Compress PDF
Dramatically reduce file size for image-heavy documents.
Click to upload or drag & drop
Add your document. It will remain locally on your device.
Configuration
Lower quality results in smaller file sizes.
Shrink file size without sending your document to the cloud
Most online PDF compressors need to upload your file to shrink it — Foldr renders each page to canvas and re-encodes it as an optimized JPEG locally, then rebuilds the PDF, all inside the browser tab you're already in.
You choose the balance between file size and visual quality with a three-step compression level, which is especially effective on image-heavy scans and exports.
How it works
- 1
Upload the PDF you want to shrink.
- 2
Pick a compression level: Low Size, Balanced, or High Quality.
- 3
Run the tool — you'll see the size before and after, and the compressed file downloads automatically.
This tool never uploads your file. All processing happens locally in your browser using WebAssembly. Read more about how Foldr handles your data.
Frequently asked questions
Will compressing reduce text sharpness as well as images?
Each page is re-rendered as an image at the resolution scale tied to your chosen quality level, so very high compression can soften fine text. "High Quality" mode keeps a higher render scale for documents where legibility matters most.
Is there a file size limit for compression?
There's no server-imposed limit — processing happens in your browser, so the practical ceiling is your device's memory rather than an upload cap.
Why is my PDF still large after compressing?
PDFs made mostly of vector text and thin line art don't shrink much, since the size overhead usually comes from embedded raster images rather than text.