Tool category
Developer Tools
Format, inspect, encode, and validate common developer data.
Available tools
JSON Formatter
Parse, validate, pretty-print, minify, copy, and download JSON locally.
JSON Validator
Validate JSON and show useful parsing errors without sending data anywhere.
JSON Minifier
Parse and minify valid JSON locally.
JSON Formatter
Parse, validate, pretty-print, minify, copy, and download JSON locally.
JSON Validator
Validate JSON and show useful parsing errors without sending data anywhere.
JSON Minifier
Parse and minify valid JSON locally.
XML Formatter
Format XML locally with indentation, well-formedness checks, mixed-content preservation, and a downloadable UTF-8 result.
XML Validator
Check XML well-formedness in your browser, read parser errors, and copy or download a syntax-check report.
HTML Formatter
Format pasted HTML into readable source locally. View safe text output, choose indentation, and copy or download HTML.
HTML Minifier
Minify HTML locally with optional whitespace collapsing and comment removal. Preserve embedded scripts, styles, and preformatted text.
CSS Formatter
Format CSS rules, declarations, and media queries in your browser with readable indentation and local copy or download.
CSS Minifier
Remove CSS formatting and ordinary comments locally while preserving rule order, selectors, custom properties, and license comments.
JavaScript Formatter
Format JavaScript and JSX locally without executing source. Choose indentation, see parser errors, and copy or download readable code.
JavaScript Minifier
Minify JavaScript source locally with Terser, without execution, variable renaming, or code compression. Copy or download compact JavaScript.
SQL Formatter
Format SQL in your browser with SQL, PostgreSQL, MySQL, SQLite, T-SQL and BigQuery dialects.
Markdown Previewer
Preview Markdown locally with sanitized headings, lists, links, code blocks and tables. Copy or download the safe HTML.
Markdown to HTML
Convert Markdown into sanitized HTML in your browser, then copy the markup or download an HTML file.
HTML to Markdown
Convert pasted HTML into Markdown locally without executing scripts or loading embedded resources.
URL Encoder
Percent-encode UTF-8 text as a URL component, whole URL or form value with explicit encoding modes.
URL Decoder
Decode percent-encoded UTF-8 URL text, preserve whole-URL delimiters or interpret form plus signs, with clear errors.
Base64 Encoder
Encode Unicode text as UTF-8 Base64 or unpadded Base64url, entirely in your browser.
Base64 Decoder
Decode Base64 or Base64url into UTF-8 text with validation of alphabet, padding and decoded bytes.
UUID Generator
Generate random version 4 UUIDs using browser cryptography, individually or in batches of up to 1,000.
Unix Timestamp Converter
Convert Unix seconds or milliseconds to UTC dates, or ISO dates with explicit timezone offsets back to timestamps.
Regex Tester
Test JavaScript regular expressions locally with flags, match positions, capture groups and a protected background worker.
JWT Decoder
Decode JWT header and payload JSON locally. Signatures and claims are not verified or trusted.
HTML Entity Encoder
Encode HTML-sensitive characters or every Unicode character as HTML entities without uploading your text.
HTML Entity Decoder
Decode named and numeric HTML character references safely into plain text, without rendering supplied markup.
Hash Generator
Generate SHA-256, SHA-384, SHA-512 or legacy SHA-1 hashes of UTF-8 text with the browser Web Crypto API.
Cron Expression Helper
Build and explain common five-field Unix cron expressions locally, with numeric lists, ranges, steps and explicit day rules.