Compress Audio for Web
Shrink audio file sizes for fast-loading pages — 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.
Why audio weight matters on the web
Audio is easy to forget when you are optimising a website, but an uncompressed WAV or a high-bitrate MP3 can be several megabytes — enough to slow a page intro, a background loop or an embedded clip. The Audio Optimizer on this page compresses audio entirely in your browser using the Web Audio API and a built-in MP3 encoder, so nothing is ever uploaded.
The biggest lever is bitrate: dropping a music track from 320 kbps to 128 kbps roughly halves the file with little audible difference for most listeners on the web. For speech, switching to mono and 64–96 kbps can cut the size by 75% or more while staying perfectly clear.
A practical target: spoken word at 64–96 kbps mono, web music at 128 kbps, and anything above 192 kbps reserved for downloads rather than streaming on a page. The live size estimate shows exactly where you land before you export.
Step by step
- Drag your audio onto the upload area or click to browse. MP3, WAV, M4A, OGG and FLAC are accepted.
- Optionally trim the clip by dragging the waveform handles — shorter audio means a smaller file.
- Pick an "Optimize for" preset (Music, Podcast, Web background) or set the bitrate manually.
- Switch to mono for voice to roughly halve the size again.
- Watch the estimated output size, then click Optimize & download to save the MP3.
Tips
- 128 kbps stereo is the sweet spot for music on the web — transparent enough for most listeners at a small size.
- For podcasts and narration, mono at 64–96 kbps sounds clear and saves a lot of bandwidth.
- Trimming silence at the start and end is a free, lossless way to shrink a file.
- Re-compressing an already-low-bitrate MP3 will not help much and may hurt quality — start from the highest-quality source you have.
- Use the green recommendation dot as a guide: it lights up when the output is comfortably web-friendly.