Developer Tools
Format, decode, encode, and test data purely in your browser. Fast and private.
JSON Formatter
Format, beautify, and validate JSON data directly in your browser.
Base64 Encoder
Encode text to Base64 or decode Base64 back to text instantly.
URL Encoder
Encode special characters in URLs or decode them back to readable text.
JWT Decoder
Decode JSON Web Tokens (JWT) safely in your browser (no server parsing).
UUID Generator
Generate random version 4 UUIDs (Universally Unique Identifiers) instantly.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes instantly.
Unix Timestamp
Convert Unix timestamps to readable dates and vice versa.
CSV to JSON
Convert CSV spreadsheets into clean JSON arrays.
JSON to CSV
Convert JSON arrays into downloadable CSV files.
HTML Beautifier
Format and indent messy HTML code.
CSS Beautifier
Format and indent CSS stylesheets.
JS Beautifier
Format and beautify messy JavaScript code.
SQL Formatter
Format and beautify SQL queries.
XML Formatter
Format and beautify XML documents.
YAML Formatter
Format and validate YAML files.
Regex Tester
Test regular expressions directly in your browser with real-time highlighting.
CSV to SQL
Convert CSV spreadsheets directly into SQL INSERT statements.
Dummy Data Generator
Generate massive amounts of fake JSON data for testing your apps.
HTML Entities Encoder
Encode and decode HTML entities safely directly in your browser.
Pomodoro Timer
A brutalist productivity timer to keep you focused.
Password Generator
Generate highly secure, random passwords instantly in your browser.
Base64 String Encoder
Encode and decode text to and from Base64 instantly.
CSS Minifier
Minify your CSS code by removing comments and whitespace.
Box Shadow Generator
Design perfect CSS box shadows visually and copy the code instantly.
CSS Gradient Generator
Create stunning CSS gradients and generate the code automatically.
Aspect Ratio Calculator
Calculate dimensions perfectly using any aspect ratio.
CSS Formatter
Instantly format and beautify ugly CSS code into readable format.
URL Parser
Break down any URL into its exact components and query parameters.
Hash Generator
Generate highly secure SHA-1, SHA-256, and SHA-512 hashes instantly.
Color Converter
Quickly convert colors between HEX, RGB, HSL, and CMYK formats.
Base Converter
Free online Base Converter tool. Private, secure, and client-side.
Base32
Free online Base32 tool. Private, secure, and client-side.
Base58
Free online Base58 tool. Private, secure, and client-side.
Base62
Free online Base62 tool. Private, secure, and client-side.
Base64url
Free online Base64url tool. Private, secure, and client-side.
Bash Script Generator
Free online Bash Script Generator tool. Private, secure, and client-side.
Binary to Decimal
Free online Binary to Decimal tool. Private, secure, and client-side.
Code to Image
Free online Code to Image tool. Private, secure, and client-side.
Color Blindness Simulator
Free online Color Blindness Simulator tool. Private, secure, and client-side.
Color Contrast Checker
Free online Color Contrast Checker tool. Private, secure, and client-side.
Color Mixer
Free online Color Mixer tool. Private, secure, and client-side.
Color Name Lookup
Free online Color Name Lookup tool. Private, secure, and client-side.
Color Palette Generator
Free online Color Palette Generator tool. Private, secure, and client-side.
Color Picker
Free online Color Picker tool. Private, secure, and client-side.
Color Shade Generator
Free online Color Shade Generator tool. Private, secure, and client-side.
Color to Tailwind
Free online Color to Tailwind tool. Private, secure, and client-side.
Connection String Parser
Free online Connection String Parser tool. Private, secure, and client-side.
Conventional Commits
Free online Conventional Commits tool. Private, secure, and client-side.
Cors Header Generator
Free online Cors Header Generator tool. Private, secure, and client-side.
Cron Expression Generator
Free online Cron Expression Generator tool. Private, secure, and client-side.
Cron Expression Parser
Free online Cron Expression Parser tool. Private, secure, and client-side.
Csp Generator
Free online Csp Generator tool. Private, secure, and client-side.
CSS Border Radius Generator
Free online CSS Border Radius Generator tool. Private, secure, and client-side.
