Compress PDF
Shrink file size while keeping it readable
Drop files here
or — you can also paste with ⌘V
One PDF file · up to 300 MB each
This tool runs entirely inside your browser. Your files are never uploaded, never stored, and never seen by anyone but you.
What actually gets compressed
Nearly all of a large PDF's weight is the images inside it. A scan is a photograph of every page; a report is text plus screenshots. The text itself takes almost no space at all.
So this tool finds the images embedded in the document and re-encodes those, and only those. Your text, fonts, links and vector graphics are not touched — they are not even read.
Why your text stays sharp and selectable
Most free PDF compressors take a shortcut: they render each page to a picture and rebuild the document from those pictures. It shrinks the file, and it quietly destroys it. Text stops being selectable, stops being searchable, and turns fuzzy the moment you zoom in. You do not notice until you try to copy a sentence.
This tool never does that. Because only the image streams are replaced, a text document that arrives searchable leaves searchable.
Nothing happened to my file
Then there was nothing safe to gain. A PDF that is mostly text is already tiny, and images that were already compressed hard will only get worse and bigger if run through again. When that happens the tool says so and tells you to keep the original, rather than handing you a new file that is no better.
Some images are also deliberately left alone: one-bit scans and stencil masks, which JPEG would smear, and formats like JPEG 2000 and JBIG2, which would need their own decoders. A document that came out smaller but broken is far worse than one that came out unchanged.
Which setting should I use?
Balanced for most things. Strong when you are fighting an email or upload limit and the document only has to be readable. Light when the images matter and you only want the easy saving.
The size cap usually does more than the quality slider. Scanned pages are frequently stored at several times the resolution anyone will ever view them at.
Is anything uploaded?
No. The document is opened, rewritten and handed back entirely inside your browser, in a background thread. Nothing leaves your device.