Compress Audio audio.
Shrink an audio file to a smaller MP3, pick a level, keep it listenable.
Drop an audio file here or click to browse
MP3, WAV, OGG, FLAC, M4A, AAC, Opus · processed privately, never uploaded
Make an audio file smaller by re-encoding it to an MP3 at a lower bitrate, handy for fitting an email limit, saving phone storage, or speeding up an upload. It runs on your device: no upload, no account, no watermark.
How audio compression shrinks the file
An audio file's size is driven mostly by its bitrate, the amount of data used per second of sound. Lowering the bitrate is what makes the file smaller. This tool re-encodes your audio to an MP3 at the bitrate you choose, so a heavy file becomes something you can actually attach or upload. The bigger the gap between the source bitrate and the level you pick, the more you save; a 320 kbps track dropped to 128 kbps is roughly 2.5× smaller.
Which level to choose
The one control is the compression level, a trade-off between size and fidelity. 192 kbps is light compression that keeps music sounding close to the source. 128 kbps is the everyday sweet spot most listeners can't fault. 96 kbps starts to trade audible detail for a noticeably smaller file. 64 kbps is best kept for spoken-word content, podcasts, voice memos, lectures, where there's no rich instrumentation to preserve and the tiny file is pure upside. Pick the lowest level that still sounds acceptable for how the audio will be used.
Compression is one-way, so keep the original
MP3 is lossy: shrinking the file permanently discards audio data, and re-compressing an already-compressed file stacks loss on loss. That's fine for a finished piece you're sharing, but if you might still edit or remaster, hold onto the original and treat the compressed MP3 as an export copy. Also note this compresses the whole file at its current volume, it won't trim silence, fade, or normalize levels, so do that in an editor first if you need it.
Tips
- 128 kbps is the safe default for music; most people can't tell it from the original in casual listening.
- For voice, podcasts, interviews, memos, 64 or 96 kbps sounds fine and makes the file tiny.
- The savings depend on the source: a file already at a low bitrate won't shrink much further.
- Keep your original file if you might edit again, since MP3 compression can't be reversed.
How it works
- 01
Add your audio
Drop in an MP3, WAV, M4A, FLAC, OGG, AAC, or Opus file, it stays on your device.
- 02
Pick a level
Lower bitrate means a smaller file. 128 kbps suits most music; 64 kbps is great for voice.
- 03
Download the MP3
Save the smaller, compressed MP3, ready to email or upload.
Questions
- How much smaller will the file get?
- It depends on the source bitrate. Dropping 320 kbps music to 128 kbps is about 2.5× smaller; a high-bitrate file taken to 64 kbps for voice can shrink far more. A file already at a low bitrate won't change much.
- Will compressing hurt the sound quality?
- Some detail is discarded because MP3 is lossy, but at 128 or 192 kbps it's hard to notice for most listening. Lower levels like 64 kbps are best reserved for voice, where the smaller size matters more than fidelity.
- What formats can I compress?
- You can drop in MP3, WAV, M4A, FLAC, OGG, AAC, or Opus. The tool outputs a compressed MP3, which plays everywhere.
- Is my audio uploaded to compress it?
- No. Compression runs in your browser on your own device, so the file is never uploaded, there's no account and no watermark.