CSS Clamp Calculator
Free online CSS Clamp Calculator tool. Private, secure, and client-side.
CSS Clip Path Generator
Free online CSS Clip Path Generator tool. Private, secure, and client-side.
CSS Cubic Bezier Generator
Free online CSS Cubic Bezier Generator tool. Private, secure, and client-side.
CSS Filter Generator
Free online CSS Filter Generator tool. Private, secure, and client-side.
CSS Flexbox Playground
Free online CSS Flexbox Playground tool. Private, secure, and client-side.
CSS Glassmorphism Generator
Free online CSS Glassmorphism Generator tool. Private, secure, and client-side.
CSS Gradient Generator
Free online CSS Gradient Generator tool. Private, secure, and client-side.
CSS Gradient Text Generator
Free online CSS Gradient Text Generator tool. Private, secure, and client-side.
CSS Grid Generator
Free online CSS Grid Generator tool. Private, secure, and client-side.
CSS Keyframe Animation Generator
Free online CSS Keyframe Animation Generator tool. Private, secure, and client-side.
CSS Loader Generator
Free online CSS Loader Generator tool. Private, secure, and client-side.
CSS Neumorphism Generator
Free online CSS Neumorphism Generator tool. Private, secure, and client-side.
CSS Specificity Calculator
Free online CSS Specificity Calculator tool. Private, secure, and client-side.
CSS Text Shadow Generator
Free online CSS Text Shadow Generator tool. Private, secure, and client-side.
CSS to React Native
Free online CSS to React Native tool. Private, secure, and client-side.
CSS to Scss
Free online CSS to Scss tool. Private, secure, and client-side.
CSS to Tailwind
Free online CSS to Tailwind tool. Private, secure, and client-side.
CSS Transition Generator
Free online CSS Transition Generator tool. Private, secure, and client-side.
CSS Triangle Generator
Free online CSS Triangle Generator tool. Private, secure, and client-side.
CSS Unit Converter
Free online CSS Unit Converter tool. Private, secure, and client-side.
CSV Column Extractor
Free online CSV Column Extractor tool. Private, secure, and client-side.
CSV Merger
Free online CSV Merger tool. Private, secure, and client-side.
CSV Splitter
Free online CSV Splitter tool. Private, secure, and client-side.
CSV to HTML
Free online CSV to HTML tool. Private, secure, and client-side.
CSV to Markdown
Free online CSV to Markdown tool. Private, secure, and client-side.
CSV to TSV
Free online CSV to TSV tool. Private, secure, and client-side.
CSV to XML
Free online CSV to XML tool. Private, secure, and client-side.
CSV Viewer
Free online CSV Viewer tool. Private, secure, and client-side.
Data Storage Converter
Free online Data Storage Converter tool. Private, secure, and client-side.
Decimal to Binary
Free online Decimal to Binary tool. Private, secure, and client-side.
Dotenv Linter
Free online Dotenv Linter tool. Private, secure, and client-side.
Editorconfig Generator
Free online Editorconfig Generator tool. Private, secure, and client-side.
Eslint Config Generator
Free online Eslint Config Generator tool. Private, secure, and client-side.
File Size Converter
Free online File Size Converter tool. Private, secure, and client-side.
Graphql Formatter
Free online Graphql Formatter tool. Private, secure, and client-side.
Hex to Binary
Free online Hex to Binary tool. Private, secure, and client-side.
Hex to Decimal
Free online Hex to Decimal tool. Private, secure, and client-side.
Hmac Generator
Free online Hmac Generator tool. Private, secure, and client-side.
HTML Encoder Decoder
Free online HTML Encoder Decoder tool. Private, secure, and client-side.
HTML Entity Encoder
Free online HTML Entity Encoder tool. Private, secure, and client-side.
HTML Formatter
Free online HTML Formatter tool. Private, secure, and client-side.
HTML Live Editor
Free online HTML Live Editor tool. Private, secure, and client-side.
HTML Minifier
Free online HTML Minifier tool. Private, secure, and client-side.
HTML Special Characters
Free online HTML Special Characters tool. Private, secure, and client-side.
