Developer Tools calculators & tools
Format data, generate identifiers, inspect tokens, test regular expressions and handle common developer transformations directly in the browser.
JSON Formatter & Validator
Format, validate and inspect JSON with readable indentation and instant syntax errors.
Open tool →Developer ToolsJSON Minifier
Remove insignificant whitespace from valid JSON and verify the input before using the compact result.
Open tool →Developer ToolsJSON ↔ CSV Converter
Convert arrays of JSON objects to CSV or turn a CSV table into JSON records.
Open tool →Developer ToolsYAML ↔ JSON Converter
Convert YAML documents to JSON and JSON objects back to readable YAML.
Open tool →Developer ToolsBase64 Encoder / Decoder
Encode UTF-8 text as Base64 or decode Base64 back into readable text.
Open tool →Developer ToolsURL Encoder / Decoder
Percent-encode URL components or decode percent-encoded text for links, queries and API work.
Open tool →Developer ToolsRegex Tester
Test a JavaScript regular expression against text and inspect matches, indexes and capture groups.
Open tool →Developer ToolsJWT Decoder
Decode JWT header and payload claims, inspect expiration and read the token without verifying its signature.
Open tool →Developer ToolsUUID Generator
Generate one or many cryptographically random UUID version 4 identifiers in the browser.
Open tool →Developer ToolsHash Generator
Calculate SHA-256, SHA-384, SHA-512 or SHA-1 digests from text using the browser crypto API.
Open tool →Developer ToolsPassword Generator
Generate random passwords with configurable length, character sets and optional ambiguous-character removal.
Open tool →Developer ToolsQR Code Generator
Create a downloadable QR code for a URL or text with adjustable size, margin and error correction.
Open tool →Developer ToolsUnix Timestamp Converter
Convert Unix seconds or milliseconds to dates and turn local date/time input into a Unix timestamp.
Open tool →Developer ToolsIP Subnet Calculator
Calculate IPv4 network, subnet mask, broadcast, host range, wildcard mask and address count from CIDR.
Open tool →Developer ToolsColor Converter — HEX, RGB, HSL & CMYK
Convert a HEX color into RGB, HSL and approximate CMYK values with a live color preview.
Open tool →Developer ToolsXML Formatter & Validator
Validate XML syntax and format nested elements with readable indentation.
Open tool →Developer ToolsSQL Formatter
Add readable line breaks and keyword casing to common SQL statements.
Open tool →Developer ToolsHTML Formatter
Indent compact HTML markup for easier reading and debugging.
Open tool →Developer ToolsCSS Minifier
Remove comments and unnecessary whitespace from CSS text.
Open tool →Developer ToolsJavaScript Minifier — Lightweight
Remove basic comments and whitespace from simple JavaScript snippets.
Open tool →Developer ToolsMarkdown Previewer
Preview common Markdown headings, emphasis, code and lists directly in the browser.
Open tool →Developer ToolsText Diff Checker
Compare two blocks of text and highlight added, removed and unchanged lines.
Open tool →Developer ToolsCSV Viewer & Sorter
Parse comma-separated data into a table and sort rows by any detected column.
Open tool →Developer ToolsNumber Base Converter
Convert integers between binary, octal, decimal and hexadecimal notation.
Open tool →Developer ToolsCron Expression Explainer
Break down a standard five-field cron expression into human-readable field meanings.
Open tool →About these developer tools tools
Most developer utilities process data locally in the page. QR generation is also local. The tools are designed for debugging, test data and everyday development workflows rather than replacing security review or production validation.
Every utility includes an interactive result plus an explanation, example, common questions and links to closely related calculators.