Increase PDF File Size

An upload form cannot look at your document; it can only measure it. Byte count is the one property it can check instantly, so forms that receive thousands of scans use a floor to catch the obvious failures: an empty page saved by mistake, a scan with the brightness pushed to pure white, a file that stopped uploading halfway, or a thumbnail sent instead of the full image.

Those failures are real, but so are tiny good files. A one-page PDF exported from a word processor holds only text and a few font subsets, and a phone scanning app that saves black and white pages compresses them hard. Both can be sharp and still land below a floor of 50 or 100 KB. To the form they look identical to a blank page.

Adding a page is the workaround people try first, and it rarely helps. A blank page is almost weightless, and a page with a photo on it changes the document a reviewer reads, which some forms specifically forbid by asking for single-page uploads. If the form does accept extra pages, you can attach one with merge PDF, but padding reaches the same size without altering anything.

Rescanning is the right move when the size is low because the scan is poor. A phone app in black and white mode, or a scanner set to 150 dpi, produces small files that may also be hard to read. Scanning an A4 page at 200 dpi gives 1654 × 2339 pixels, and at 300 dpi 2480 × 3508, which pushes most pages past common minimums naturally. Higher image quality is the in-between option: it re-renders your existing pages at 150 to 600 dpi without a scanner, sharper edges included, but no new detail. For better scans from the start, read how to scan documents to PDF.