Developer tools
Utilities to speed up everyday development work.
Developer tools directory
JSON Formatter
Format, validate and minify JSON in one click.
XML Formatter
Format and validate XML documents.
HTML Minifier
Minify, optimize and validate HTML in one workspace.
JavaScript Minifier
Minify, beautify and analyze JavaScript safely.
CSS Minifier
Minify, beautify and analyze CSS safely.
Hash Generator
MD5 + SHA-1/256/384/512 of text or file, with HMAC support.
Regex Tester
Test, debug and build regular expressions in real time.
JWT Decoder
Decode, inspect and verify JSON Web Tokens.
Secure Notes Tool
Password-encrypted notes that never leave your browser.
Clipboard Manager
Save, search and re-use your clipboard history.
Internet Speed Test
Measure your download, upload, ping and jitter.
Ping Test Tool
Measure round-trip latency to any host from your browser.
IP Address Finder
See your public IP, location, ISP and network details.
DNS Lookup Tool
Resolve A, AAAA, MX, TXT, CNAME, NS, SOA and CAA records.
Browser Information Checker
See your browser, locale, permissions and web-API support.
Device Information Checker
Detect device type, OS, screen, GPU and hardware specs.
Battery Status Checker
See your battery level, charging state and remaining time.
Screen Resolution Checker
Detect screen size, viewport, DPR, color depth and refresh rate.
Keyboard Tester
Test every key on your keyboard — instantly, in the browser.
Mouse Click Tester
Test every mouse button, double-click, scroll and CPS.
Mic Test Tool
Live mic level, waveform and quick record-and-playback.
Webcam Test Tool
Live webcam preview with resolution, FPS, snapshots and record.
Text Diff Checker
Compare two texts side-by-side with highlighted differences.
Duplicate Line Remover
Remove duplicate lines from any text or list.
Line Sorter
Sort lines alphabetically, numerically, by length or randomly.
Secure File Shredder
Overwrite a file's bytes with crypto-random data before download.
Session ID Generator
Generate cryptographically random session tokens.
API Key Generator
Generate Stripe-, GitHub- and OpenAI-style API keys.
Encryption Key Generator
Generate AES, RSA, ECDSA, ECDH and HMAC keys via Web Crypto.
JWT Generator
Sign and generate HMAC JSON Web Tokens.
Cron Time Translator
Translate cron expressions into English + next runs.
Cron Job Expression Generator
Build cron expressions with a visual field editor.
Regex Generator
Curated regex library + visual builder + live tester.
SQL Formatter
Beautify SQL with proper indentation and uppercase keywords.
SQL Query Beautifier
Column-aligned SQL formatter — keyword case, comma style, indent, SELECT alignment.
TOML Formatter
Parse, validate and pretty-print TOML configuration.
Code Screenshot Generator
Render code as a shareable PNG — six themes, eight languages, line numbers, window chrome.
Terminal Command Cheat Sheet
Searchable reference — Bash, Git, Docker, networking, macOS, Linux.
Keyboard Shortcut Generator
Build sectioned cheat sheets — styled `<kbd>` chips, Markdown + plain-text export.
API Response Viewer
Auto-detect JSON / XML, collapsible tree, JSONPath/XPath search.
HTTP Header Checker
Paste a response and audit security, caching, CORS and content headers.
MIME Type Checker
Magic-byte detection — true MIME from the file's first 512 bytes.
Website Source Viewer
Paste HTML, prettify + extract outline, scripts, styles, links, images, meta tags.
MAC Address Lookup
Find the vendor + classification for any MAC address.
UUID Validator
Verify any UUID and detect its version (v1-v8).
SSL Certificate Checker
Paste PEM — parse X.509 v3, days-till-expiry, SAN, key bits, SHA-256 fingerprint.
Duplicate File Name Cleaner
Find duplicate file names and propose unique renames.
File Metadata Viewer
Pick a file — name, size, MIME sniff, dimensions, duration, SHA-256, hex dump.
EXIF Data Remover
Strip EXIF/IPTC/ICC from JPEG losslessly + PNG/WebP via re-encode.
Unicode Character Finder
Curated Unicode catalogue with code-point and escape lookups.
Keyboard Layout Visualizer
Compare QWERTY, Dvorak, Colemak, AZERTY, Workman + finger load analyser.
Fake JSON Data Generator
Schema-driven fake JSON for mocking APIs (crypto-strong randomness).
SQL Dummy Data Generator
Schema-driven INSERT statements for PostgreSQL / MySQL / SQL Server.
Random File Generator
Generate test files up to 100 MB — text, lorem, binary, zeros or PNG noise.
Broken Link Checker
Paste HTML — catch empty hrefs, placeholders, mixed content, missing noopener, tracking-params.
Meta Tag Analyzer
Holistic SEO meta audit — score, breakdown by category, every meta tag explained.
Redirect Chain Checker
Paste `curl -IL` output — every hop's status, Location, server, signals.
Canonical URL Checker
Paste HTML; audit canonical, og:url, twitter:url, hreflang and normalise URLs.
Mobile-Friendly Test
Paste HTML — score 0-100 across viewport, tap targets, fonts, plugins, fixed widths.
Website Cache Checker
Paste HTTP response — deep Cache-Control + ETag + Vary + CDN-cache-status audit.
CDN Checker
Fingerprint the CDN from response headers — Cloudflare, Fastly, Akamai, CloudFront, Vercel, more.
SSL Expiry Reminder
Paste a PEM cert — generate a calendar reminder (.ics) before it expires.
Website Uptime Monitor
Browser-side poller — track a list of URLs, see live up/down timeline.
Domain Age Checker
Paste WHOIS — extract creation / expiry, compute age + days-till-expiry.
DKIM Record Checker
Paste DKIM TXT — validate tags, RSA key length, allowed hashes + service types.
DMARC Record Checker
Paste DMARC TXT — validate policy, alignment, percentage, report URIs; 0-100 score.