Compress PDF
Reduce PDF file size by re-encoding pages, with an honest before-and-after.
Runs entirely in your browser.
Your data never leaves this device and is never sent to our servers.
Drop a PDF to compress
or click to choose a file · processed on your device
Two approaches, with different consequences. Optimise structure rewrites the file and strips unused objects — completely lossless, but the saving is modest and sometimes nil. Rasterise renders each page to a compressed image, which shrinks scanned documents dramatically but turns selectable text into a picture.
The result and the saving are shown before you download, so you are never guessing.
How to use it
- Drop in your PDF.
- Choose lossless optimisation or rasterising.
- Check the size comparison, then download.
Not working as you expect? Report a problem with this tool.
Frequently asked questions
Why did lossless mode barely help?
Because the file was already efficient. Most of the size in a text PDF is fonts and content streams, which cannot be shrunk without discarding something.
When should I rasterise?
For scanned documents, where the pages are already images. Never for a document whose text needs to stay searchable or selectable — rasterising destroys that.
Is my PDF uploaded?
No. Everything happens in your browser.