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Compress PDF

Reduce the size of your PDF files while maintaining good quality.

⚠ Important: Target size ≠ Actual output size The slider sets a target, but PDF compression is not linear. The actual output size will usually differ from the target. This is normal. ✔ Recommended first step Start with 10% and check the output size and image resolution. If the file is still too large, increase the slider gradually (20% → 30% → 40%…) until you reach a good balance between size and quality. Use the Reprocess with New Options button — no need to re-upload.
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Upload your PDF

Choose a PDF file to compress

0% 20% 40% 60% 80% 90%
Original file size: —
Target output size: —
Target reduction: 50%
Recommended balance between size and quality.

✓ PDF Ready

Your compressed PDF is ready.

Download Compressed PDF

Compress PDF Online

Reduce the file size of a PDF online with DocumentTools. Upload your PDF, choose a compression level, and download the compressed file when processing is complete.

How to compress a PDF

  1. Choose the PDF file you want to compress.
  2. Select a compression level based on the balance you want between file size and quality.
  3. Click Compress PDF and wait for processing to finish.
  4. Download the compressed PDF.

PDF compression features

Frequently Asked Questions

What does PDF compression do?

PDF compression reduces the file size of a PDF so it can be easier to store, upload, or share.

Will compression change PDF quality?

The result depends on the selected compression level and the contents of the PDF. Higher compression can reduce file size more but may affect image quality.

Can I compress the same PDF again?

Yes. After processing, you can use the reprocessing option to try a different compression level without uploading the file again.