General
Chmod calculator
A visual diff tool to compare text and code
An epoch/unix timestamp converter
Analyse unicode strings
Graphical
Upscale images using DCNN
Remove bloat and unnecessary markup from SVGs
Network
Autonomous system number lookup
Domain name system lookup
Domain name system propagation checker
Delegation signer lookup
Lookup details about an IP address
Whois domain name & IP lookup
Programming
Unique identifier collision calculator
Benchmark JavaScript
Minify JavaScript
Obfuscate JavaScript
Format and repair broken JSON
Create types for Rust, Kotlin, TS and JSON schema
A visualizer for JSON
Check regular expressions for DOS vulnerabilities
Syntax checker for JS, TS, JSON, CSS and HTML
Test websocket connection and send/receive data
Security
Search for compromised accounts
Check if your password has been leaked
Create secure passwords
Generate RSA keys
Website
See the global/browser support for a feature
See when domains expire
See how well your website performs
View SSL certificate details
Identify technology on websites