Compress Audio Files
Reduce audio file size with a lower bitrate. Create a smaller recording locally and compare the result before sharing.
Let’s compress audio.
Add audio files to get started.
Three steps. One less task.
- 01
Add the recording and enter your maximum size in KB, MB or GB.
- 02
Compress the file while keeping the browser tab open.
- 03
Check the actual size, output extension and sound quality before using it.
Good to know
Voice usually tolerates lower bitrates than music. Strong compression can introduce audible artifacts. Listen with headphones; compression cannot improve the source recording quality.
Compress an audio recording toward a size limit
When compression is required, the output is AAC audio in an M4A file. A source that already fits is returned unchanged in its original format. The processor reads the recording's duration, derives a bitrate from the size budget and makes up to three attempts; the result may still exceed the target.
Targets below 4,000 bytes per second of recording are rejected. Long recordings need a larger budget than short clips, and music can reveal compression artifacts more readily than simple speech. Trim unnecessary material first. If the destination requires MP3, convert the result afterward and check its size again because that conversion changes it.
A few things you might ask.
Why did my MP3 become an M4A?
This target-size compressor uses AAC in M4A when it re-encodes audio. It does not offer an MP3 output selector. An already-small MP3 is returned unchanged.
Why does the recording fail before compression begins?
The browser must read its duration, and the source codec must be decodable. A damaged file, unsupported audio variant or source above the 250 MB browser limit can prevent processing.
Which source files can I try?
The file picker accepts MP3, M4A, WAV, OGG, FLAC and AAC. Sources above 250 MB are rejected. The container extension alone does not guarantee that its codec can be decoded; use a shorter recording or another source export if processing fails.
Are my files uploaded to a server?
This tool processes files on your device. Moving a file between Fitabyte tools uses a one-use browser handoff that expires after 10 minutes; abandoned handoffs are cleared on your next visit. Your original stays unchanged.
Can I use this tool on my phone?
Use a current browser and keep the tab open during processing. Available memory and processing speed depend on your device; start with a smaller file for large PDFs or video.