Free tool

Audio Converter

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

Bulk-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

    Add your audio

    Drop a file into the Audio Converter or record straight in your browser. Nothing is uploaded — it runs on your device.

  2. 2

    Edit and adjust

    Trim, convert, tune the EQ, fades and levels, then preview instantly.

  3. 3

    Export or transcribe

    Download the result free, or turn it into a searchable transcript with one click.

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?
Free conversions handle files up to 100 MB. Pro covers files up to 500 MB and batch jobs of up to 50 files per session.
Can I convert multiple files at once?
Batch conversion is a Pro feature. Free users can convert files individually as often as they want.
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.

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

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