Compress Audio to Target Size
Select a size preset or enter a custom target, then compress audio files to fit.
or drop files here
Maximum file size: 200MB per file
Supported Formats
Supports all common audio formats. Output format can be selected below.
Supported input: MP3, WAV, OGG, AAC, M4A, FLAC, and more
Supported output: Original, MP3, WAV, OGG, AAC
How to Compress :format Files
Select :format Files
Click the upload button or drag and drop your files into the upload area. You can select multiple files at once.
Compress Files
Click the "Compress All Files" button. Our tool will process each file and show you the compression results in real-time.
Download Compressed Files
Download your compressed files individually or all at once as a ZIP archive. Your original files remain unchanged.
Frequently Asked Questions
How do I compress an audio file to an exact size like 1MB?
Upload your file, enter 1MB as the target, and start compression. Multi-pass optimisation adjusts the bitrate until the output lands at or just under 1,048,576 bytes. A 3-minute song needs roughly 45 kbps to fit, which keeps speech clear and music acceptable.
Which audio formats can I compress?
MP3, WAV, OGG, AAC, M4A, FLAC, and most other common formats are supported as input. Output is encoded to MP3 or OGG for maximum compatibility. Because everything runs in your browser, even large files of several hundred megabytes can be processed without upload waits.
How much quality do I lose when compressing audio?
It depends on target size versus duration. A 3-minute song at 5MB gets roughly 227 kbps, which sounds nearly identical to the source. At 1MB the same song drops to about 45 kbps, where artefacts appear in music but spoken content remains clear.
What bitrate will my audio get after compression?
The tool divides your target size by file duration to calculate the needed bitrate, then fine-tunes it in multiple passes. A 4-minute track targeted at 10MB lands near 340 kbps, while the same track at 1MB drops to around 34 kbps.
Can I compress a WAV file under 5MB?
Yes. WAV files are uncompressed, so a 3-minute stereo track is often over 30MB. Targeting 5MB converts it to a compressed format at roughly 225 kbps, cutting the size by about 84% while keeping quality high enough for most professional uses.
Are my audio files uploaded to a server?
No. All compression runs locally in your browser using JavaScript, so your audio never leaves your device. Sensitive recordings stay private, and there are no upload or download delays. Once the page has loaded, compression even works without an internet connection.
How long does it take to compress an audio file?
A typical 5-minute song compresses in about 5-15 seconds on a modern computer since processing is done locally. Large files like 50MB WAV recordings may take up to a minute. Multi-pass encoding adds a few seconds but guarantees you hit the exact size.
What is the smallest target size supported?
You can enter any custom target, even 100KB. Bear in mind that 100KB allows under 5 kbps for a 3-minute track, which is unusable, so practical minimums are around 500KB for short 30-60 second voice clips and 1MB for full songs.
Learn more about this tool
About Audio Target-Size Compression
Need your audio files under a specific size limit? This tool uses multi-pass bitrate optimization to compress audio to your exact target size. Supports MP3, WAV, OGG, AAC, M4A and more. All processing happens in your browser — your files never leave your device.Before emailing a PDF, open the downloaded copy and check fine text at the intended viewing size. The tool can reduce image detail; its target size is not guaranteed. If forms, signatures or searchable text matter, keep the original PDF.
Compress audio
Lower bitrate reduces size with a possible loss of detail. Re-encoding already compressed audio can also make it larger.
There is no guaranteed saving or exact target for every file. If the result is larger, some tools return the original; compare its format and size before sharing. Before emailing a PDF, open the downloaded copy and check fine text at the intended viewing size. The tool can reduce image detail; its target size is not guaranteed. If forms, signatures or searchable text matter, keep the original PDF.
References & Resources
Authoritative specifications and references for the file formats this tool works with.
Audio and video tools for compression, editing, extraction, and size reduction. Fast and secure.