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Size up to 100 MB · PDF · one file at a time, processed entirely in your browser
Mode
Image quality: 65%
"Maximum compression" re-renders each page as an image, which is why it shrinks scanned/image-heavy PDFs a lot but makes the text non-selectable. Use "Quick optimize" if you need to keep the PDF's text and links intact.
How to Use This Tool — Q&A
Is my PDF uploaded to a server?
No — both compression modes run fully client-side using pdf-lib and pdf.js in your browser. Your file never leaves your device.
Which mode should I use?
Try 'Quick optimize' first — it keeps text selectable. If the file is still too large (common with scanned documents full of images), switch to 'Maximum compression'.
Why does Maximum Compression make text non-selectable?
That mode rebuilds the PDF from a flattened image of each page, the same technique scanner apps use. It's the most reliable way to shrink image-heavy PDFs in the browser, but any real text becomes part of the image.
Will this work on very large PDFs (100+ pages)?
It can, but browser memory becomes the limiting factor. For huge files, try a lower image quality or process in smaller batches.