/:/toolbook

Text & dev tools

Tidy, count, and convert text, code, and colours. 20 tools · free, no sign-up

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Most popular

JSON FormatterTidy up and check JSON, with the exact spot of any error.Character CounterCheck your post fits on X, Instagram, YouTube, and more.Case ConverterTurn text into camelCase, snake_case, Title Case, and more.

All Text tools20

json→jsonJSON FormatterTidy up and check JSON, with the exact spot of any error.csv→csvCSV FormatterTidy up CSV and spot rows with the wrong number of columns.yaml→yamlYAML FormatterTidy up and check YAML.text→pxMeta Length CheckerCheck your page title and description fit in Google results.text→numCharacter CounterCheck your post fits on X, Instagram, YouTube, and more.img→b64Image to Base64Turn an image into base64 text, or back again.text→caseCase ConverterTurn text into camelCase, snake_case, Title Case, and more.json→tsJSON to TypeScriptTurn a JSON sample into TypeScript interfaces.text×2→diffText Diff CheckerCompare two blocks of text and see exactly what changed.→loremLorem Ipsum GeneratorMake placeholder text by words, sentences, or paragraphs.hex→rgbColor ConverterConvert a colour between HEX, RGB, and HSL.img→paletteColor Palette ExtractorGrab the main colours from any image.hex→wcagContrast CheckerCheck your text colour is readable on its background.svg→svgSVG OptimizerMake SVG files smaller without changing how they look.svg→jsxSVG to ReactTurn an SVG into a React or Vue component.md→htmlMarkdown ConverterTurn Markdown into HTML, PDF, or Word.csv→jsonCSV to JSONTurn CSV rows into JSON.text→regexRegex TesterTest a regex on your text and get it explained in plain English.text→metaMeta Description GeneratorWrite a meta description that fits Google search results.text→dateTimestamp ConverterTurn Unix timestamps into readable dates, and back.

Guides

How long should a meta title and description be?How many characters a meta title and meta description should be, why Google cuts them by width rather than letter count, when Google rewrites them, and how to write ones people click.

About these tools

The small jobs that come up all the time: tidying up a messy JSON file, checking if a caption fits on Instagram, turning a variable name into snake_case, or grabbing the colours from a photo.

Each tool works instantly as you type, with a copy button wherever you need one. No sign-up, no waiting.

Whatever you paste stays on your device — handy when it’s a real API response, a client’s draft, or anything else that shouldn’t be floating around.

Questions people ask

Do the JSON, CSV, and YAML tools convert between formats?

No, each one tidies and checks its own format. To convert between them, use the Data tools, like CSV to JSON.

Can anyone else see what I paste?

No. Everything is worked out on your device and nothing is sent anywhere.