Tools
30 articles in this category.
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Unit conversion made simple: metric, imperial, temperature and the Unit Converter
How length, weight, volume and temperature conversions really work, the exact factors behind them, why Celsius to Fahrenheit is not a single multiplier, and the US versus UK gallon trap.
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How to compress images without losing quality: WebP, JPEG and the Image Compressor
How image compression works, when to choose WebP or JPEG, what quality setting to start with, why resizing matters more than quality, and how to shrink photos privately in your browser.
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Lorem ipsum explained: where it comes from and how to use placeholder text well
The real origin of lorem ipsum, why designers use filler text, how much to generate for headings, cards and articles, and the mistakes that leave placeholder copy on live pages.
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Regular expressions for beginners: patterns, flags and the Regex Tester
A practical introduction to regular expressions: the building blocks, capture groups, flags, greedy versus lazy matching, patterns that waste time, and how to test everything live.
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Unix timestamps explained: seconds, milliseconds, time zones and the year 2038
What a Unix timestamp is, how to tell seconds from milliseconds, why 1970 is the starting point, how time zones fit in, and what the 2038 problem means, with examples you can check in the converter.
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How a text diff works: compare two versions and see exactly what changed
How comparison tools find additions and removals, when to compare by line or by word, why invisible whitespace creates false differences, and how to use the Text Diff Checker for drafts, code and configs.
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QR codes explained: error correction, size and the QR Code Generator
How a QR code stores data, what the four error-correction levels mean, how big to print one, and how to make a static code that never expires with no sign-up or tracking.
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URL encoding explained: percent signs, %20 and when to use the URL Encoder
Why spaces become %20, which characters must be encoded, the difference between encoding a component and a whole URL, and how to avoid the classic double-encoding and plus-sign bugs.
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Naming styles explained: camelCase, snake_case, kebab-case and the Case Converter
What camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE are, which language or tool uses which, how title case and sentence case differ, and how to convert text in one click.
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UUIDs explained: what version 4 UUIDs are and how to use them
What a UUID is, how a version 4 UUID is built, how unlikely a collision really is, when to use one as a database key, and how to generate them in bulk with the free UUID Generator.
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Word Counter guide: count words, characters and reading time accurately
How words, characters, sentences and reading time are counted, why different tools give different numbers, and how to use the free Word Counter for essays, posts, meta descriptions and speeches.
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JSON explained: validate, format and fix JSON with the JSON Formatter
What JSON is, the exact rules of valid JSON, the errors that break it most often, and how to validate, pretty-print and minify JSON with the free JSON Formatter.