate. Autrans handles 8 kHz (phone) through 48 kHz (studio) without resampling unless the target format requires it.
All part of Autrans's free audio toolbox, quick, private, browser-based tools for the everyday audio jobs creators and teams actually do: cut, convert, compress, join, record. No sign-up, no watermarks, nothing leaves your device.
Convert between formats
Free, browser-based conversion between every common audio format. Pick a pair to convert directly.