Free · no limits · nothing uploaded
Compress audio – WAV to MP3 in bulk
Turn huge WAV, FLAC and AIFF recordings into small MP3s that play everywhere – voice memos, podcasts, jingles, sound logos. Whole folders at once, nothing uploaded.
- Runs in your browser
- Folder structure kept
- No sign-up
- No file limit
Settings Defaults work for most files
Videos are re-recorded in real time. Keep this tab in the foreground, otherwise it slows down.
Before / after
From 50 MB to 5 MB
A three-minute WAV in CD quality is about 30 MB. As a 128 kbps MP3 it is under 3 MB and sounds the same on laptops and phones. Shrinkfold uses the LAME encoder – the reference for MP3 – directly in your browser.
Presets for voice and music
“Voice & podcast” saves mono at 64 kbps – perfect for interviews, voice notes and audio books. For music choose 128, 192 or 320 kbps.
Why Shrinkfold
Built by people who send heavy files every day
Folders stay folders
Drop a whole project folder or ZIP. You get the same structure back – nothing to re-sort, no renamed chaos.
Smarter PDF compression
Instead of crushing the whole file, every image is resized to its real size on the page. Text, vectors and plans stay crisp.
Private by design
Everything runs locally in your browser. Your files never touch a server – perfect for NDAs and client work.
No limits, no account
No file caps, no daily quota, no watermark, no sign-up. Free, funded by friendly local ads.
How it works
Three steps, zero uploads
Drop
Files, folders or a ZIP – images, PDFs, videos and SVGs together.
Shrink
Pick a target like “email under 10 MB” or keep the smart defaults.
Save
Download single files, one ZIP, or write straight into a folder.
FAQ
FAQ
How do I convert WAV to MP3?
Drop your WAV files (or a whole folder), keep “Standard: MP3 128 kbps” and press “Compress now”.
Which audio formats are supported?
Everything your browser can play: WAV, MP3, FLAC, M4A/AAC, OGG/Opus and AIFF (AIFF in Safari). The result is always MP3.
Does it keep the audio quality?
At 128 kbps and above most people can’t hear a difference on normal speakers. For mastering use 320 kbps or keep the WAV.
Is Shrinkfold really free?
Yes. No limits, no watermark, no account. We earn money with small, clearly marked local ads and a branded version for agencies.
Are my files uploaded anywhere?
No. Compression runs entirely in your browser on your own device. You can even disconnect from the internet after the page has loaded.
Is there a file size limit?
No artificial limit. The only limit is your device’s memory – modern laptops handle multi-gigabyte folders. For very large batches use “Save to folder” in Chrome or Edge.
Does it keep my folder structure?
Yes. Drop a folder or ZIP and the result has exactly the same sub-folders and file names – only smaller.
Will the quality get worse?
Text, fonts and vector graphics are never changed. Photos are re-compressed as little as needed: each image is measured on its own and resized only to the resolution its real size on the page requires. If compressing doesn’t save anything, you get your original back.
More tools
Running an agency?
Get Shrinkfold with your own logo, colours and presets – for your team and your clients.