📚 The Blog
Guides, tips and how-tos for getting the most out of free online tools.
Convert CSV to a real Excel .xlsx workbook for free — columns split correctly, no software, nothing uploaded. Quick browser-based guide.
Learn how to calculate a weighted grade from your scores and their weights — the formula, worked examples, and a free grade calculator.
Convert Excel or CSV to a clean JSON array of objects for free — perfect for APIs, seeding databases and JavaScript. Runs in your browser.
Find out the exact score you need on your final exam to hit your target grade — the formula, examples, and a free final grade calculator.
Convert CSV to JSON and JSON to CSV free in your browser — with correct quoting and nested handling. Simple guide for developers and analysts.
Format and beautify minified CSS, HTML and XML into clean, readable code — free online, in your browser. When to minify vs beautify.
Convert JSON to YAML free online for Docker, Kubernetes, GitHub Actions and config files — what changes, when to use YAML, and a quick converter.
The "multiply by 7" rule is a myth. Here's how to really calculate your dog's age in human years, with a free dog age calculator.
Learn how to calculate sales tax on any purchase — the formula, examples, and a free sales tax calculator for the total, tax and subtotal.
Generate TypeScript interfaces from a JSON sample for free — nested types included. Stop hand-typing API response types.
See how inflation erodes the value of money over time and how much you'll need to keep the same buying power — with a free inflation calculator.
Turn a CSV file into SQL INSERT statements free online — name your table and get ready-to-run queries. Great for seeding databases.