Developer Tools & AI Utilities

Count tokens and estimate API costs across all major LLMs

Compare real-time pricing across 30+ AI models

Optimize and improve your AI prompts for better results

Detect AI-generated text and get a human-likeness score

Visualize how much context window you're using per model

Side-by-side comparison of speed, cost, and quality benchmarks

Test your system prompt against common injection attacks

Build and export API requests for Claude, OpenAI, and Gemini

Plot text embeddings in 2D space to see semantic similarity

Preview chunking strategies and estimate embedding costs

Format, validate, and explore JSON with a tree view

Test regular expressions with live match highlighting

Encode or decode Base64 strings and files

Decode and inspect JWT tokens without a server

Encode or decode URL components and query strings

Encode and decode HTML entities

Convert Unix timestamps to dates and vice versa

Generate UUID v1, v4, v5, and v7 identifiers

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes

Compare two texts and highlight the differences

Live Markdown editor with rendered preview

Build cron schedules visually with human-readable output

Convert colors between HEX, RGB, HSL, HSV, and OKLCH

Build beautiful CSS gradients visually

Generate placeholder text by words, sentences, or paragraphs

Format JavaScript, TypeScript, HTML, CSS, Python, SQL, and more

Minify JavaScript, CSS, and HTML for production

Turn code snippets into beautiful shareable images

Format and beautify SQL queries

Convert between YAML and JSON formats instantly

Convert between TOML and JSON formats

Convert between CSV and JSON with column mapping

Convert between Markdown and HTML

Auto-generate a Markdown TOC from headings with anchor links

Visual editor to create and format Markdown tables

Create shields.io badges for your README with live preview

Export Markdown as styled PDF or HTML with theme selection

Create flowcharts, sequence diagrams, and more with Mermaid.js

Count words, characters, sentences, paragraphs, and reading time

Convert text between camelCase, snake_case, UPPER_CASE, and more

Escape and unescape strings for JSON, HTML, regex, and SQL

Generate realistic fake names, emails, addresses, and more

Generate strong, configurable passwords with entropy display

Generate QR codes for text, URLs, WiFi, and vCards

Convert text to URL-friendly slugs

Generate HTML meta tags and preview social cards

Preview how any URL looks when shared on social media

Build a robots.txt file with a visual rule builder

Generate an XML sitemap from a list of URLs

Inspect HTTP response headers for any URL

Check SSL certificate details, validity, and expiry

Query DNS records: A, AAAA, MX, CNAME, TXT, NS, and more

View your IP address and browser/device information

Compress images client-side without uploading to a server

Resize images to exact dimensions, client-side

Convert images to Base64 data URIs for inline embedding

Optimize and minify SVG files for the web

Generate favicons in all sizes from text or an image