How to keep scanned PDF sizes reasonable

PDF size for scans is almost entirely image size: pixels × complexity. That means the levers live mostly at capture time — and ToPDF's defaults already sit at the sweet spot most portals expect.

What makes a scan heavy

• Visual noise: dim, grainy photos compress badly — noise looks like detail to JPEG. A well-lit page can be smaller and better.
• Busy backgrounds inside the crop: tablecloth texture costs bytes; a tight crop (which auto-crop gives you) removes it.
• Page count: size scales linearly — a 20-page file is ~20 single pages.

ToPDF renders pages up to ~2400 px on the long side at quality-balanced compression: crisp text at typically a few hundred KB per page.

Practical size control

1. Light well and hold steady — clean input compresses beautifully. This alone often halves per-page size versus a dim grainy shot.
2. Split logical parts: for long works, “Part 1/2” files beat one giant attachment; email limits (~20–25 MB) stop being your problem.
3. Need a specific ceiling? If a portal enforces, say, 2 MB, print-to-PDF at reduced quality or use a compressor after checking its privacy model — better, re-check whether the portal accepts the original, since well-lit ToPDF pages usually pass common limits already.

What not to do

Don't screenshot your own PDF pages to shrink them (resolution massacre), and don't run sensitive documents through random online compressors that upload them — size is not worth a server copy. (Why uploads matter.)

Frequently asked questions

How big is a typical ToPDF page?

A clean, well-lit A4 usually lands around 150–500 KB depending on content density; a full 10-page document commonly stays under ~5 MB.

Does removing a page shrink the file proportionally?

Yes — pages are independent, so dropping dead pages (blank backs, duplicates) is the easiest honest compression there is.