Free tools for text, code, color, and more.

Word Counter

Count words, characters, sentences, and paragraphs in your text

Text Case Converter

Convert text between uppercase, lowercase, title case, and more

URL Encoder/Decoder

Encode and decode URLs with percent encoding

Meta Tag Generator

Generate SEO meta tags for your website

Sitemap Generator

Generate XML sitemaps for search engines

Robots.txt Generator

Create robots.txt files for search engine crawlers

Keyword Density Checker

Analyze keyword density in your content

Social Media Link Preview

Preview how your links appear when shared on different social platforms

Base64 Encoder/Decoder

Encode and decode Base64 strings

JSON Formatter

Format and validate JSON data

Hash Generator

Generate MD5, SHA1, SHA256 hashes

UUID Generator

Generate unique identifiers (UUIDs)

QR Code Generator

Generate QR codes for URLs, text, and more

Regex Tester

Test and debug regular expressions

Color Picker

Pick colors and get hex, RGB, HSL values

Color Converter

Convert between HEX, RGB, HSL, and CMYK

Gradient Generator

Create beautiful CSS gradients

Age Calculator

Calculate your exact age in years, months, and days

Time Zone Converter

Convert time between different time zones

Password Generator

Generate secure random passwords

Invoice Generator

Create professional invoices with advanced features

JWT Decoder

Decode, inspect, and verify JSON Web Tokens — entirely in the browser

Cron Expression Builder

Build, test, and explain cron schedules with next-run preview

Markdown ↔ HTML Converter

Bidirectional Markdown ↔ HTML with live preview

CSV ↔ JSON Converter

Bidirectional CSV ↔ JSON with auto delimiter detection and RFC 4180 quoting

Image Compressor & Resizer

Resize and compress images to WebP/JPEG/PNG in the browser

Unit Converter

Convert length, weight, volume, area, speed, time, data, and temperature

Timestamp / Epoch Converter

Convert Unix epoch ↔ human dates across every major time zone

Diff Patch Applier

Apply unified diffs or copy-patch output to an original document

Barcode Generator

Generate Code 128 and EAN-13 barcodes with SVG / PNG export

Token Counter

Count tokens across GPT-5, Claude 4, Gemini 2.5, Llama 4 with live cost estimation

LLM Price Comparison

Live pricing table for every frontier LLM — GPT, Claude, Gemini, Llama, DeepSeek, Mistral

System Prompt Linter

Grade and improve your LLM system prompt — clarity, structure, token bloat, common anti-patterns

llms.txt Generator

Build a spec-compliant llms.txt file — give LLMs a curated map of your site's best content

AI Crawler Visibility Checker

See exactly what GPTBot, ClaudeBot, PerplexityBot see on your site — robots.txt verdict + content

Context Window Calculator

See how your text fits across every LLM's context window with a live token visualizer

MCP Server Validator

Validate your Model Context Protocol manifest — required fields, tool schemas, description quality

JSON → TypeScript / Zod / Schema

Paste JSON, get TypeScript interfaces, Zod schemas, or JSON Schema for LLM function-calling

curl Converter

Convert curl commands to fetch, axios, Python requests, Go net/http, or Node.js

SVG → JSX Converter

Convert SVG to React, React Native, Vue, or Svelte components with proper attribute conversion

HTTP Status Code Reference

Every HTTP status code — 1xx to 5xx — with RFC 9110 citations and real-world examples

Regex Explainer

Dissect any regex into a token-by-token plain-English breakdown

Favicon Generator

Upload one image, get all 10 favicon sizes + manifest.json + HTML snippet

OG Image Generator

Create 1200×630 Open Graph social-share images with title, subtitle, and gradient presets

GEO Audit Score

0-100 score on AI-era signals — llms.txt, JSON-LD, robots.txt AI rules, content depth, hreflang

UTM Campaign Builder

Build Google-Analytics-compliant UTM tagged URLs with validation and autocomplete

Financial Calculator Suite

Tip, loan, mortgage PITI, ROI/CAGR, and compound interest — all in one tool

A/B Test Sample Size Calculator

Compute sample size + days-to-significance for conversion rate experiments