HTML Table Generator
Free online HTML Table Generator tool. Private, secure, and client-side.
HTML to Jsx
Free online HTML to Jsx tool. Private, secure, and client-side.
Htpasswd Generator
Free online Htpasswd Generator tool. Private, secure, and client-side.
Http Cache Control
Free online Http Cache Control tool. Private, secure, and client-side.
Http Cookie Builder
Free online Http Cookie Builder tool. Private, secure, and client-side.
Http Header Parser
Free online Http Header Parser tool. Private, secure, and client-side.
Ieee 754 Converter
Free online Ieee 754 Converter tool. Private, secure, and client-side.
Ini to JSON
Free online Ini to JSON tool. Private, secure, and client-side.
Javascript Beautifier
Free online Javascript Beautifier tool. Private, secure, and client-side.
Javascript Minifier
Free online Javascript Minifier tool. Private, secure, and client-side.
Javascript Obfuscator
Free online Javascript Obfuscator tool. Private, secure, and client-side.
JS Object to JSON
Free online JS Object to JSON tool. Private, secure, and client-side.
JSON Beautifier
Free online JSON Beautifier tool. Private, secure, and client-side.
JSON Diff
Free online JSON Diff tool. Private, secure, and client-side.
JSON Editor
Free online JSON Editor tool. Private, secure, and client-side.
JSON Escape
Free online JSON Escape tool. Private, secure, and client-side.
JSON Flattener
Free online JSON Flattener tool. Private, secure, and client-side.
JSON Minifier
Free online JSON Minifier tool. Private, secure, and client-side.
JSON Parser
Free online JSON Parser tool. Private, secure, and client-side.
JSON Path Finder
Free online JSON Path Finder tool. Private, secure, and client-side.
JSON Repair
Free online JSON Repair tool. Private, secure, and client-side.
JSON Schema Generator
Free online JSON Schema Generator tool. Private, secure, and client-side.
JSON Schema Validator
Free online JSON Schema Validator tool. Private, secure, and client-side.
JSON Sort Keys
Free online JSON Sort Keys tool. Private, secure, and client-side.
JSON Stringify
Free online JSON Stringify tool. Private, secure, and client-side.
JSON to Csharp
Free online JSON to Csharp tool. Private, secure, and client-side.
JSON to Dart
Free online JSON to Dart tool. Private, secure, and client-side.
JSON to Env
Free online JSON to Env tool. Private, secure, and client-side.
JSON to Go
Free online JSON to Go tool. Private, secure, and client-side.
JSON to HTML Table
Free online JSON to HTML Table tool. Private, secure, and client-side.
JSON to Java
Free online JSON to Java tool. Private, secure, and client-side.
JSON to Jsonl
Free online JSON to Jsonl tool. Private, secure, and client-side.
JSON to Kotlin
Free online JSON to Kotlin tool. Private, secure, and client-side.
JSON to Markdown Table
Free online JSON to Markdown Table tool. Private, secure, and client-side.
JSON to Mongoose
Free online JSON to Mongoose tool. Private, secure, and client-side.
JSON to Php
Free online JSON to Php tool. Private, secure, and client-side.
JSON to Python
Free online JSON to Python tool. Private, secure, and client-side.
JSON to Rust
Free online JSON to Rust tool. Private, secure, and client-side.
JSON to SQL
Free online JSON to SQL tool. Private, secure, and client-side.
JSON to Swift
Free online JSON to Swift tool. Private, secure, and client-side.
JSON to TOML
Free online JSON to TOML tool. Private, secure, and client-side.
JSON to Typescript
Free online JSON to Typescript tool. Private, secure, and client-side.
JSON to XML
Free online JSON to XML tool. Private, secure, and client-side.
JSON to YAML
Free online JSON to YAML tool. Private, secure, and client-side.
JSON to Zod
Free online JSON to Zod tool. Private, secure, and client-side.
JSON Unflattener
Free online JSON Unflattener tool. Private, secure, and client-side.
JSON Validator
Free online JSON Validator tool. Private, secure, and client-side.
JSON Viewer
Free online JSON Viewer tool. Private, secure, and client-side.
