Reduce Audio File Size
Make a recording small enough to email or upload — free, private, and instant.
Optimize for — sets bitrate & channels
Output settings
Selection
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Original
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Estimated output
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Saved
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Recommendation
Load an audio file to see a tailored suggestion.
Encoding…
100% private — your audio is processed locally and never uploaded to any server.
Get under the limit
Email services usually cap attachments at 20–25 MB, and many upload forms are stricter. A single uncompressed recording can blow past that easily. The Audio Optimizer on this page makes audio smaller right in your browser, so you can fit it into an email, a form or a messaging app without uploading it anywhere first.
Three controls do the work: lower the bitrate, switch stereo to mono (great for voice), and trim away anything you do not need. Together they routinely cut a file by 80–95%. The live size estimate tells you exactly when you are under your target.
For spoken word, mono at 48–64 kbps is tiny and perfectly clear. For music you want to keep listenable, try 96–128 kbps.
Step by step
- Drop your audio onto the upload area or click to browse.
- Pick the "Voice memo" or "Podcast" preset for the smallest clear result, or set the bitrate yourself.
- Switch to mono for speech to roughly halve the size again.
- Optionally trim the clip with the waveform handles.
- Watch the estimated output size, then click Optimize & download.
Tips
- For voice, mono at 48–64 kbps sounds clear and is a fraction of the original size.
- Trimming silence and dead air shrinks the file with no quality loss at all.
- If you are close to an email limit, drop the bitrate one step and re-check the estimate.
- MP3 is the right choice here — WAV is uncompressed and will be far larger.
- The green recommendation dot lights up when the result is comfortably small for the web and sharing.