Audio Compressor
Last updated: June 1, 2026In-browserReduce audio file size.
Audio Compressor is a free online tool to reduce audio file size. It runs entirely in your browser, so your files never leave your device — nothing is uploaded. There's no sign-up, no watermark, and it works on any modern browser on desktop or mobile.
How to use Audio Compressor
The Audio Compressor reduces the size of MP3, WAV, M4A and other audio files by lowering the bitrate — ideal for fitting voice notes, podcasts and music under email and upload limits. It runs privately in your browser with no upload and no watermark.
Read the full guide: How to Compress Audio Files (Reduce Size, Free)
- 1Drop in your audio file.
- 2Choose a lower bitrate to shrink the file.
- 3Compress and download the smaller audio.
Smaller files fast
Lower the bitrate to cut audio size for email, messaging and uploads.
You control quality
Pick the bitrate that balances size against how the audio sounds.
Private and free
Compression runs on your device — no upload, no watermark.
Shrink podcast episodes for hosting
Podcast hosts and RSS feeds often cap episode size or count it against monthly storage. Drop your exported episode in, pick 96 kbps or 64 kbps, and download a smaller MP3 that still sounds clear for spoken word. A one-hour interview drops dramatically in size, so it uploads faster to Spotify, Apple Podcasts, or your host without burning through your plan's quota.
Compress WAV voice memos to email
Phone voice memos and field recordings exported as WAV are huge and bounce off email size limits. This tool converts them to a compact MP3 at a bitrate you choose, so a recording that was too large to attach now fits under Gmail or Outlook caps. The 64 kbps voice setting keeps speech perfectly intelligible while cutting the file to a fraction of the original.
Fit more songs on your phone
When your phone or old MP3 player is running low on storage, re-compressing your music library buys back space fast. Lower each track to 128 kbps for a near-transparent sound, or push to 96 kbps to squeeze in far more songs. Files process locally in your browser, so you can batch through an album without uploading your music collection anywhere.
Audio Compressor — frequently asked questions
How do I make an audio file smaller?
Drop it in, choose a lower bitrate (like 128kbps or 96kbps), then download the compressed file.
Will compressing hurt the sound?
Lower bitrates trade some quality for size. 128kbps is fine for speech; keep it higher for music.
What files can I compress?
MP3, WAV, M4A and other common audio formats.
Is it free?
Yes — free, no watermark and no sign-up.
Is my audio uploaded?
No, it's processed entirely in your browser.
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