Free online developer tools: token counter, converters and more
Free, fast, and privacy-focused tools for developers and content creators. Everything runs in your browser, your data never leaves your device.
Whether you're a developer working with AI models, a content creator managing text limits, or a professional who needs quick file conversions, xcb tools provides the utilities you need. Our platform is designed for developers and content creators who value privacy and efficiency. Each tool is carefully crafted to run entirely in your browser, ensuring your data remains private and processing is instant.
Latest additions
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AI Token Counter
toolCount tokens, words, and characters for LLM prompts. Supports GPT-3.5, GPT-4, and Claude models. Runs entirely in your browser.
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Carbon
toolCreate and share beautiful images of your source code. Customize the theme, font, and window style, then export as PNG or SVG.
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CSS Grid Generator
toolVisual CSS Grid builder: set columns, rows, and gaps, then drag and drop elements to design a layout. Exports ready-to-use HTML and CSS with one click.
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CSS Layout Generator
toolPick from common CSS Grid templates (Holy Grail, sidebar, 3x3) or Flexbox patterns (row wrap, fill space) and get the matching CSS instantly.
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Excalidraw
toolVirtual whiteboard for sketching hand-drawn-like diagrams. Great for architecture diagrams, wireframes, and quick system designs.
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Godly
toolCurated gallery of standout website design for visual inspiration, browsable by category — web, branding, product, typography, motion, and more.
Latest from the blog
Learn about AI tokens, LLM optimization, and developer tools.
PDF to Markdown for LLMs: Why Your PDF Costs 3x More Than It Should
Sending a PDF straight to an LLM can cost several times what the same content costs as Markdown. Here's why, which converter to use, and when to skip conversion entirely.
Read more →What Are LLM Tokens? How AI Models Actually Count Your Text (2026)
What a token really is, why the same sentence costs different amounts on ChatGPT, Claude, and Gemini, and how to read 2026's pricing and context-window numbers.
Read more →What Is a Context Window? Why 1M Tokens Doesn't Mean 1M Usable Tokens
Context windows hit 1M tokens in 2026 — but research across 18 frontier models shows accuracy collapses long before the limit. What the number means, and what it doesn't.
Read more →