Compress PDF Online

Optimize PDF structure and embedded resources to reduce file size, free and private.

Compresses images and removes redundant data
Batch-compress multiple PDFs at once
Shows before/after file size comparison
No uploads, your files stay on your device

NilPDF Compress shrinks PDFs by optimising image data and removing redundant cross-reference tables, all inside your browser. No account, files up to 200MB supported, no waiting for a server to process your files. Simply drop your PDF, click compress, and the smaller file downloads instantly.

Your files stay on your device. They are processed entirely inside your browser using WebAssembly. Nothing is uploaded to any server. NilPDF has no backend, there is no server to send your files to.

Frequently Asked Questions

Is compressing a PDF really free?

Yes, completely free, unlimited use, no account required.

Are my PDF files safe when I compress them?

Your files never leave your device. All processing happens in your browser using WebAssembly (Pyodide). NilPDF has no server, there is nothing to upload to.

How much will my PDF shrink?

It depends on the content, PDFs with large images typically compress 30-70%. Text-only PDFs compress less.