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Regex testers, CSS generators, JSON formatters, encoders, converters — all free, all instant, no signup required.
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Popular Tools
Regex⭐
Regex Tester
test and debug regular expressions with real-time matching
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CSS⭐
CSS Gradient Generator
generate CSS linear, radial, and conic gradients visually
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JSON⭐
JSON Formatter
format and prettify JSON with syntax highlighting
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JSON⭐
JSON Validator
validate JSON and show specific error locations
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JSON⭐
JSON to TypeScript
convert JSON objects to TypeScript interfaces automatically
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JSON⭐
JSON to Excel / CSV
convert JSON arrays and objects to .xlsx or .csv instantly
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JSON⭐
OpenAPI Diff Checker
compare two OpenAPI specs and detect breaking changes
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Colors⭐
Color Converter
convert between HEX, RGB, HSL, HSB, and CMYK color formats
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All 56 Tools
Every tool grouped by what it does. Click any name to open it.
Regex Tester
test and debug regular expressions with real-time matching
Regex CheatsheetSoon
browse a complete regex syntax reference with live examples
Regex to String GeneratorSoon
generate matching strings from a regex pattern
Common Regex PatternsSoon
browse and copy 100+ common regex patterns for email, URL, phone, and more
Regex ExplainerSoon
break down a regex pattern into plain English with visual diagrams
Regex Flags ExplainedSoon
understand what regex flags g, i, m, s, u, y do with live examples
Lookahead & Lookbehind GuideSoon
learn lookahead and lookbehind assertions with interactive examples
Named Capture GroupsSoon
learn and test named capture groups in regex
CSS Gradient Generator
generate CSS linear, radial, and conic gradients visually
CSS Box Shadow GeneratorSoon
build CSS box-shadow with live preview and copy-ready code
CSS Border Radius GeneratorSoon
create complex CSS border-radius shapes with per-corner controls
CSS Flexbox GeneratorSoon
generate CSS flexbox layouts with a visual editor
CSS Grid GeneratorSoon
generate CSS grid templates visually with live preview
CSS Animation GeneratorSoon
build CSS keyframe animations with timeline editor and preview
CSS Filter GeneratorSoon
combine CSS filter functions (blur, brightness, etc.) with live preview
CSS Clip Path GeneratorSoon
draw CSS clip-path shapes and copy the generated code
CSS Variables CheatsheetSoon
complete CSS custom properties reference with examples
CSS Specificity CalculatorSoon
calculate and compare CSS selector specificity scores
JSON Formatter
format and prettify JSON with syntax highlighting
JSON Validator
validate JSON and show specific error locations
JSON Minifier
minify JSON by removing whitespace to reduce size
JSON to TypeScript
convert JSON objects to TypeScript interfaces automatically
JSONPath Tester
test JSONPath expressions against JSON data in real time
JSON to Excel / CSV
convert JSON arrays and objects to .xlsx or .csv instantly
OpenAPI Diff Checker
compare two OpenAPI specs and detect breaking changes
DB Schema Diff
compare two database schemas and spot column-level changes
CSV to JSON Converter
convert CSV to JSON (and back) with support for quoted fields
SQL Formatter
format and beautify SQL queries with keyword uppercasing and indentation
Color Converter
convert between HEX, RGB, HSL, HSB, and CMYK color formats
Color Contrast CheckerSoon
check WCAG color contrast ratio for accessibility compliance
Color Palette GeneratorSoon
generate harmonious color palettes from a base color
Color Shades GeneratorSoon
generate tints and shades of any color for design systems
Gradient Color PickerSoon
extract the color at any point of a CSS gradient
Word Counter
count words, characters, sentences, and reading time in real time
Case Converter
convert text between camelCase, snake_case, kebab-case, and more
Lorem Ipsum GeneratorSoon
generate Lorem Ipsum placeholder text in multiple formats
Text Diff Checker
find differences between two text blocks with color-coded highlighting
Markdown Previewer
preview Markdown with live side-by-side rendering
Slug GeneratorSoon
convert any text to a URL-friendly slug
Base64 Encoder / Decoder
encode and decode Base64 strings and files in your browser
URL Encoder / Decoder
encode and decode URL percent-encoding for query strings and paths
HTML Entity EncoderSoon
encode and decode HTML entities for safe HTML embedding
JWT Decoder
decode JWT tokens and inspect header, payload, and claims
Hash Generator
generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text
UUID Generator
generate UUID v4 identifiers in bulk, all client-side
Unix Timestamp Converter
convert between Unix timestamps and human-readable dates
Timezone ConverterSoon
convert times between any two time zones instantly
Date Duration CalculatorSoon
calculate the duration between two dates or add/subtract time
Cron Expression Generator
build and explain cron schedule expressions with a visual builder
Number Base Converter
convert numbers between binary, octal, decimal, and hex
Bit & Byte CalculatorSoon
convert between bits, bytes, KB, MB, GB, TB instantly
Percentage CalculatorSoon
calculate percentages, percentage changes, and ratios
Roman Numeral ConverterSoon
convert between Arabic numbers and Roman numerals
56 tools and counting
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