Compress PDF
Best for scanned PDFs or ones with lots of photos. Adjust quality and resolution to shrink the file.
100% private — your files are processed on your device and never uploaded to a server.
How it works
- 1
Upload your PDF
Drag the file you want to compress into the drop zone.
- 2
Adjust quality and resolution
Lower quality and DPI mean a lighter file, but less sharp images.
- 3
Compress and download
Tap "Compress PDF" and see how much the size was reduced before downloading.
How honest PDF compression works
Most "PDF compressors" promise to shrink any file, but technically that isn't always possible — a text-based PDF is already very efficiently packed internally. What actually reduces file size is converting each page into an image and re-compressing it at your chosen quality — which is why this tool works best on scanned PDFs, photographed forms, or documents with lots of photos.
Before processing, we analyze how much selectable text your document has. If it looks mostly text-based, we warn you: compressing it would turn it into images, making it bigger and removing selectable/searchable text. You decide whether to continue.
Frequently asked questions
Why can't my text-based PDF be compressed well?
Because text in a PDF already takes up very little space internally. Compressing these documents would require converting them into images, which usually makes them bigger and removes selectable text.
What resolution (DPI) should I choose?
150 DPI is a good balance for most scanned documents. Go down to 100 DPI if you need the smallest possible file and don't mind losing sharpness; go up to 200 DPI if the document has small text you need to read clearly.
Do I lose selectable text when compressing?
Yes, always — this tool rasterizes each page as an image. If your PDF is mostly text, we warn you before processing so you can decide.
Are my documents uploaded to a server?
No. The entire process — reading, rendering and re-compressing each page — happens in your browser. Your files are never uploaded anywhere.