🛠️ Developer Tools
Formatters, converters, encoders and searchable references — the utilities that live next to your editor.
All developer tools
JSON Formatter
Beautify, validate and minify JSON with instant error messages.
Regex Tester
Live regex testing with match highlighting and capture groups.
Diff Checker
Compare two texts line by line with highlighted changes.
Cron Expression Generator
Build cron schedules and see them explained with next run times.
UUID Generator
Generate cryptographically secure UUID v4 identifiers in bulk.
Base64 Encoder / Decoder
Encode or decode Base64 with Unicode and URL-safe support.
Unix Timestamp Converter
Convert epoch timestamps to dates and back, in UTC and local time.
URL Encoder / Decoder
Percent-encode or decode URLs and query parameters.
JWT Decoder
Inspect a JWT's header, payload and expiry — fully client-side.
Hash Generator
SHA-1/256/384/512 hashes for text and files, computed locally.
Markdown Previewer
Live side-by-side Markdown editing with HTML export.
HTML Entity Encoder
Escape HTML to entities and decode them back.
Byte Size Converter
Convert bytes ⇄ KB/MB/GB/TB, decimal and binary units.
Image to Base64
Turn images into data URIs with HTML & CSS snippets.
JSON ⇄ CSV Converter
Convert JSON arrays to CSV and back, with proper quoting.
IP Subnet Calculator
Network, broadcast, host range and netmask from any CIDR.
llms.txt Generator
Create and validate llms.txt files for AI crawlers.
Number Base Converter
Binary ⇄ decimal ⇄ hex ⇄ octal, any base 2–36, exact.
Robots.txt Generator
Build a robots.txt — with one-click AI crawler blocking.
Meta Tag Generator
Title, description, Open Graph and Twitter Card tags.
AI Crawler Detector
Identify AI bots from user agents and access logs.
Security.txt Generator & Validator
Create and check an RFC 9116 security.txt file.
AI Search Readiness Checker
Audit pages for AI search, schema, robots and llms.txt.
Schema Markup Generator
Generate JSON-LD for Article, FAQ, local business and app pages.
AI Content Access Policy Generator
Create robots.txt, llms.txt and AI crawler access policy snippets.
Prompt Injection Scanner
Find hidden AI instructions and suspicious prompt text.
AI Citation Snippet Generator
Create concise snippets that AI/search engines can cite.
GEO Content Brief Generator
Plan AI-search-ready pages with entities, FAQs and schema notes.
AI Bot Blocker Rules Generator
Generate .htaccess, Nginx and Cloudflare rules for AI bots.
CSV to JSON
CSV ⇄ objects: quoted fields, headers, any delimiter.
XML Formatter
Pretty-print, minify and validate XML.
CSS Minifier
Compress CSS for production or expand it for reading.
SQL Formatter
Uppercase keywords, one clause per line, clean indent.
JSON ⇄ YAML
Convert config files between JSON and YAML.
Checksum Calculator
CRC32 and Adler-32 checksums of any text.
HTTP Status Codes
Searchable reference for every HTTP status code.
CSS Clamp Calculator
Generate fluid CSS clamp() formulas for type and spacing.
Color Palette Generator
Create tints, shades and CSS variables from one color.
UTM Builder
Create campaign tracking URLs with UTM parameters.
Random Color Generator
Random colors in hex, RGB or HSL with swatches.
HTML Minifier
Strip comments and whitespace from HTML, safely.
Hex Dump Viewer
Classic hex dump of any text's UTF-8 bytes.
JSON Escape
Escape or unescape JSON string literals.
Chmod Calculator
rwx checkboxes ⇄ octal 755 ⇄ rwxr-xr-x notation.
Password Strength Checker
Entropy, crack time and weaknesses — checked locally.
Fake Data Generator
Fake users with names, emails and cities as JSON or CSV.
Luhn Checker
Validate Luhn checksums (cards, IMEI) with working shown.
Regex Cheat Sheet
Searchable regex reference: tokens, examples, flags.
ASCII Table
All 128 ASCII codes with hex, decimal, octal, binary.
Git Cheat Sheet
Searchable Git commands: commit, branch, rebase, undo.
Common Ports
Searchable TCP/UDP port reference: SSH, HTTPS, databases.
About these tools
Format and validate JSON, SQL, XML and CSS; convert between CSV, JSON and YAML; encode, decode, hash and checksum anything; and keep the references you always end up googling — HTTP status codes, common ports, Git commands, regex tokens, the ASCII table — one search box away. Every tool runs entirely in your browser, so pasting proprietary code or production data is safe: nothing is uploaded, logged or stored.
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