About DevTools Suite
Free, private, browser-based tools for developers and technical users.
DevTools Suite is a free collection of developer productivity tools that run entirely in your browser. No login required. No data sent to servers. No tracking of your content. Open a tool, use it, close it — your data stays on your device.
Our philosophy
Privacy first
All processing happens locally in your browser. Your code, tokens, JSON, and checklist data never leave your device.
Zero friction
Open a tool and start using it immediately. No accounts, no onboarding, no paywalls, no cookie popups.
Fast
Lightweight static pages with minimal JavaScript. Optimized for instant load times and smooth interactions.
Accessible
Keyboard navigation, screen reader support, and first-class dark and light mode across all tools.
Tools available
Smart Checklist
Simple and Advanced modes — flat lists or 3-level nested tasks with progress tracking, drag-and-drop, PDF/Markdown/JSON/CSV export, and shareable URLs.
JSON Formatter
Prettify, minify, validate and explore JSON with syntax highlighting.
Cron Generator
Build and validate cron expressions visually with next-execution previews.
Diff Checker
Compare two texts side by side with line, character, and JSON diff modes.
JWT Decoder
Decode JWT tokens and inspect header, payload, and expiry claims.
Regex Tester
Test regular expressions live with match highlighting and replace preview.
Base64 Encoder / Decoder
Encode and decode Base64 strings and files entirely in the browser.
UUID Generator
Generate cryptographically random UUID v4 values in bulk with copy support.
URL Encoder / Decoder
Percent-encode URLs or decode encoded URL strings in real time.
Markdown Previewer
Write Markdown with a live GitHub-style preview. Sanitized and real-time.
SQL Formatter
Beautify or minify SQL queries with dialect-aware formatting.
Color Converter
Convert colors between HEX, RGB, HSL, and HSV with a live color picker.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes using browser-native Web Crypto.
YAML ↔ JSON Converter
Convert between YAML and JSON with validation and pretty-printing.
JSON → TypeScript
Generate typed TypeScript interfaces from JSON with nested object support.
CSV ↔ JSON Converter
Convert CSV to JSON or JSON arrays to CSV. Upload files or paste directly.
Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa across timezones.
Case Converter
Convert text between camelCase, snake_case, PascalCase, kebab-case, and more.
Password Generator
Generate cryptographically secure passwords with configurable length and character sets.
JWT Generator
Sign and build JWT tokens with custom headers, payloads, and HS256/HS384/HS512 algorithms.
XML Formatter
Pretty-print or minify XML with validation and error line numbers.
QR Code Generator
Generate QR codes from any text or URL. Download as PNG with adjustable size.
JSON → Zod Schema
Generate typed Zod schemas from JSON with strict mode and inferred TypeScript types.
Flexbox Playground
Visually configure CSS Flexbox properties and copy the generated CSS output.
API Request Builder
Build and send HTTP requests from your browser. Inspect responses and import cURL commands.
JSON Schema Generator
Generate JSON Schema draft 2020-12 from any JSON object with nested support.
Bcrypt Generator
Hash and verify passwords with bcrypt entirely in the browser. Adjustable salt rounds.
OpenAPI Viewer
Paste or upload an OpenAPI 3.x spec and browse endpoints, parameters, and responses.
Tailwind Playground
Write HTML with Tailwind classes and preview the result live with desktop/mobile toggle.
JSON → Dart Models
Generate Dart model classes from JSON with null safety and fromJson/toJson support.
JSON → C# Classes
Generate C# classes from JSON with PascalCase, nullable types, and namespace support.
Docker Compose Formatter
Beautify or minify docker-compose YAML with human-friendly validation errors.