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 Use This Tool
Select Your Files
Click upload or drag your files into the area. Multiple files can be queued for batch processing — useful for bilingual document sets.
Start Processing
Adjust the settings and start. All processing stays in your browser, keeping your files private and consistent with Canadian privacy expectations.
Download the Results
Download files individually or all at once. Your originals remain unchanged, ready for cross-border sharing or government portal uploads.
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 optimization 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 artifacts 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 compute 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. Keep 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.
Related Tools
Compress FLAC
Compress FLAC audio files in your browser. Reduce FLAC size by up to 80% with quality-controlled re-encoding — free, private, no upload.
Compress Video by Size Limit
Compress videos to platform size limits like 8MB, 10MB, 25MB, 50MB or custom targets in your browser.
Compress MP3
Reduce MP3 file size by up to 80% while maintaining audio quality. Free online MP3 compressor - 100% browser-based, no upload required.
Compress WAV
Reduce WAV file size by up to 90% while maintaining audio quality. Free online WAV compressor - 100% browser-based, no upload required.
Compress OGG
Reduce OGG file size by up to 80% while maintaining audio quality. Free online OGG compressor - 100% browser-based, no upload required.
Compress AAC
Reduce AAC file size by up to 80% while maintaining audio quality. Free online AAC compressor - 100% browser-based, no upload required.
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. Whether you are preparing bilingual English and French documents, submitting files to CRA and Service Canada, or collaborating cross-border with US teams, this tool keeps your files lean and aligned with Canadian privacy expectations — nothing leaves your device.
References & Resources
Authoritative specifications and references for the file formats this tool works with.