Why this compressor doesn't need your file
Shrinking a PDF is exactly the kind of job people hesitate to do online, because the files that most need compressing — scans of IDs, signed agreements, medical imaging reports — are the ones you least want on a stranger's server. This page solves that the direct way: the compression engine ships to your browser, and the work happens entirely on your device. Nothing is transmitted; there is no server-side copy to worry about, delete, or trust anyone with.
How the size reduction actually works
Big PDFs are almost always big because of images — a phone scan at full resolution can push a three-page document past 20 MB. This tool re-renders each page and re-encodes it at a controlled quality and resolution, which is where the savings come from. You choose how aggressive that trade is:
- Light keeps pages near their original sharpness and typically trims a modest amount — right when quality matters more than size.
- Balanced is the everyday setting: pages stay crisp on a screen while file size drops substantially on image-heavy documents.
- Strong targets hard limits — the 2 MB portal cap, the fussy email gateway — and accepts visible softening in exchange.
You always see the before and after size in plain numbers before you keep anything. And if the rebuild would come out larger than your original — which happens with already-optimized, text-only PDFs — the tool says so and tells you to keep the original, instead of handing you a worse file.
Reduce PDF size for email, portals, and forms
The most common reasons a PDF needs to lose weight: email providers commonly reject attachments over about 20–25 MB; job and government application portals often enforce limits between 1 and 10 MB; and visa and licensing systems can cap individual documents at a few hundred kilobytes. For those very tight kilobyte targets, run Strong compression here, and if you're still over the cap, split the document into smaller parts with the Split PDF tool and compress each part.