Compress PDF
Shrink a PDF so it fits an email or upload limit — entirely in your browser. Works best on scanned and image-heavy documents. Nothing is uploaded.
Drop a PDF here
or pick one from your device — it stays on your device
Select PDFHow to compress a PDF
Add a PDF
Drop in the document you need to make smaller.
Pick a level
Smallest for the tightest size, or higher quality to keep more detail.
Download
See the before/after size and save the smaller file.
How this compressor works
This tool re-renders each page and re-encodes it as an optimised image inside the new PDF. That's why it's most effective on scanned documents and image-heavy PDFs, where the images are the bulk of the file size. A PDF that's mostly selectable text is usually already compact and may not shrink much — and note that re-rendering converts pages to images, so text in the output is no longer selectable.
Everything happens in your browser using WebAssembly. Your file is never uploaded, so even confidential documents stay on your device.
Frequently asked questions
Is my PDF uploaded?
No. Compression runs entirely in your browser — you can confirm there are no uploads in the network tab.
Why didn't my PDF get smaller?
Text-only PDFs are already efficiently stored. This compressor helps most with scans and photos. If a file is already optimised, the result may be similar in size — in that case just keep your original.
Will the text still be selectable?
No. To compress heavily, pages are flattened to images, so selectable text and links are not preserved. Use this when a smaller file matters more than editability.