Open Doc Tools

Compress a PDF to 200 KB

200 KB is the most common cap on a single scanned document, and it is a size a properly scanned page fits in without looking bad.

Runs in your browser — nothing uploadedAlready set to 200 KB

Where 200 KB comes from

What actually fits in 200 KB

Worked out from what this tool produces, not from a rule of thumb. Where a row says no, it says what to do instead.

What you haveFits in 200 KB?What it takes
Up to 6 pages of textComfortablyThe lossless pass, with the text left selectable
One scanned page, greyscaleEasilyAround 150 dpi — the usual recommendation, and it looks it
Two scanned pages, greyscaleYesAround 120 dpi
One scanned page in full colourYesColour costs roughly twice what greyscale does at the same clarity
A certificate with a seal or watermarkYesFine detail in a seal is the first thing to soften — check it before sending

200 KB per document is not 200 KB for the application. Portals usually apply the limit per file, so a four-page requirement is four separate 200 KB files, not one.

A greyscale scan at 150 dpi is the sweet spot for this size: small enough to fit with room to spare, sharp enough that a clerk can read a stamped date.

Questions

Should I scan in colour or greyscale?
Greyscale, unless the colour carries information — a coloured seal, a signature in blue ink that has to be distinguishable from a photocopy. Greyscale roughly halves the size at the same readability, which at 200 KB is the difference between one page and two.
Can I merge several certificates and still stay under 200 KB?
Two scanned pages, yes. Beyond that the per-page share gets too small to stay readable. If the portal takes one file per document, keep them separate — it is both smaller and what they asked for.

A different limit?

Every one of these opens the same tool with a different number in the box. If the limit you were given is not here, open Compress PDF and type it in.