Compress PDF Online

Reduce PDF file size without losing quality — 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, no size limits, no waiting for a server to process your files. Simply drop your PDF, click compress, and the smaller file downloads instantly.

100% private. Your files 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.