Developer Tools
Utilities for everyday development work: format and validate JSON, decode JWTs, generate UUIDs, encode and decode Base64 and URLs, convert timestamps, and more. Everything runs locally in your browser.
31 tools in this category.
Tools in Developer Tools
JSON Formatter
Format, beautify, and validate JSON with adjustable indentation — instantly in your browser.
Developer Tools
JSON Validator
Check whether your JSON is valid and find the exact line and column of any syntax error.
Developer Tools
UUID Generator
Generate cryptographically random UUID v4 identifiers, one or a thousand at a time.
Developer Tools
Base64 Encoder
Encode any text — including emoji and non-Latin scripts — into standard Base64.
Developer Tools
Base64 Decoder
Decode Base64 back into readable text, with clear errors for malformed input.
Developer Tools
URL Encoder
Percent-encode text for safe use in URLs — as a query value or a full URL.
Developer Tools
URL Decoder
Decode percent-encoded URLs and query strings back into readable text.
Developer Tools
JWT Decoder
Decode a JWT’s header and payload and check its expiration — without sending it anywhere.
Developer Tools
Unix Timestamp Converter
Convert Unix timestamps to readable dates and back, with a live current-time readout.
Developer Tools
Regex Tester
Test and debug regular expressions with live matches, capture groups, and highlighted results.
Developer Tools
SQL Formatter
Format and beautify SQL queries for MySQL, PostgreSQL, SQLite, and more — with optional keyword uppercase and tab indentation.
Developer Tools
HTTP Status Code Lookup
Look up any HTTP status code from 100 to 511 with plain-language explanations, searchable and filterable by category.
Developer Tools
CSV to JSON Converter
Convert CSV to JSON and JSON to CSV instantly, right in your browser.
Data Tools
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes of any text instantly.
Developer Tools
UTM Builder
Add UTM campaign parameters to any URL so you can track traffic sources accurately in Google Analytics.
SEO Tools
Meta Tag Generator
Generate title, meta description, canonical, Open Graph, and Twitter card tags as ready-to-paste HTML.
SEO Tools
Sitemap Generator
Generate a clean XML sitemap for your website in seconds.
SEO Tools
robots.txt Generator
Generate a valid robots.txt with allow and disallow rules, sitemaps, and AI crawler directives.
SEO Tools
HTML Entity Encoder/Decoder
Encode special characters to HTML entities (& < > " ’) and decode named, decimal, or hex entities back to text.
Encoding Tools
Morse Code Translator
Translate text to Morse code and decode Morse back to text. Letter-perfect ITU/ANSI standard.
Encoding Tools
Base32 Encoder/Decoder
Encode text to Base32 and decode Base32 strings back. RFC 4648 alphabet, UTF-8 safe.
Encoding Tools
Cron Expression Parser
Parse a 5-field cron expression and see when it will next fire, with a plain-English explanation.
Developer Tools
JSON to YAML Converter
Convert JSON to clean YAML and decode YAML back to JSON. Round-trips common JSON shapes.
Data Tools
HTML Minifier
Shrink HTML by stripping comments and collapsing whitespace. See byte savings in real time.
Developer Tools
CSS Minifier
Shrink CSS by stripping comments, collapsing whitespace, and tightening punctuation. See byte savings live.
Developer Tools
JavaScript Minifier
Quick JS minifier that strips comments and collapses whitespace. Best for trusted, simple code snippets.
Developer Tools
User Agent Parser
Identify the browser, OS, and device type from any user-agent string. Detects bots and crawlers too.
Web Tools
NewCron Expression Generator
Build cron expressions from a simple form, or pick a common preset. See plain-English explanations.
Developer Tools
NewNumber Base Converter
Convert between binary, octal, decimal, and hexadecimal. Type in any field and the other three update live.
Developer Tools
NewTOTP Code Generator
Generate time-based one-time passwords (2FA codes) from a Base32 secret. Same algorithm as Google Authenticator.
Security Tools
NewDNS Lookup
Query DNS records (A, AAAA, MX, TXT, NS, CNAME, SOA, CAA) for any domain using Google DNS-over-HTTPS.
Network Tools