🗜️ Audio Compressor
Make podcasts, voice-overs and music files small enough for email, upload limits or faster downloads — with a size estimate before you start and a before/after comparison.
✅ Free · No sign-up
Choose audio files or drag them here
MP3, WAV, M4A, AAC, OGG, Opus, FLAC, WebM · up to 10 files · processed locally
MP3, WAV, M4A, AAC, OGG, Opus, FLAC, WebM · up to 10 files · processed locally
How to use the Audio Compressor
- Add one or more audio files (up to 10).
- Pick the codec, bitrate, sample rate and channels; the estimated output size updates instantly.
- Press Compress, compare the original and compressed versions, and download.
Example
- Input
- 60-minute stereo WAV (~600 MB), MP3 64 kbps mono
- Output
- ≈ 29 MB — about 95% smaller, clear for speech
Why creators use it
- Fit podcast episodes and interviews under upload limits.
- Send voice-overs and drafts by email or chat.
- Reduce music previews and sample packs for faster downloads.
Good to know
- All codecs here are lossy: lower bitrates remove detail you cannot get back. Keep your original file.
- Re-compressing an already small MP3 to a similar bitrate saves little and loses quality; the tool warns when the estimate is not smaller.
- Processing runs in your browser with FFmpeg.wasm (downloaded once, ~30 MB); long files take a while on phones.
Frequently asked questions
What bitrate should I use for a podcast?
64 kbps mono MP3 or 48 kbps mono Opus is clear for speech. Use 128 kbps or more for music.
Will Opus files play everywhere?
Opus/OGG plays in modern browsers, Android and VLC; older Apple devices may need MP3 or AAC.
Are my files uploaded?
No. Compression happens locally.