Compress PDF
Instantly reduce PDF file sizes without sacrificing readability, by restructuring how the PDF stores its internal data more efficiently.
Compress PDF tool
100% Privacy
Files stay strictly on your device. Zero server uploads.
Instant Speed
Local browser WebAssembly & JS processing engine.
Free Forever
Unlimited usage with no hidden fees or watermarks.
How to Compress a PDF
Upload PDF
Drag and drop or click to upload your PDF file.
Compress
Click compress to reduce the file size in your browser.
Download
Download your compressed PDF immediately.
Start using Compress PDF now – it’s completely free and works instantly in your browser.
Frequently Asked Questions
Is PDF compression free?
Yes, completely free with no file count or size limits.
Will quality suffer?
No. Compression restructures how the PDF stores its internal data more efficiently rather than re-rendering or degrading your text and images, so readability is unaffected. Size reduction depends on how the original file was saved — a PDF with a lot of redundant internal structure shrinks more than one that's already efficiently saved.
Will it shrink a scanned or image-heavy PDF a lot?
Usually not by much — this tool doesn't recompress or downsample the images embedded in the PDF, only the document's internal structure. If most of the file size is embedded images, expect a modest reduction.
Is my PDF secure?
All processing happens in your browser. Files are never uploaded to servers.
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