Free tools
Compress an audio file, free
Shrink an audio file right in your browser. Pick a target size or bitrate; nothing uploads and there's no signup. Smaller files also transcribe faster if you sign up.
Drop a file or click to choose
Free · no signup · runs in your browser · nothing uploads
Want a transcript of it too? Speaker labels, 21 export formats, first 30 minutes free.
Start – 30 free minutesWant a transcript of it too? Speaker labels, 21 export formats, first 30 minutes free.
Start – 30 free minutesWhy is this free? It runs entirely in your browser — we don't pay for a server to process your file, so there's nothing to gate.
Compress audio in three steps
Drop your file, pick a target size or bitrate, and download, all in your browser. If the end goal is a transcript rather than a smaller file, you can skip compression entirely and convert the audio to text directly; speech to text cares about clarity, not file size.
Why it stays free
The whole thing runs on your device, so we never receive the file, store it, or pay to process it. That is exactly why the tool can stay free.
Pick the right amount of compression
Speech survives compression much better than music: a voice recording stays perfectly intelligible at bitrates that would audibly flatten a song. If the file is mostly talking, the strongest setting usually sounds fine and produces the smallest file. For music, or anything you’ll edit further, stay lighter; every lossy pass throws information away, so compress once, at the end of your workflow, not repeatedly along the way.
Shrink a 400 MB lecture to attachment size
A 400 MB WAV recording of a lecture drops to a small fraction of that at a listening-quality bitrate, small enough to send as an email attachment. When it’s the words you’re after and not the file, transcribe it with speaker labels instead. The opening 30 minutes are free.
Frequently asked questions
Does my file upload?
No. The compression happens in your browser, so the audio is never uploaded anywhere.
Is it free?
Yes. There's no signup and no watermark on what you download.
Will it lower the quality?
Compression trades some quality for size; pick a higher bitrate to keep more quality, or a lower one for a smaller file.
Why compress before transcribing?
Smaller files send faster. Transcription quality depends on clarity, not file size, so light compression is usually fine.
Need the words? Transcribe it with 30 free minutes
A $1 hold confirms your card and releases immediately — you're never charged, and 30 free minutes land right away.
Start – 30 free minutes