Audio Compressor
Free online MP3 compressor and audio file size reducer. No signup, no upload to servers.
Shrink audio files by up to 90% with this free online audio compressor. Reduce MP3, WAV, AAC, OGG, and FLAC file sizes by choosing your preferred bitrate. All compression happens directly in your browser for complete privacy. Only have MP3 files? Try our dedicated MP3 compressor with 320kbps support. Need to trim audio or extract audio from video first? We have tools for that too.
Drop audio files here
or click to browse
Supports: MP3, WAV, AAC, OGG, FLAC
How It Works
- 1Upload audio files
Click or drag and drop your audio files. Supports MP3, WAV, AAC, OGG, and FLAC formats.
- 2Choose bitrate
Select your preferred bitrate: 64kbps (low), 128kbps (medium), or 192kbps (high).
- 3Compress and download
Click Compress Audio to shrink your files. Download the compressed MP3 files with reduced file size, ready to share or upload anywhere.
Tip: Need to cut your file first? Use the Audio Trimmer before compressing.
Why Use This Audio Compressor
Most online audio compressors upload your files to remote servers for processing. This tool is different. It runs entirely in your browser using WebAssembly (FFmpeg compiled to WASM), so your audio never leaves your device. No server uploads, no data collection, no privacy risk.
This makes it ideal for compressing sensitive audio like voice recordings, interviews, client calls, or any audio you want to keep private. The FBI has warned about unsafe file converters that steal data. Our browser-based approach eliminates that risk entirely. You can check if any converter is safe with our free safety checker.
Who Uses This Tool
- Podcasters who need smaller MP3 files for hosting platforms with storage limits
- Musicians and producers sharing demos or rough mixes via email
- Students compressing lecture recordings to save phone storage
- Content creators preparing audio for Discord, WhatsApp, or social media uploads
- Businesses reducing audio file sizes for email attachments (most email providers cap attachments at 25MB)
Bitrate Guide
Bitrate controls the tradeoff between file size and audio quality. Lower bitrate means smaller files. Here is a quick reference for choosing the right bitrate:
- 64 kbps - Best for voice-only content: podcasts, audiobooks, phone recordings. Cuts file size by 80-90%.
- 128 kbps - Good for most music. Standard streaming quality. Reduces files by 50-70%.
- 192 kbps - Near-transparent quality for critical listening. Smaller reduction but preserves more detail.
For even more control over MP3 compression, try our dedicated MP3 compressor which supports up to 320kbps output.
Frequently Asked Questions
What audio formats can I compress?
We support MP3, WAV, AAC, OGG, and FLAC audio formats. All files are compressed and output as MP3 format for maximum compatibility across devices. If you need to convert between formats without compressing, try our WAV to MP3 or MP3 to WAV converters.
Which bitrate should I choose?
64kbps (low) is best for voice recordings and podcasts. 128kbps (medium) is recommended for most music and offers a good balance. 192kbps (high) provides better quality but larger file sizes.
Is my audio uploaded to a server?
No. All audio compression happens directly in your browser using WebAssembly. Your audio files never leave your device, ensuring complete privacy and security. Not sure if a converter you are using is safe? Try our file converter safety checker.
How much can I reduce file size?
File size reduction depends on the original file and selected bitrate. You can typically reduce file sizes by 50-90%, especially when compressing high-quality WAV or FLAC files to MP3. We also offer tools to compress video and compress images.
Can I compress multiple audio files at once?
Yes. You can upload and compress multiple audio files in a single batch. All files will be processed with the same bitrate setting, and you can download them individually or all at once.
Is this tool free to use?
Yes. This audio compressor is completely free with no hidden charges, subscriptions, or signup required. Use it as many times as you need.
Can I compress audio for email attachments?
Yes. Gmail limits attachments to 25MB and Outlook to 20MB. Compressing a WAV file at 128kbps typically reduces it by 80-90%, making it small enough for email. For video attachments, try our compress video for email tool.
Does compressing audio reduce quality?
Compressing audio is lossy, meaning some quality is lost. At 128kbps most people cannot tell the difference from the original. At 64kbps the quality drop is more noticeable but still fine for voice recordings. For lossless audio, keep your original WAV or FLAC files.
How do I compress audio for Discord?
Discord limits file uploads to 10MB on free accounts and 50MB with Nitro Basic. Upload your audio file here, select 128kbps or 64kbps bitrate, and compress. The output will usually be well under Discord's limit. See our full guide on compressing audio for Discord.