Practical focus
Use this page when you need a general audio compressor and are not sure which format, bitrate, or target size to choose.
Private browser-based audio compression
Audio Compressor
Compress MP3, WAV, M4A, AAC, OGG, and FLAC audio by quality, bitrate, or target MB directly in your browser.
Your audio is compressed locally in your browser. Files are not uploaded to a server.
MP3 / WAV / M4A / AAC / OGG / FLAC inputMP3M4A / AACOGG
File-
Size-
Duration-
Your audio is compressed locally in your browser. Files are not uploaded to a server.
Compression mode
Advanced settings
Select an audio file to begin.
Compression result
Original size-
Compressed size-
Saved-
Output-
Bitrate-
Quick tips
- Balanced is the safest first choice when you only need a smaller file.
- Target Size is better when a form, email service, or chat app has a hard MB limit.
- Voice recordings usually work well as mono at 64-96 kbps; music usually needs 128-192 kbps.
How to use
- Start with Balanced if you only want a quick smaller copy and do not know the source bitrate.
- Switch to Target Size when you must meet an upload limit such as 10MB, 16MB, or 25MB.
- For voice notes, lectures, and meetings, choose mono and try 64-96 kbps before lowering quality further.
- For songs or music demos, keep stereo and test 128-192 kbps, then preview the result before downloading.
- Keep the original file when the audio is important, especially if the source is WAV or FLAC.
Recommended settings
| Use case | Suggested setting |
|---|---|
| Voice notes | MP3, mono, 64-96 kbps |
| Podcasts | MP3, mono or stereo, 96-128 kbps |
| Music sharing | MP3, stereo, 128-192 kbps |
| Email attachment | Target Size mode, 10-25MB |
| Archive copy | Higher bitrate, keep original sample rate |
Supported formats
Common inputs include MP3, WAV, M4A, AAC, OGG, and FLAC, depending on browser decoding support and ffmpeg.wasm.
Practical outputs are MP3 for compatibility, M4A/AAC for efficient mobile playback, and OGG for web or project assets.
Quality vs file size
Audio size is mostly controlled by duration, bitrate, format, sample rate, and channels. Longer audio needs more bits, and bitrate is usually the most direct file-size control.
Mono can greatly reduce spoken-word files because voice often does not need stereo. WAV and FLAC are usually much larger than MP3 or AAC for sharing copies.
A promise of "no quality loss" is not realistic for large reductions. If you need a much smaller file, expect some trade-off and listen to the output.
Privacy and local processing
Compression runs in your browser, so the original audio is not uploaded to a server.
Large files can still be slow because decoding and encoding use your device memory and CPU.
Things to watch
- This is a file-size compressor, not a studio dynamic range compressor plugin.
- Do not force long music into a very small target unless lower fidelity is acceptable.
- A target size estimate can finish slightly above or below the exact MB value because containers and metadata add overhead.
FAQ
What is an audio compressor?
It can mean two things. This page compresses audio file size by changing encoding settings; a studio audio compressor changes loudness dynamics.
Is this the same as a studio audio compressor?
No. A studio compressor changes the relationship between loud and quiet sounds. This tool reduces file size by changing format, bitrate, sample rate, or channels.
Does this tool upload my audio?
No. The compression process runs locally in your browser, so your audio is not sent to a server.
What bitrate should I choose?
For speech, 64-96 kbps is often enough. For podcasts, 96-128 kbps is common. For music, start around 128-192 kbps.
Can I compress audio to a specific size?
Yes. Use Target Size mode and enter the MB value. The result is an estimate, so leave a small margin below strict platform limits.
Why is my compressed file still large?
The source may already be compressed, the duration may be long, or the chosen bitrate may still be high. Try mono for voice or a lower bitrate.
Does it work on phones?
Yes, modern mobile browsers can run the tool. Very large files may be slower on phones than on a desktop browser.