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Compress PDF to 500 KB

Choose a PDF and get a copy under 500 KB, ready to upload.

Works on your device. Nothing is uploaded.

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Where 500 KB is asked for

500 KB is common for longer documents (a full mark sheet set, an experience bundle, a medical certificate with reports). Up to about 10 pages keep good detail at this size.

How to compress a PDF to 500 KB

  1. Tap Choose a PDF.
  2. Keep Maximum KB at 500.
  3. For printed text on white paper, tick Black and white: the file gets smaller and text stays sharper.
  4. Tap Make my file, then Open to check that every page reads clearly before you upload.

What happens to your PDF

Scanned PDFs are big because every page is a photo. The tool draws each page again at a resolution (DPI) and JPEG quality chosen so the whole file fits under 500 KB, starting at 150 DPI and stepping down only as far as needed. The new pages are pictures, so text in a typed PDF can no longer be selected or searched; it reads the same. If your PDF is already under 500 KB, the tool says so and you can upload the original.

Worked example

A 4-page scanned certificate of 3.1 MB with a 500 KB limit gives each page about 125 KB. That fits at about 120 to 150 DPI in colour.

Questions people ask

Is my PDF uploaded anywhere?
No. pdf.js and pdf-lib, two open-source libraries, run inside your browser. The file never leaves your phone or computer.
Why can I not select text in the compressed PDF?
To reach small sizes every page is saved as a picture. Forms only need the pages to be readable, which they are.
My PDF has a password. Can I compress it?
Remove the password first (open it, print to PDF, or use the issuer's option), then compress it here.
How many pages can I compress?
Up to 50 pages. For more than that, split the file first.

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