Compress Scanned PDF

Scans are big because every page is a picture. This page starts with Black and white on, which makes scanned text much smaller. Your PDF stays on your device.

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Drop a PDF here or tap to choose
Scans, forms, certificates, photos in a PDF. Nothing is uploaded: it all happens on your device.

Compress Scanned PDF: free online tool

A scanner or a scanning app saves each page as a large picture, so a short scanned document can easily be several MB. This page is set up for that case: black and white is already switched on, and the pages are saved at a lighter setting.

Add your scan, press Compress PDF, check the first-page preview and download. If you need a particular size, tick "I need an exact size" and type it.

How to compress a PDF

  1. Drop your PDF on the box or tap it to choose a file.
  2. Choose how small you want it: Light, Recommended or Smallest. For a form with a size limit, tick I need an exact size and type it.
  3. Press Compress PDF and wait a moment while the pages are processed.
  4. Check the before and after sizes and the first page, then press Download PDF.

Tips

  • Black and white is best for text, forms and certificates. Untick it if the scan has photos or colour stamps that matter.
  • Scan at about 200 dpi if you can. Higher scans make heavy files and do not look better on a screen.
  • Check small print in the preview before you upload the file anywhere.

Compress Scanned PDF: common questions

Each page of a scan is a full photo of the paper, often at a very high resolution. A few pages can add up to many MB. Compressing lowers the resolution and quality of those pictures.

Yes at the Recommended level for normal print. Very small or faint text can get harder to read at the Smallest level, so look at the preview first.

No. The pages are saved as pictures, so the text cannot be selected or searched, just like in most scans.

Yes. It is free, needs no account, has no daily limit and does not add a watermark.

No. The PDF is opened and rewritten inside your browser. It never leaves your device, so private documents stay private.

Tick "I need an exact size", type 200 (or 100) and choose KB, then press Compress PDF. The tool tries stronger and stronger settings until the file is under your limit. A very long PDF may not reach a very small limit, so try Black and white too.