How to Reduce PDF Size for Online Portal Uploads

A practical checklist for shrinking scanned PDFs to fit government, bank and court portal upload limits without making them unreadable.

Most online portals cap the size of each upload. Scanned documents are usually the problem: a phone scan or office scanner at high resolution can produce several megabytes per page. Here is a reliable way to bring files under the limit while keeping them readable.

1. Check the limit and the format

Look for the maximum size per file and whether the portal wants PDF, PDF/A or images. Limits change, so check the portal's current instructions rather than relying on old notes.

2. Remove what is not needed

Drop blank pages with Remove blank pages, and delete duplicate or irrelevant pages with Remove pages. Fewer pages is the cleanest saving.

3. Convert colour scans to black & white

Typed letters, notices and forms rarely need colour. Colour to Black & White stores each page with one bit per pixel, which often makes files ten times smaller while the text gets sharper. Keep grayscale for photographs and coloured stamps.

4. Compress to the exact size

Compress to size asks for the limit (for example 1 MB or 2 MB) and picks the best quality that fits. If the limit cannot be reached, split the file into parts with Split PDF.

5. Check before you upload

Open the result and zoom to 100% on the page with the smallest print. If amounts or names are hard to read, go back one step and use a higher resolution.

All of these tools run inside your browser, so confidential documents are never uploaded anywhere except the portal you choose.