dottools.dev
Developer utilities that just work. Fast, reliable, and always available.
JSON Formatter
Format, validate, and minify JSON data instantly
JWT Decoder
Decode and inspect JSON Web Tokens
Base64 Encode/Decode
Encode or decode text and data in Base64 format
UUID Generator
Generate random UUIDs in bulk with one click
SSL Certificate Tools
View certificate details, build chains, convert formats
Regex Tester
Test regular expressions with live match highlighting
Timestamp Converter
Convert between Unix timestamps and human-readable dates
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes
Password Generator
Create strong, random passwords with custom rules
QR Code Generator
Generate QR codes from text or URLs, download as PNG or SVG
DNS Lookup
Query DNS records across Google, Cloudflare, and NextDNS resolvers
YAML Lint
Validate and format YAML, convert between YAML and JSON
URL Encode/Decode
Encode or decode URLs and query strings
Color Converter
Convert colors between HEX, RGB, and HSL formats
Text Diff Checker
Compare two texts and highlight the differences
Cron Expression Parser
Parse and explain cron expressions in plain English
Lorem Ipsum Generator
Generate placeholder text for designs and mockups
chmod Calculator
Calculate Linux file permissions in numeric and symbolic notation
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal
String Case Converter
Convert text between camelCase, snake_case, kebab-case, and more
Word Counter
Count words, characters, sentences, and estimate reading time
Markdown Preview
Write Markdown and see a live rendered preview side by side
SQL Formatter
Format and beautify SQL queries with syntax highlighting
CSV/JSON Converter
Convert between CSV and JSON formats
HTML Entity Encode/Decode
Encode or decode HTML entities and special characters
Subnet Calculator
Calculate IP subnets, network ranges, and CIDR notation
Open Graph Preview
Preview how your page will look when shared on social media
Robots.txt Tester
Test if a URL path is allowed or blocked by robots.txt rules
Invisible Character Remover
Detect and remove hidden Unicode characters from text