Developer
Formatters, encoders, regex, and everyday coding helpers.
Popular JSON Formatter
Beautify, minify, and validate JSON with instant error hints.
Base64 Encode / Decode
Convert text and files to and from Base64 in one click.
New Diff Checker
Compare two texts and highlight every difference, side-by-side or inline.
New URL Encoder / Decoder
Percent-encode or decode text and parse query strings, all in your browser.
New HTML Entity Encoder / Decoder
Escape and unescape HTML entities, with optional numeric encoding.
New Cron Expression Builder
Explain a cron schedule in plain English and preview its next run times.
New HTML Minifier
Compress HTML by removing comments and collapsing whitespace.
New CSS Minifier
Shrink CSS by stripping comments and unnecessary whitespace.
New JSON Escape / Unescape
Escape raw text into a JSON-safe string and unescape it back.
New HTTP Status Codes
Searchable reference of HTTP status codes with plain-English meanings.
New Regex Cheatsheet
Searchable reference of regular expression tokens and flags.
New ASCII Table
Searchable character codes in decimal, hex, octal and binary.
New PX to REM Converter
Convert between px, rem, em and pt against a root font size.
New Spreadsheet Column Converter
Convert a spreadsheet column number to its letter (1 → A) and back.
New Srcset Generator
Build responsive <img> markup with srcset and sizes from your widths.
New Regex Tester
Test regular expressions with live match highlighting, capture groups and replace preview.
New HTML to Markdown
Convert HTML to clean Markdown — pastes, imports files, and handles lists, tables and code.
New JSON Schema Validator
Validate JSON against a JSON Schema (draft-07 / draft-2020-12) with clear error messages.
New YAML Formatter
Validate, beautify, and convert YAML online. Real-time syntax highlighting, error detection with line numbers, and one-click JSON export.