Autrans
Free tool

Audio Compressor

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

Shrink large audio files for email attachments, upload limits, and faster sharing. Drop a file, export to MP3, and the compressor re-encodes it to a smaller size right in your browser, no upload, no sign-up.

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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 Compressor

  1. 1

    Drop in the large file

    Drag in an MP3, M4A, OGG or WAV that's too big to send. It opens on your device, nothing is uploaded to us.

  2. 2

    Export to MP3

    The compressor re-encodes the audio at a bitrate that keeps speech clear while cutting the size dramatically, WAV files often shrink 80 to 90%.

  3. 3

    Download and share

    Save the smaller file and send it over email, WhatsApp or any upload form that rejected the original.

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

How do I compress an audio file?
Drop your file into the compressor, pick MP3 as the output, and export. The file is re-encoded to a much smaller size while keeping speech clear, all in your browser.
Will compressing reduce audio quality?
Compression trades some fidelity for size. For voice and podcasts the difference is inaudible at typical bitrates; for music, export at a higher bitrate to keep quality.
Is the audio compressor free and private?
Yes, it's free with no sign-up, and your audio never leaves your device because the compression runs entirely in your browser.
What formats can I compress?
MP3, M4A, OGG and WAV. WAV files shrink dramatically when exported to MP3, often by 80 to 90%.
Related transcription use cases
Podcast Transcription Service
Turn podcast episodes into blog posts, show notes, and searchable transcripts. Grow your audience with SEO-friendly text content from every episode.
Voice Memo Transcription
Transcribe iPhone / Android voice memos into searchable text notes.

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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 to start. No credit card required. Just upload your audio and go.

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