PDF guides

Practical, step-by-step help with everyday PDF jobs: getting under upload limits, combining scans on your phone, picking the right format and keeping your documents private.

• How to get a PDF under 100 KB (or 200 KB, or 1 MB) for upload portalsPortal rejected your file? Learn why upload limits exist, what makes scans heavy, and how to shrink a PDF under 100 KB, 200 KB or 1 MB and keep it readable.Read the guide →
• Why is my PDF so big?A PDF can be huge for many reasons: oversized scans, uncompressed images, embedded fonts, old revisions. Learn to spot each cause and what actually fixes it.Read the guide →
• How to combine scanned pages into one PDF on your phoneTurn photos of paper documents into a single PDF on Android or iPhone: shoot clean pages, convert, merge, reorder, rotate, shrink and share, all in the browser.Read the guide →
• PDF or JPG: which format should you use for documents?PDF or JPG for your documents? Compare them for multi-page files, forms, printing and upload portals, and learn how to convert either way at the right dpi.Read the guide →
• Is it safe to use online PDF tools with sensitive documents?What happens to your file when an online PDF tool uploads it, what to check before using one, and how to test for yourself whether a tool works on your device.Read the guide →