Choose input
Choose a PDF.
PDF Compressor
Rewrite PDF objects and compare the saved file size.
Browser-only processing. Up to 50 MiB combined and 150 pages; 20 files for merging. Password protection, forms, signatures and attachments are unsupported.
Rewrites PDF objects. Images keep their existing resolution and encoding; file size can increase.
Last reviewed: · Testing methodology
Use this in a task
Choose a task to see when this tool helps and which steps you can skip.
Choose a Document Task →How to use
Choose compact object streams or a plain rewrite. The tool does not reduce image resolution or recompress images, and saved files can be larger.
Set options
Select save mode and rewrite.
Use the result
Compare actual size and inspect the downloaded pages.
Examples and checks
Worked example
Use the settings below and inspect the saved result.
- Input
- An ordinary three-page PDF; compact object streams
- Output
- A readable three-page rewrite with original text and visible content; size comparison reports the actual change
Limits and questions
Inputs are processed in your browser. Analytics and advertising can make separate network requests.
Supported behavior
Choose compact object streams or a plain rewrite. The tool does not reduce image resolution or recompress images, and saved files can be larger.
Limits and review
50 MiB and 150 pages. Forms, signatures, portfolios and attachments are rejected. Size reduction is not guaranteed.
Verification
Review record: 2026-08-26. See the documented behavior and limitations above, and the testing standards for the scope of review.
Testing methodologyWhen to use another workflow
Use Ghostscript, Acrobat, or a specialist compressor when you need image downsampling, font controls, archival profiles, or a target file size.
Frequently asked questions
- What are the limits?
- 50 MiB and 150 pages.
- What should I check before using the output?
- Forms, signatures, portfolios and attachments are rejected. Size reduction is not guaranteed.