Compress a PDF for free
Shrink large PDFs — scanned documents, image-heavy reports, portfolios — so they fit email and upload limits. ToolCrix runs the real Ghostscript engine compiled to WebAssembly entirely in your browser, so your PDF is never uploaded. It typically cuts size by 50–80% by downsampling and re-compressing the images inside the file.
How to do it
- Drop your PDF above (or click to browse).
- Pick a level: Smallest (72 DPI), Balanced (150 DPI, recommended) or High quality (300 DPI).
- Click Compress PDF — the engine loads once (~15MB, then cached) and the smaller file downloads.
Why compress PDFs in your browser?
Other compressors upload your file to a server and cap free use. Here the work happens on your device, so it's private (verify it in DevTools — zero upload requests), unlimited and free. The first compression downloads the engine; after that it's instant and works offline.
Frequently asked questions
How much smaller will my PDF get? Usually 50–80% for image-heavy or scanned PDFs; text-only PDFs are already small and may shrink little.
Will it reduce quality? Balanced (150 DPI) is the sweet spot — on screen it looks identical. Use High quality for print.
Is my PDF uploaded? No — everything runs locally in your browser with Ghostscript-WASM.
Is it free? Completely — no sign-up, no watermark, no limits.
Need more? Use the full PDF Toolkit to merge, split, rotate and convert.