Guides
Step-by-step guides with real examples for the tools on this site and the basics behind them.
- Encoding & securityBase64 is not encryption: encoding, encryption and hashing explainedWhat Base64 actually does, why it does not protect secrets, how it differs from encryption and hashing, and how to encode and decode text and files.Updated:
- Business documentsHow to create an invoice and save it as a PDFStep-by-step: fill in your details, line items, discount and tax, choose the document language and currency, check the preview and download a PDF.Updated:
- Data & developmentHow to find and fix JSON errors, then format JSONThe JSON mistakes that break parsers most often — quotes, commas, comments, True/False — how to locate them, and how to format, minify and inspect JSON.Updated:
- ImagesHow to reduce an image to under 200 KBMake a photo fit an upload limit such as 200 KB: compress to a target size, resize when needed, check the result and fix files that stay too large.Updated:
- SEO & web publishingHow to write meta tags and check the search and social previewWrite a title, description, canonical URL and Open Graph tags for a page, read the length guidance and previews, and avoid common mistakes with robots and images.Updated:
- ImagesJPG vs PNG vs WebP: which image format to useHow JPG, PNG and WebP differ in compression, transparency and compatibility, which one to pick for photos, screenshots and logos, and how to convert.Updated:
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