Guides

Short, practical explanations of the things that come up when you work with photos, PDFs and GIFs: which image format to pick, what DPI really means for printing, how OCR reads a scan, why a PDF is large and how to make it smaller.

Each guide links to the tool that does the job, so you can read the reasoning and try it on your own file straight away.

• WhatsApp Sticker GuideStickers from photos and videos, 3-sticker packs, adding to WhatsApp — illustrated
• Image Formats GuideJPG, PNG, WebP, AVIF — which one, and when?
• Paper Sizes GuideA series, US sizes, and mm/pixel equivalents for print
• DPI & PPI GuideDPI vs PPI, and how many pixels you need to print
• Password Security GuideNIST rules, entropy, passphrases, WiFi and PIN safety
• Geometric Shapes GuideSides, vertices, faces and edges of every 2D and 3D shape
• OCR GuideTurn scanned PDFs and photos into text
• PDF Compression GuideShrink PDFs and fit upload limits
• GIF Optimization GuideMethods to reduce GIF file size
• Digital SafetyWhat your files leave behind on the internet