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PDF Compressor

Reduce PDF file size in your browser

Client-side PDF compression rebuilds the PDF structure. Results vary by content.

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PDF Compressor: A PDF compressor reduces the file size of a PDF so it's easier to email, upload or store, while keeping it readable. Add a PDF, choose a compression level, and download the smaller file — processed in your browser.

Frequently Asked Questions

How do I compress a PDF?
Upload the PDF, pick a compression level, and click Compress. The tool optimizes embedded images and structure to shrink the file, then lets you download the smaller version.
Why is my PDF file so large?
PDFs are usually large because of high-resolution embedded images, uncompressed scans, or embedded fonts. Compressing re-encodes images to cut the biggest contributor to size.
Will compressing a PDF lower its quality?
Text stays sharp because it isn't image-based. Embedded images may lose slight detail at higher compression, but at moderate settings the document remains clearly legible.
Are my PDFs uploaded when compressing?
Compression is performed in your browser, so your documents stay on your device — keeping sensitive contracts and records private.

Go deeper

Read the SnoopTool guide behind this tool

The calculator gives you the number. These SnoopTool guides explain the method, the assumptions and the decision — with worked examples, data tables and FAQs.

Browse all SnoopTool guides →

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