The dev toolbox
you've been looking for.
โWorks on my machine. ยฏ\_(ใ)_/ยฏโ
Fast, free, private. Every tool runs entirely in your browser โ no login, no tracking, no server calls.
โ Featured
JSON Formatter
Format, validate and minify JSON instantly
JWT Generator
Create and sign JWTs with custom claims in-browser
Regex Tester
Test and debug regular expressions with live highlighting
Diff Checker
Compare two texts and highlight differences
Color Palette Generator
Generate harmonious color palettes from any base color
AES / RSA Encryption
Encrypt and decrypt text using AES-GCM and RSA-OAEP
Format
Encode
Base64 Encoder/Decoder
Encode or decode Base64 strings instantly
URL Encoder/Decoder
Encode and decode URLs and query parameters
JWT Decoder
Decode and inspect JWT tokens instantly
Hash Generator
Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes
HTML Entity Encoder
Encode and decode HTML entities and special characters
Image to Base64
Convert images to Base64 data URIs for embedding
Generate
Lorem Ipsum Generator
Generate placeholder text for your designs
Password Generator
Generate strong, random passwords with custom rules
UUID Generator
Generate RFC 4122 v4 UUIDs in bulk
JSON to TypeScript
Auto-generate TypeScript interfaces from JSON objects
QR Code Generator
Generate QR codes from any URL or text
JWT Generator
Create and sign JWTs with custom claims in-browser
Git Command Generator
Find and copy git commands fast โ search, filter by category, with warnings
Markdown Table Generator
Build Markdown tables visually โ edit cells, align columns, export as HTML
Meta Tags Generator
Generate Open Graph, Twitter Card, and SEO meta tags with live previews
Convert
Color Converter
Convert between HEX, RGB, and HSL color formats
Timestamp Converter
Convert Unix timestamps to human-readable dates
Number Base Converter
Convert numbers between binary, octal, decimal, and hex
String Case Converter
Convert text between camelCase, snake_case, kebab-case and more
JSON โ YAML Converter
Convert between JSON and YAML formats instantly
IP / CIDR Calculator
Calculate subnet masks, IP ranges, and host counts from CIDR notation
Docker Run to Compose
Convert docker run commands to docker-compose.yml and back
cURL to Code
Convert cURL commands to Python, JavaScript, PHP, Go, Java, C# and Ruby instantly
Test
Regex Tester
Test and debug regular expressions with live highlighting
Diff Checker
Compare two texts and highlight differences
CRON Expression Tester
Parse cron expressions and preview upcoming run times
HTTP Request Builder
Build and send HTTP requests like a lightweight Postman
YAML / TOML / JSON Validator
Validate and convert between YAML, TOML, and JSON formats
Text Diff
Inline character-level diff between two short texts
XPath Tester
Test XPath expressions against XML and HTML with live results
Design
Reference
Why ToolNinja
Private by default
Your code and data never leave the browser. No server calls, no logs, no telemetry of any kind.
Zero setup
Open a tool and start working. No installs, no accounts, no configuration required.
Built for depth
Tools go deep โ match tables, tree views, char-level diffs, WebCrypto, JSONPath, CIDR math.
Works offline
All logic runs in your browser. Once loaded, no internet connection required.