Developer Tools
Format, validate, convert, and inspect code or structured data.
All tools
28 tools in this categoryJSON Formatter & Validator
Validate, format, or minify JSON with syntax highlighting and clear parse errors in your browser.
Base64 Encoder & Decoder
Encode UTF-8 text as Base64 or decode a Base64 string back to text in your browser.
URL Encoder & Decoder
Percent-encode URL text or decode encoded strings in your browser.
Hash Generator (SHA-1, SHA-256, SHA-512, MD5)
Generate SHA-1, SHA-256, SHA-384, SHA-512 and MD5 hashes from any text. Runs locally in your browser.
JWT Decoder & Inspector
Decode a JSON Web Token to inspect its header, payload, and signature data in your browser. This does not verify the signature.
Regex Tester & Debugger
Test regular expressions against sample text with real-time match highlighting and capture groups.
UUID & GUID Generator
Generate one or more cryptographically secure UUID v4 / GUID identifiers in your browser.
Unix Timestamp Converter
Convert Unix epoch timestamps to human-readable dates and back. Supports seconds, milliseconds, and ISO 8601.
CSS Minifier & Beautifier
Minify CSS to shrink file size, or beautify minified CSS to make it readable. Instant, browser-side.
CSS Gradient Generator
Design linear or radial CSS gradients with multiple color stops, preview them, and copy the CSS.
CSS Box-Shadow Generator
Adjust offset, blur, spread, color, and inset for a CSS box shadow, then copy the result.
HTML Viewer & Live Preview
Paste HTML and preview it in a sandboxed frame, with an explicit option to allow or block scripts.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal as you type in your browser.
.gitignore Generator
Build a .gitignore from curated templates for Node, Python, Java, macOS, Windows, editors, and more. Free and offline.
JSON to YAML to CSV to XML Converter
Convert structured data between JSON, YAML, CSV, and XML in either direction without uploading it.
Text & JSON Diff Checker
Compare two blocks of text or JSON, highlight added and removed lines, and optionally normalize JSON first.
HTTP Status Codes & MIME Types Reference
Search every HTTP status code and common MIME (content) type by number, name, or extension. Fast, offline developer reference.
Secret Key Generator
Generate server-side cryptographic secrets and session keys in hex or Base64. Signed-in users receive up to 20 generations per day.
Cron Expression Builder & Explainer
Build and validate cron expressions, read a plain-language explanation, and preview upcoming run times.
SQL Formatter & Beautifier
Format SQL queries into readable, consistently indented code in your browser.
JSON to TypeScript Converter
Generate reusable TypeScript interfaces from JSON, including nested objects and arrays, in your browser.
AI i18n Translator
Translate localization files while preserving every key.
.env Configuration Checker
Compare .env.example against production and find gaps.
Data Cleanup Studio
Clean spreadsheet columns and verify email addresses and phone numbers.
BIN / Card Lookup
Identify cards by BIN — scheme, type, bank, and country.
Website to Markdown Converter
Convert the main content of a public static HTML page to clean Markdown.