Compress PDF — Reduce File Size Online
Shrink your PDFs by up to 80%. Fast, free, and private.
Drop your PDF here or click to upload
Max 10 MB · Free: 2/day
Files are processed in your browser and never uploaded to our servers.
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Frequently Asked Questions
How does PDF compression work?
PDFWisp rewrites the PDF structure in your browser, removing redundant objects and optimizing the internal data. This can significantly reduce file size without visible quality loss.
Is my file safe?
Yes. Your PDF is processed entirely in your browser using JavaScript. The file never leaves your device — it is not uploaded to any server.
What is the maximum file size?
Free users can compress PDFs up to 10 MB. Pro users can process files up to 100 MB.
Will compression reduce the quality of my PDF?
The compression process optimizes the PDF structure without removing content. Text and vector graphics remain unchanged. Image quality may be slightly reduced in high-compression mode.