Browser Info Checker
Your browser, engine, platform, languages and what it supports.
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Every one of our 1329 tools in one place — free, no sign-up, and all of them run inside your own browser.
1329 free tools
11 categories
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HTML to JSX
Convert HTML into valid JSX, with every attribute renamed correctly.
CSS Specificity Calculator
Score a selector and find out which of two rules actually wins.
Media Query Generator
Build media queries with framework breakpoints and modern features.
Flexbox Generator
Learn and generate flexbox layouts with a live, interactive preview.
UUID v7 Generator
Generate time-ordered UUID v7 identifiers that index cleanly.
RSA Key Generator
Generate an RSA key pair in PEM form, in your browser.
HMAC Generator
Generate HMAC signatures with SHA-1, SHA-256, SHA-384 or SHA-512.
CSV to Markdown Table
Convert CSV or a spreadsheet paste into a padded Markdown table.
JSON to YAML
Convert JSON to clean, correctly quoted YAML in one step.
JSON to Rust Struct
Generate serde-ready Rust structs from a sample JSON document.
JSON to Dart Class
Generate Dart model classes with fromJson and toJson from a sample payload.
JSON to Java Class
Generate Java POJOs or records with Jackson annotations from JSON.
JSON to TypeScript
Generate TypeScript interfaces from a sample JSON payload.
Query String to JSON
Turn a URL query string into structured JSON, including nested and repeated keys.
JSON Diff
Compare two JSON documents structurally and see exactly which paths changed.
Estate Tax Calculator
Taxable estate after the exemption, and the tax due.
Running Pace Calculator
Race finish times, split tables and a predictor for other distances.
Healthy Weight Calculator
Your healthy weight range from BMI, height and frame.
Pregnancy Calculator
Estimate a due date and see the week-by-week pregnancy timeline.
Calorie Calculator
Daily calories to maintain, lose or gain weight at your own pace.
Profit Margin Calculator
Gross margin, profit and the selling price a target margin needs.
Long Division Calculator
Long division worked out step by step, as you would write it.
Prime Factorization Calculator
Prime factors, exponent form and a factor tree.
Slope Calculator
Slope, line equation, angle and distance from two points.
Percent Error Calculator
Percent error, absolute error and relative error together.
Sample Size Calculator
How many people you need to survey, and the margin of error.
Stair Calculator
Rise, run and stringer length that meet code.
BTU Calculator
Heating and cooling BTU needed for a room.
Molecular Weight Calculator
Molar mass from a chemical formula, element by element.
Tire Size Calculator
Compare two tire sizes and see the speedometer error.
SVG Viewer
Preview SVG markup live and inspect what is inside it.
Lazy Load Code Generator
Generate image markup that loads late and never shifts layout.
Remove HTML Tags
Strip HTML markup and get clean, readable plain text.
NATO Alphabet to Text
Turn Alfa Bravo Charlie back into the letters they stand for.
Dummy Text Generator
Filler copy in several styles, not just Latin.
Gunning Fog Index
Measure how much fog long words and sentences add to your writing.
Flesch-Kincaid Calculator
Get the US school grade level your text requires.
Google Ads Preview
Write responsive search ad copy against the real character limits.
Long-Tail Keyword Generator
Expand a seed keyword into hundreds of long-tail variations.
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