What is this PDF compress tool?
A free, browser-based tool that shrinks a PDF's file size so it's easier to email, upload, or store. There's nothing to install and no sign-up — and because everything runs locally in your browser, your file is never uploaded to a server.
How compression works (and the tradeoff)
This tool keeps the structure of your PDF intact and compresses only the images embedded in it, at the quality you choose. Text, vector graphics, and annotations are left untouched, so the text stays selectable and searchable after compressing. How much the file shrinks depends on how much image data it contains: a PDF with few images may not get much smaller. Use the quality slider to balance size against image sharpness.
How to compress a PDF
- Upload your PDF by dragging it in or clicking the upload area.
- Set the quality slider — lower means a smaller file, higher keeps more detail. The default (0.6) is a good starting point.
- Press “Compress & download”. The compressed size and the percentage saved appear in the control panel.
Common use cases
- Getting a heavy scanned document under an email attachment size limit.
- Uploading a PDF to a form or portal that rejects large files.
- Saving storage space when archiving image-heavy PDFs.
