Developer Tools
Privacy-first developer utilities. Run regular expression tests, parse query strings, format metadata, or consult lookup reference tables.
Bookmarked
Regex Tester & Explainer
Test, analyze, and validate regular expressions with live match highlighting.
URL Parser & Query Builder
Deconstruct URLs and build query strings with editable key-value pairs.
User Agent Parser
Analyze your browser user-agent or parse custom UA strings.
Meta Tag & OG Generator
Generate standard and Open Graph meta tags for website SEO optimization.
robots.txt Generator
Create search-crawler ready robots.txt configurations.
HTTP Status Codes
Quick search reference table of standard HTTP status codes.
MIME Types Reference
Searchable database of file extensions and MIME headers.
ASCII Table Chart
Complete reference chart of standard ASCII characters and representations.
HTML Entities Reference
Searchable index of special characters and HTML codes.
Git Command Reference
Common Git commands cheat sheet with explanations.
Linux Command Reference
Searchable cheat sheet of common Linux terminal commands.
Common Keyboard Shortcuts
Reference guide of essential keyboard shortcuts for developers.
Keycode Tester
Press any key to see its KeyboardEvent key, code, and keyCode values.
Viewport & DPR Detector
Show your current viewport size, device pixel ratio, and screen dimensions.
Chmod Calculator
Interactive Unix file permission calculator for numeric and symbolic modes.
IP Subnet Calculator
Calculate network details, usable hosts, and subnet masks from IP/CIDR.
cURL to Code Converter
Convert cURL commands to requests in Python, JS, Node, PHP, Go, Ruby, and Java.
Code & Text Diff Checker
Compare two code snippets or text files side-by-side with inline change highlighting.
Font Preview & Glyph Inspector
Inspect TTF, OTF, WOFF files with custom preview text and glyph grids.
Font to Base64 & Web Formatter
Convert font files to Base64 data URIs and generate ready-to-use CSS @font-face rules.
EPUB Reader & Book Viewer
Read EPUB e-books directly in your browser with chapter navigation and adjustable typography.
In-Browser SQLite Viewer & Query Runner
Open, browse tables, and execute SQL queries on .sqlite and .db files locally in your browser.
Cron Expression Generator & Human Translator
Build cron schedule expressions visually, translate them to plain English, and calculate upcoming run dates.
DNS Record Lookup & Inspector
Query A, AAAA, CNAME, MX, TXT, NS, and SOA records directly in your browser using DNS over HTTPS.
Regex Railroad Diagram Visualizer
Generate interactive SVG railroad syntax diagrams from any regular expression pattern.
In-Browser REST API Client
Send HTTP requests directly from the browser with custom headers and bodies.
HTML to React JSX Converter
Quickly transform standard HTML markup into React JSX with auto-converted attributes.
More coming soon
We are building new browser-based tools every week.