Autrans
Free tool

Audio Converter

Convert audio between every common format. MP3, WAV, M4A, OGG, FLAC, AAC, Opus. Free, fast, browser-based, no signup.

Convert audio between MP3, WAV, M4A, OGG, FLAC, AAC, and Opus. Drop your file, pick the output format, get a download in seconds. Use the per-format converter pages (mp3-to-wav, m4a-to-mp3, flac-to-mp3, etc.) for direct conversions.

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100% in your browser, your files never leave your device. Free, no sign-up.

How it works

How to use the Audio Converter

  1. 1

    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.

  2. 2

    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.

  3. 3

    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.

Need a transcript?

Once you've cleaned up your audio, Autrans turns it into a searchable transcript with speaker labels, summaries, and exports to TXT, DOCX, PDF, SRT, and VTT. Built for African languages: Nigerian English, Pidgin, Yoruba, Hausa, Igbo, plus French and Spanish.

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Frequently asked

Questions, answered

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.
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Related

Video to MP3

Convert video to MP3 online. Extract audio from MP4, MOV, MKV, WebM, AVI. Free, no install, no watermark.

Audio Joiner

Merge multiple audio files into one. MP3, WAV, M4A, OGG, FLAC. Up to 20 files, free, browser-based.

Voice Recorder

Record audio in your browser, save as MP3 or WAV. Free, no install, no signup.

Audio Compressor

Compress audio files to upload or email them. MP3, WAV, M4A. Free, in your browser.

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.

From MP3

From WAV

From M4A

From OGG

From FLAC

From AAC

From OPUS

Start transcribing free

Get 30 minutes of free transcription to start. No credit card required. Just upload your audio and go.

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