The Toolerax Blog — Page 9
Practical guides and tips to get the most out of our tools — and the concepts behind them.
Regular Expressions for Beginners
Learn regex from scratch: the core symbols, quantifiers, character classes, capture groups, greedy vs lazy matching, and the mistakes every beginner makes.
Read articleBMR vs TDEE: How Many Calories You Need
Understand BMR, TDEE and activity multipliers, how the Mifflin-St Jeor formula works, and how to set calorie targets to lose, maintain or gain weight.
Read articleHow Text Becomes Binary
How computers turn letters into bits: ASCII, why a byte is 8 bits, how UTF-8 handles every language and emoji, and why you sometimes see garbled characters.
Read articleHow to Convert JSON to CSV
Convert JSON to CSV correctly: how arrays of objects map to rows and columns, how to flatten nested objects, and how CSV escaping works.
Read articleHow to Calculate a Discount
The discount formula, mental shortcuts, working backwards to the original price, why 20% + 10% is not 30% off, and the sale tricks worth seeing through.
Read articleHow Roman Numerals Work
The seven Roman numeral symbols, subtractive notation, how to read and write any year, why IIII appears on clocks, and why the system has no zero.
Read articleMarkdown Syntax Guide
A practical Markdown cheat sheet — headings, emphasis, lists, links, images, code, blockquotes and tables — plus why Markdown became the web's writing format.
Read articleKB, MB, GB & TB Explained
Data storage units explained: bits vs bytes, KB vs KiB, why a 1 TB drive shows as 931 GB, why your internet speed isn't what you think, and a size reference.
Read articleHow Random Number Generators Work
Pseudo-random vs cryptographic randomness, why Math.random is predictable, what modulo bias is, drawing without duplicates, and how RNG bugs cost real money.
Read articleHow to Delete Pages from a PDF
A complete guide to removing pages from a PDF: delete vs split, physical page numbering, why the file may not shrink, redaction warnings, and common mistakes.
Read articleWCAG Color Contrast Explained
What contrast ratio means, the WCAG AA and AAA thresholds for text and UI, how it is calculated, and how to pass without ruining your design.
Read articleHow to Convert JPG Images to a PDF
A complete guide to converting JPG and PNG images into a single PDF: page order, orientation, file size, DPI, scanning documents with a phone, and privacy.
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