Developer Tools
Free online tools for developers — format JSON, encode Base64, test regex, generate hashes and passwords. All client-side.
Developer tools for programmers, DevOps engineers and students — everything from JSON formatting and Base64 encoding to regex testing, SQL formatting and password generation. Every tool runs 100% in your browser with no uploads, so your code and data never leave your device. Whether you need to debug a JWT, minify JavaScript, validate JSON against a schema or convert Unix timestamps, these free utilities cover the daily workflows of modern developers.
Format & Beautify
Format, validate and beautify the code formats you touch every day — JSON, CSS, SQL, YAML, JavaScript, HTML and XML — with minify modes for production.
JSON Formatter
Format, validate and beautify JSON online. Free JSON formatter with indentation options and key sorting — runs entirely in your browser.
CSS Minifier & Beautifier
Minify CSS to shrink file size or beautify it into readable, indented code. Free online CSS formatter — instant and client-side.
SQL Formatter
Format SQL queries with uppercase keywords and clean clause indentation. Free online SQL beautifier — runs in your browser.
YAML Formatter
Format and validate YAML, or convert between YAML and JSON. Free online YAML formatter for configs, pipelines and Kubernetes files.
JavaScript Beautifier / Minifier
Beautify minified JavaScript into readable code, or minify it to shrink file size. Free online JS formatter — runs entirely in your browser.
HTML Formatter / Minifier
Beautify HTML into readable, indented markup or minify it to shrink file size. Free online HTML formatter, no upload required.
XML Formatter / Validator
Format XML into readable, indented markup or validate it for structural errors. Free online XML formatter and validator.
Encode & Convert
Encode, decode and convert between formats: Base64, URL percent-encoding, HTML entities, number bases, JSON↔XML and string escaping.
Base64 Encode/Decode
Encode text to Base64 or decode Base64 to text instantly. Free online Base64 converter — no upload, everything stays in your browser.
URL Encode/Decode
Encode or decode URLs and query strings online. Free URL encoder/decoder for percent-encoding special characters.
HTML Entity Encoder
Encode special characters as HTML entities or decode entities back to text. Handles named, decimal and hex entities.
Binary/Hex/Decimal Converter
Convert numbers between binary, octal, decimal and hexadecimal instantly — with support for huge integers and 0x/0b prefixes.
JSON to XML Converter
Convert JSON to XML or XML back to JSON, with attributes preserved. Free online JSON ↔ XML converter, no signup required.
String Escape / Unescape
Escape or unescape strings for JavaScript, JSON, HTML, SQL or CSV contexts. Free online string escaping tool, runs in your browser.
Generate & Test
Generate strong passwords, hashes, regexes, UUIDs, cron schedules and mock data — and test regex patterns against live sample text.
Password Generator
Generate strong, random passwords with custom length, uppercase, numbers and symbols. Secure client-side generation — nothing leaves your device.
Hash Generator
Generate SHA-256, SHA-384, SHA-512 and SHA-1 hashes from text using the Web Crypto API. Fast, free and fully client-side.
Regex Tester
Test regular expressions against sample text with live match highlighting, flags and capture groups. Free online regex tester.
Regex Generator
Get battle-tested regular expressions for emails, URLs, IPs, dates, passwords and more — with flags and anchoring options, ready to copy.
UUID Generator
Generate cryptographically random version 4 UUIDs — one or a thousand at a time, with uppercase and no-dash options. Free and instant.
Cron Expression Generator
Build and understand cron expressions with instant plain-English descriptions and common presets. Free cron schedule generator.
Mock Data Generator
Generate realistic fake names, emails, addresses and more as JSON or CSV — perfect for testing and demos. Free online mock data generator.
Parse & Inspect
Inspect what's inside your data: decode JWT tokens, convert Unix timestamps, split URLs into components, parse user-agent strings and look up HTTP status codes.
JWT Decoder
Decode JWT tokens online — view the header, payload and expiry instantly. Fully client-side, your token never leaves the browser.
Timestamp Converter
Convert Unix timestamps to human-readable dates and back — auto-detects seconds vs milliseconds and shows local, UTC, ISO and relative time.
URL Parser / Query String Splitter
Break a URL into its protocol, host, path, hash and individual query parameters. Free online URL parser, runs entirely client-side.
User-Agent Parser
Parse a User-Agent string into browser, engine, OS and device details instantly. Free online User-Agent parser and analyzer.
HTTP Status Code Lookup
Search every HTTP status code by number, name or keyword and see what it means. Free, searchable HTTP status code reference.
Security & Permissions
Hashing and access-control utilities: bcrypt hash generation and verification, plus Unix chmod permission calculation in octal or symbolic form.
Bcrypt Hash Generator / Verifier
Hash a password with bcrypt or verify a password against an existing bcrypt hash. Free online bcrypt tool, computed entirely client-side.
Chmod Calculator
Convert Unix file permissions between checkboxes, symbolic notation (rwxr-xr-x) and octal (755). Free online chmod calculator.