Compress PDF Online
Shrink your PDF without losing a single pixel of quality. Everything happens in your browser — files are never uploaded anywhere.
Perfect for slipping a document under an email attachment limit or a stubborn form upload cap. The rebuild is completely lossless — redundant objects are stripped and the cross-reference data is packed tight, while every image and glyph comes through untouched. Text and vector-heavy PDFs shrink the most; scans, already compressed, move very little. No account, no watermark, no server round-trip.
How to compress a PDF
- Open your PDF. Drag the file onto the drop zone, or click it to browse.
- Compress it. Click Compress PDF. The document is rebuilt to drop redundant objects and pack its cross-reference data.
- Check the saving and download. The new size is shown next to the original, so you know exactly what you saved before you download anything.
Frequently asked questions
How much smaller will my PDF get?
It depends entirely on what's inside. Text and vector-heavy PDFs — reports, invoices, exports from Word or LaTeX — often shed a satisfying chunk, because those are the files that accumulate the most redundant structure. Scanned and photo-heavy PDFs barely move, since almost all of their bulk is already-compressed image data. The tool shows you the before and after side by side, so you never have to guess.
Does compressing reduce quality?
Not in the slightest, and that's the whole point of this one. Nothing is re-rendered, re-sampled, or re-encoded — every image, glyph, and vector comes through bit-for-bit identical. The saving comes purely from rebuilding the file's internal structure: dropping objects nothing references any more and packing the cross-reference tables. Your PDF gets smaller; your pixels are never touched.
Why don't my scanned PDFs shrink much?
Because their weight is embedded JPEG data, and shrinking that means re-encoding it at a lower quality — visibly degrading your document. A browser can't do that well, and we'd rather hand you a file that's honestly the same size than one that's quietly blurrier than the one you started with. If you need a scan dramatically smaller, reducing its resolution in a dedicated image tool is the route that actually works.
Is my PDF uploaded to compress it?
Never. Compression runs entirely in your browser — the file never leaves your device, so even a confidential document is safe to drop in.