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Compress PDF

Make a PDF smaller so it is easier to email and upload.

Free · No signup · Files stay on your device

or drop a file here

How to use Compress PDF

  1. 1Click the Select button and choose your file, or drag and drop.
  2. 2Fill in the options shown on the page.
  3. 3Press the Compress PDF button.
  4. 4Download your result.

Need more help? Read: How to Compress a PDF Without Making Text Unreadable

Your files stay private

Your file is processed on your own device. It is never uploaded to our servers.

Frequently asked questions

Is Compress PDF free?

Yes. ToolBox is 100% free. No signup, no watermark, no daily limit.

Are my files uploaded to a server?

No. All work happens inside your browser on your own device. Your files never leave your phone or computer.

Does it work on mobile?

Yes, on Android, iPhone, tablets and desktop. Very large files can be slow on older phones.

What are the limits of Compress PDF?

Basic mode only removes wasted space, so some files barely shrink. Strong mode gives smaller files but turns pages into pictures, so text cannot be selected.

More Optimize PDF tools

PDF to Grayscale

Convert colour pages to black, white and grey to save ink.

Crop PDF

Cut the same margin from every edge of every page.

PDF Page Size Converter

Resize all pages to A4, A3 or Letter.

PDF Image Optimizer

Shrink the pictures in a PDF to reduce its file size.

PDF File Size Checker

See the file size, page count and version of a PDF.