Every tool we make, on one page.
A complete catalog of stoolme utilities, grouped by what you're trying to do. Use the filter to jump straight to a category, or scroll the whole list — it isn't long.
Writing & text
Counters, transformers, and small clean-up tools for prose, copy, and code comments.
Live word, character, sentence and reading-time stats.
→ WritingCharacter counterCount characters with and without spaces, for tweets and SMS limits.
→ WritingCase converterUPPER, lower, Title, Sentence, camelCase, snake_case, kebab-case.
→ WritingLorem ipsum generatorFiller text by words, sentences or paragraphs.
→ WritingText reverserReverse a string by characters, words, or lines.
→ WritingRemove duplicate linesDe-duplicate a list while preserving order. Case-sensitive optional.
→ WritingURL slug generatorConvert any title into a clean, SEO-friendly URL slug.
→Developer
Quick helpers for the work of looking at, transforming, and validating data.
Pretty-print, minify, and validate JSON with line/column errors.
→ DeveloperBase64 encoder / decoderEncode and decode text to Base64 with full UTF-8 support.
→ DeveloperURL encoder / decoderPercent-encode and decode query strings and full URLs.
→ DeveloperHTML entity encoderEscape and unescape HTML characters for safe display.
→ DeveloperBinary ↔ text converterConvert between binary and ASCII / UTF-8 text both ways.
→Design
Small helpers for working with color and CSS.
Convert between HEX, RGB, and HSL with a live preview.
→ DesignCSS gradient generatorBuild linear and radial gradients with copy-ready CSS.
→Math & finance
Everyday calculators with the formulas shown so you can trust them.
Five common percentage problems solved in one place.
→ MathBMI calculatorBody Mass Index with metric and imperial units.
→ MathAge calculatorExact age in years, months, days, hours.
→ MathTip calculatorSplit a bill and calculate tips for any party size.
→ MathLoan calculatorMonthly payment, total interest, and amortization summary.
→Generators
Quickly produce identifiers, secrets, codes, and randomness.
Turn any text or URL into a downloadable QR code.
→ GeneratorPassword generatorStrong, customizable passwords generated in your browser.
→ GeneratorUUID generatorRFC 4122 v4 universally unique identifiers, in bulk.
→ GeneratorRandom number generatorTrue-randomness via crypto.getRandomValues, configurable range.
→Web & SEO
Helpers for publishing pages on the web.