Free Online Tool
Audio Compressor
Choose your own MP3, WAV, OGG, or FLAC audio file and reduce its size in your browser. MP3 and OGG are lossy compression outputs, while FLAC keeps lossless audio with limited size reduction.
Selected audio files are not uploaded to a server and are processed only in your browser.
Only use audio files that you own or have the right to convert. Do not convert or distribute copyrighted files without permission.
MP3 and OGG output reduce size with lossy compression. FLAC output keeps lossless audio and adjusts compression level, so size reduction may be limited.
Original Preview
Compressed Preview
Choose an audio file to see details.
The result will appear here.
Selected audio files are not uploaded to a server and are processed only in your browser.
Compression Choices
- Lower MP3 bitrate for speech sharing
- 192kbps or higher MP3 for music with reasonable quality
- FLAC compression level when lossless output is required
Bitrate and File Size
Lower bitrate can reduce size but may damage high frequencies, space, and background detail. FLAC compression level affects encoding time and file size, not sound quality.
How to Use
- Choose an audio file to compress.
- Select a compression preset or bitrate.
- Choose the output format.
- Choose a FLAC compression level for FLAC output.
- Click the compress button.
- Check the result and download the compressed file.
Examples
- Compress a FLAC file to MP3 to reduce file size
- Recompress FLAC with a smaller-file compression level
- Reduce a 320 kbps MP3 file to 128 kbps
- Compress a voice recording to 64 kbps mono
Calculation and Conversion Notes
Audio compression works by decoding the selected audio file in the browser and re-encoding it using the selected output format and compression settings. MP3 and OGG can reduce file size at lower bitrates, but audio quality may decrease. FLAC is lossless, so higher compression levels do not change quality; they affect encoding time and file size. The reduction rate is calculated as `(original size - compressed size) / original size × 100`. Selected files are not uploaded to a server and are processed only in your browser.
When Size Does Not Decrease
Files that are already short or low bitrate may not shrink much. WAV sources often shrink significantly when converted to MP3 or OGG.
FAQ
What happens when bitrate is lowered?
File size can decrease, but quality loss can increase. Speech and music need different settings.
Is FLAC compression level a quality setting?
No. FLAC remains lossless; compression level affects encoding time and file size.
Can the compressed result be larger?
Yes. Depending on the source and output settings, the result can be larger than the original.
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