Free Online Tools

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Word Counter

Count words, characters, sentences and paragraphs instantly. Free online word counter, no signup required.

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Lorem Ipsum Generator

Generate lorem ipsum placeholder text instantly — paragraphs, sentences or words. Free online lorem ipsum generator, no signup required.

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Character Counter

Count characters, words, lines and spaces instantly. Free online character counter, no signup required.

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Case Converter

Convert text to uppercase, lowercase, title case, sentence case, camelCase or snake_case instantly. Free online case converter.

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Text Diff Checker

Compare two texts and highlight differences instantly. Free online diff tool, no signup required.

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Duplicate Line Remover

Remove duplicate lines from any text instantly. Free online duplicate line remover with trim and case options, no signup required.

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AI Text Cleaner

Clean text from ChatGPT, Claude or Gemini: remove hidden characters, replace em dashes and smart quotes, strip Markdown. Free and private.

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JSON Formatter

Format, validate and minify JSON instantly. Free online JSON formatter with syntax error detection, no signup required.

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Base64 Encoder / Decoder

Encode or decode Base64 strings instantly in your browser. Free online Base64 encoder and decoder, no signup required.

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URL Encoder / Decoder

Encode or decode URLs and query strings instantly. Free online URL encoder and decoder, no signup required.

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MD5 Hash Generator

Generate MD5 hashes from any text instantly in your browser. Free online MD5 generator, no signup required.

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HTML Entity Encoder / Decoder

Encode or decode HTML entities instantly. Convert <, >, &, " to HTML entities and back. Free online tool.

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JWT Decoder

Decode and inspect JWT tokens instantly. View header, payload and signature. Free online JWT decoder, no signup.

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Regex Tester

Test and debug regular expressions instantly with match highlighting. Free online regex tester, no signup.

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Keyword Density Checker

Analyze keyword density and frequency in any text. Free online keyword density checker, no signup required.

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Meta Tag Generator

Generate SEO-optimized meta tags, Open Graph and Twitter Card tags instantly. Free online meta tag generator, no signup required.

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SERP Preview

Preview how your page looks in Google search results. Check title length, URL and meta description. Free online SERP preview.

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Robots.txt Generator

Generate a robots.txt file for your website instantly. Control search engine crawling. Free online tool, no signup.

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Slug Generator

Convert any text into a clean URL slug instantly. Free online slug generator with custom separator options, no signup.

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Sitemap Generator

Generate an XML sitemap for your website instantly. Free online sitemap generator, no signup required.

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llms.txt Generator

Create or validate an llms.txt file for your website in the llmstxt.org format: summary, sections and links for AI agents. Free, in your browser.

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Token Counter

Count tokens for ChatGPT, Claude and Gemini models. Exact OpenAI counts, cost per request and context window usage. Free, runs in your browser.

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AI Cost Calculator

Estimate and compare monthly API costs for ChatGPT, Claude, Gemini, DeepSeek and more, from official per-token prices. Free online calculator.

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AI Model Comparison

Compare ChatGPT, Claude, Gemini, DeepSeek and Llama models side by side: context window, price per 1M tokens and image input. Free.

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System Prompt Builder

Build a structured system prompt for ChatGPT, Claude or Gemini: role, context, instructions, format and constraints, as Markdown or XML tags. Free.

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Context Window Visualizer

See how much of an LLM context window your system prompt, history, RAG context and response use. Type token counts or paste text. Free.

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Prompt to cURL

Convert your prompt into ready-to-run cURL, Python or Node.js code for OpenAI, Anthropic and Google APIs. Free online tool.

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llms.txt Generator

Create or validate an llms.txt file for your website in the llmstxt.org format: summary, sections and links for AI agents. Free, in your browser.

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JSONL Validator

Validate and inspect JSONL files for AI fine-tuning datasets. Free online JSONL validator for OpenAI, Anthropic and Mistral formats.