Your file is processed on your device and is never sent to any server.
Bring a large PDF under 1 MB for an upload form or email without making it unreadable. Free, no sign-up, and processed entirely in your browser.
1 MB keeps 9 text-heavy pages sharp and 24 pages readable. Certificates, which have more white space, fit better: 16 sharp, 39 readable. Phone photos of a page behave much like text scans: 9 sharp, 24 readable.
| Document | Pages kept sharp (about 100 DPI) | Pages kept readable (about 70 DPI) | One page reaches |
|---|---|---|---|
| Text-heavy scan (A4, greyscale, 150 DPI) | 9 | 24 | full scan resolution (150 DPI) |
| Certificate scan (A4, colour, 200 DPI) | 16 | 39 | about 154 DPI (the tool's highest setting) |
| Phone photo of a page (12 MP) | 9 | 24 | about 154 DPI (the tool's highest setting) |
Dropping to 800 KB costs about 5 readable text pages.
How we measured: this page's own compressor was run on three test documents of 1 to 30 pages, and the largest page count that stays under 1,000,000 bytes was recorded at each quality level. Your scans will differ with paper, ink and scanner, so treat these as a guide.
In our measurements, about 24 text-heavy scanned pages at readable quality (9 kept sharp), or 39 certificate pages. A single page reaches about 150 DPI.
Most scanned PDFs can. The tool shrinks the images inside the PDF, so it works best on scans and photos; a PDF that is mostly text or vector drawings has little to remove, and the tool tells you the smallest size it could reach.
A single text-heavy A4 page keeps about 150 DPI at 1 MB in our measurements: sharp. Real text in a PDF (not a scan) is left untouched and stays sharp and selectable at any size.
It is the largest file the tool can produce that is still under the target, so you keep as much quality as the limit allows. It aims below 1,000,000 bytes, so it passes whether a portal counts a kilobyte as 1,000 or 1,024 bytes.
No. Compression runs in your browser on your own device. Nothing is sent to a server, which matters for ID cards, certificates and mark sheets.
Then you do not need to compress it. Check the portal's minimum as well: some portals reject files that are too small, not only too large.
Updated