JWK to PEM
Free online JWK to PEM tool. Private, secure, and client-side.
JWT Generator
Free online JWT Generator tool. Private, secure, and client-side.
JWT Signing Key Generator
Free online JWT Signing Key Generator tool. Private, secure, and client-side.
Markdown Table Generator
Free online Markdown Table Generator tool. Private, secure, and client-side.
Ndjson to JSON
Free online Ndjson to JSON tool. Private, secure, and client-side.
Number Base Converter
Free online Number Base Converter tool. Private, secure, and client-side.
Number Formatter
Free online Number Formatter tool. Private, secure, and client-side.
Number to Words
Free online Number to Words tool. Private, secure, and client-side.
Package JSON Generator
Free online Package JSON Generator tool. Private, secure, and client-side.
Prettier Config Generator
Free online Prettier Config Generator tool. Private, secure, and client-side.
Px to Rem
Free online Px to Rem tool. Private, secure, and client-side.
Random Color Generator
Free online Random Color Generator tool. Private, secure, and client-side.
Roman Numeral Converter
Free online Roman Numeral Converter tool. Private, secure, and client-side.
Screen Color Picker
Free online Screen Color Picker tool. Private, secure, and client-side.
Scss to CSS
Free online Scss to CSS tool. Private, secure, and client-side.
Semver Calculator
Free online Semver Calculator tool. Private, secure, and client-side.
Snowflake Decoder
Free online Snowflake Decoder tool. Private, secure, and client-side.
SQL Create Table Generator
Free online SQL Create Table Generator tool. Private, secure, and client-side.
SQL to CSV
Free online SQL to CSV tool. Private, secure, and client-side.
SQL to JSON
Free online SQL to JSON tool. Private, secure, and client-side.
Svg Optimizer
Free online Svg Optimizer tool. Private, secure, and client-side.
Svg Wave Generator
Free online Svg Wave Generator tool. Private, secure, and client-side.
Tabs to Spaces
Free online Tabs to Spaces tool. Private, secure, and client-side.
Tailwind Config Generator
Free online Tailwind Config Generator tool. Private, secure, and client-side.
Text to CSV
Free online Text to CSV tool. Private, secure, and client-side.
Text to JSON
Free online Text to JSON tool. Private, secure, and client-side.
TOML to JSON
Free online TOML to JSON tool. Private, secure, and client-side.
TOML to YAML
Free online TOML to YAML tool. Private, secure, and client-side.
TOTP Generator
Free online TOTP Generator tool. Private, secure, and client-side.
Typescript Config Generator
Free online Typescript Config Generator tool. Private, secure, and client-side.
Typescript to Javascript
Free online Typescript to Javascript tool. Private, secure, and client-side.
Typescript to Zod
Free online Typescript to Zod tool. Private, secure, and client-side.
ULID Generator
Free online ULID Generator tool. Private, secure, and client-side.
Unicode Inspector
Free online Unicode Inspector tool. Private, secure, and client-side.
UUID V7 Generator
Free online UUID V7 Generator tool. Private, secure, and client-side.
Vite Config Generator
Free online Vite Config Generator tool. Private, secure, and client-side.
Webpack Config Generator
Free online Webpack Config Generator tool. Private, secure, and client-side.
XML to CSV
Free online XML to CSV tool. Private, secure, and client-side.
XML to JSON
Free online XML to JSON tool. Private, secure, and client-side.
XML to YAML
Free online XML to YAML tool. Private, secure, and client-side.
XML Validator
Free online XML Validator tool. Private, secure, and client-side.
Xpath Tester
Free online Xpath Tester tool. Private, secure, and client-side.
YAML to JSON
Free online YAML to JSON tool. Private, secure, and client-side.
Essential Developer Utilities
A curated collection of tools designed specifically for software engineers. Format JSON, generate hashes, decode JWTs, and minify CSS—all executing securely on the client-side.
Frequently Asked Questions
Is it safe to decode JWTs or hash passwords here?
Absolutely. We designed these tools specifically because pasting sensitive data into server-backed tools is a security risk. billu.fun runs entirely locally.
Do you store history?
No, we do not utilize localStorage or cookies to save your tool history for maximum security.