Compress PDF to 800KB

Drop your PDF into the box above and press Compress. The tool is already set to a 800KB target, so it automatically applies the lightest compression that gets you under 800KB, then hands you a download link. The whole process happens on your own device.

Most can. Text-heavy documents compress dramatically. Very long scanned documents — say 100+ pages of high-resolution photographs — may not reach 800KB while staying readable. In that case we return the smallest usable version and tell you the target was missed, so you can split the document instead.

We always try the gentlest setting first and only escalate if the file is still too large. For typical business documents at 800KB, text stays perfectly sharp because it remains real vector text — only embedded images are downsampled.

Progress tracks pages completed, not time elapsed, and pages differ enormously in cost. A page holding one large photograph takes far longer than ten pages of plain text, so the bar appears to stall. It is still working — the Web Worker keeps the interface responsive throughout.

Both, layered. Structural optimization — removing duplicate objects, dead revisions and metadata — is entirely lossless. Image downsampling and JPEG re-encoding are lossy, which is where the substantial savings come from. Text and vector graphics are never touched by either stage.

You can compress them, but be aware that any modification to a PDF invalidates its cryptographic signature — this is true of every compression tool, not just ours. If the signature must remain valid, do not compress the signed document.

Rarely, and it is usually counterproductive. The first pass already removes structural waste and downsamples images; a second pass mostly re-encodes already-degraded JPEGs, which loses more quality for negligible gain. Prefer a stronger preset on the original file instead.

Any modern browser with WebAssembly support: Chrome, Edge, Firefox, Safari, Brave, Opera and Arc, on desktop and mobile. Chromium-based desktop browsers are typically the fastest for very large documents.

There is no page-count limit. The practical constraint is memory rather than pages: a 500-page text document compresses easily, while a 500-page high-resolution scan may exhaust memory on a lower-spec machine. Closing other tabs frees up headroom for very large jobs.

No. Compression runs entirely inside your browser using WebAssembly. Your PDF is read into local memory, processed on your own CPU and written straight back to your downloads folder. No network request ever carries the file.