JSON ⇄ CSV Converter
Convert JSON arrays to CSV and CSV back to JSON with auto headers and custom delimiters.
JSON ⇄ XML Converter
Convert JSON to XML or XML to JSON, preserving attributes and nested structures.
YAML ⇄ JSON Converter
Convert YAML configuration to JSON or JSON back to YAML with full nesting support.
Regex Tester
Test regular expressions with live match highlighting, capture groups, and flags.
JWT Decoder
Decode and inspect JWT header, payload, claims, and expiry — all in your browser.
Hash Generator
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes via the Web Crypto API.
UUID Generator
Generate cryptographically secure UUID v4 identifiers — single or in bulk.
URL Encoder / Decoder
Percent-encode URLs and query parameters or decode encoded URLs back to text.
Base64 Encoder / Decoder
Encode text or files to Base64, or decode Base64 back to plain text or binary.
HTML Entities Encoder
Encode special characters to HTML entities or decode entities back to plain text.
Cron Expression Builder
Build, validate and explain cron expressions in plain English with next-run preview.
CSS Gradient Generator
Create linear and radial gradients with live preview and copy ready-to-use CSS.
Box-Shadow Generator
Adjust offset, blur, spread, color and inset with live preview, then copy CSS.
Color Picker & Converter
Pick any color and convert between HEX, RGB, HSL and CMYK formats instantly.
Placeholder Image Generator
Generate placeholder images of any size with custom colors, text and format.
Markdown ⇄ HTML
Bidirectional Markdown / HTML converter with live preview, GFM tables and code blocks.
.htaccess Redirect Generator
Build Apache 301/302 redirects with regex, exact path or wildcard rules.
Fun Ipsum Generator
Generate themed placeholder text — pirate, hipster, bacon, cupcake and more.
JSON Diff Tool
Compare two JSON documents, show added / removed / changed keys with deep recursive diff.
JSON to TypeScript
Paste JSON → output TypeScript interface, Python @dataclass, C# class, or Java POJO.
SQL ↔ JSON Converter
Convert INSERT statements to JSON arrays and back to parameterized SQL.
CSV Viewer / Formatter
Paste CSV → render as sortable, filterable HTML table with delimiter detection.
Diff Checker (Code)
Side-by-side or unified line diff for two text/code blobs, syntax-aware.
Bcrypt Generator
Hash any string with bcrypt (configurable cost factor) and verify hashes.
User-Agent Parser
Parse any User-Agent string → browser, version, OS, device type, engine.
Tailwind Color Palette Generator
Pick a base color → generate full Tailwind 50–950 shade scale.
\nFrequently Asked Questions
Are these developer tools free?
Yes, all 18 developer tools are completely free with no sign-up required. They run entirely in your browser, so your data never leaves your device.
Do the tools work offline?
After the page loads, most tools work without an internet connection since all processing happens locally in JavaScript using browser APIs.
Can I convert JSON to CSV and back?
Yes, the JSON to CSV Converter handles both directions. It auto-detects headers, supports nested objects, and lets you customize delimiters.
Is the JWT Decoder safe to use?
Yes, the JWT decoder runs entirely in your browser. Your tokens are never sent to any server, making it safe for inspecting production tokens.
What hash algorithms are supported?
The Hash Generator supports MD5, SHA-1, SHA-256, and SHA-512 using the Web Crypto API built into modern browsers.