Guides
Practical guides on working with PDFs and images, and on keeping your files private while you do it.
Pixels, KB, DPI and mm: What Photo Size Requirements Really Mean
Forms ask for photo size in pixels, KB, mm or DPI. Learn what each one means and how to prepare an image that the form accepts.
November 8, 20265 min readRead
WebP vs JPG: What Is the Difference and Which Should You Use?
WebP or JPG? See how they differ in file size, quality, transparency and support, and which one to pick for photos, websites and forms.
November 7, 20266 min readRead
How to Reduce Image Size Without Losing Quality
Make photos smaller without visible loss: resize, crop, pick the right format and quality, and check the result before you share or upload.
November 7, 20265 min readRead
Is It Safe to Use Online PDF Tools? How to Check Before You Upload
Many online PDF tools upload your file to a server. Learn what that means and how to check any tool yourself in two minutes.
November 6, 20267 min readRead