Scanning tips
Short, practical guides to getting clean scans from a phone camera — and to the small decisions around them: formats, lighting, privacy, multi-page workflows.
How to scan documents with your phone (no app needed)Turn your phone camera into a document scanner: how to shoot, straighten and save paperwork as PDF using only your browser.How to convert photos to PDF for freeMerge one or many document photos into a clean, straightened PDF in your browser — no app, no watermark, no upload.How to scan receipts before they fadeThermal receipts fade in months. How to digitize receipts quickly for expenses, taxes and warranties — and actually find them later.How to scan a book or many pages quicklyA practical workflow for digitizing textbooks, notes and manuals page by page — and merging everything into one PDF.How to photograph documents without shadowsWhy your document photos have a dark stripe across them, and five ways to shoot shadow-free — plus what enhancement can and cannot fix.JPG, PNG or PDF: which format for scanned documents?A practical guide to choosing the right file format for scans — size, quality, multi-page support and where each one belongs.Are online document scanners safe? What to checkUploading a contract to a random website is a real risk. How browser-side processing differs, and the questions to ask before you scan.What is perspective correction? (And why scans look flat)The geometry behind turning a tilted photo of a page into a flat scan: homography, corner detection and where it breaks down.