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Free PDF Compressor - Use Online Without Installing
WebOptimize and reduce PDF file size in your browser
Run in your browser
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Choose a PDF to optimize
Handy next tools
Tools people often use together with this one.
How to use this tool
- Choose a PDF and run optimization.
- Compare the original and result sizes.
- Open the output to make sure pages still display correctly.
Real-world uses
- Resave a text-heavy PDF before emailing it.
- Remove avoidable structural overhead from a document.
What to check
- This resaves PDF structure; it does not recompress the images in a scanned document.
- An already optimized PDF may not get smaller.
Common problems and fixes
- The size barely changed
- For image-heavy scans, reduce the source images before rebuilding the PDF.
File and input privacy
The PDF is resaved locally in your browser, not uploaded to ToolMarket.
Questions about this tool
Is a smaller file guaranteed?
No. A photo-heavy or already optimized PDF can remain the same size or grow slightly.
Practical guides
- Why a PDF May Not Get Smaller →
Understand the difference between resaving PDF structure and shrinking scanned images.
- Reduce Image Size without Guessing at Quality →
A sensible order for adjusting pixels, format, and quality.