Compress Audio
Reduce audio file size by adjusting quality. Processed right in your browser.
Drop your audio file here
or click to choose · MP3 WAV FLAC M4A OGG
Choose fileHow to use
- Drop or choose the audio file to compress.
- Pick a compression level. 'Recommended (128kbps)' fits most cases.
- Hit 'Compress' and the smaller MP3 downloads right away.
Frequently asked questions
How much smaller will my file get?+
Lossless files (WAV, FLAC) shrink by 80–90%. For MP3s it depends on the original bitrate — a 320kbps file compressed to 128kbps shrinks by about 60%.
Will it sound much worse?+
'Recommended (128kbps)' matches typical streaming quality — hard to tell apart in everyday listening. For voice recordings (meetings, lectures), even 'Strong (64kbps)' remains perfectly intelligible.
Are my files uploaded to a server?+
No. Compression happens entirely inside your browser and your file is never sent anywhere.
Which formats are supported?+
MP3, WAV, FLAC, M4A and OGG as input; the result is saved as MP3 for maximum compatibility.
When do I need this?+
When you hit an email attachment cap (usually 25MB), an upload limit on a forum or submission site, or want to free up phone storage.
Does compressing twice shrink it further?+
Re-compressing an already low-bitrate file gains almost nothing and only degrades quality. Compress once, at the level you want.
Guide
What decides an audio file's size?
File size is simply bitrate × duration. A 4-minute song at 320kbps is about 9.6MB; the same song at 128kbps is about 3.8MB. Compression means lowering the bitrate — using less data per second of sound.
Lossless formats (WAV, FLAC) start out far bigger, so the gains are dramatic: a 3-minute WAV is over 30MB, but under 3MB as a 128kbps MP3.
How to pick a compression level
'Recommended (128kbps)' is the right default for most situations — it matches the standard quality tier of major streaming services, so casual listening on earphones sounds the same as the original.
For voice-first files — meetings, lectures, calls — use 'Strong (64kbps)'. Speech carries much less information than music and stays clear at low bitrates. If you're archiving music you care about, 'High quality (192kbps)' is the safe pick.
When is this useful?
Upload limits are the most common reason: email attachments (25MB), community forums, assignment portals and messenger transfer caps all become passable after compression.
It also pays off when archiving dozens of lecture or meeting recordings — voice files compressed to 64kbps fit five times more audio into the same storage.