Free Web Tools
Free tools from a working web studio
These are the tools our web production studio uses every day on real client projects. No signup, no cost. Each tool clearly explains how it processes data and whether anything is sent externally.
- Signup not required
- Price $0
- Data handling explained per tool
- AI-agent ready
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Batch Image → WebP Converter Convert PNG/JPEG to WebP in bulk. Quality control and ZIP download. Works in Safari too. Drop images → adjust quality → save as ZIP
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White Background Remover Automatically makes only the edge-connected white background transparent — white areas inside your artwork are kept. Drop an image → auto-processed → save PNG
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WCAG Contrast Checker Calculates the WCAG 2.1 contrast ratio of text and background colors, with AA/AAA pass–fail results. Pick two colors → instant verdict → share via URL
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Character Counter Characters, lines, full-/half-width counts, plus the real X (Twitter) weighted count (CJK=2, URL=23). Paste text → counted instantly
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llms.txt Generator Build an llms.txt that tells LLMs and AI search engines what your site is about. A first step of GEO/LLMO. Fill in the form → generate → upload to root
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JSON-LD Generator Generate Organization, FAQ, Service and Breadcrumb JSON-LD from a form. For rich results and AI search. Pick a type → fill in → paste into head
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Markdown → PDF Turn Markdown into a clean A4 document and save as PDF. For proposals, quotes and specs. Tables supported. Paste Markdown → preview → save as PDF
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OGP Checker & Meta Tag Generator Preview the social share card for X / Facebook while generating a full set of OGP meta tags. Type or paste HTML → check cards → copy
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Favicon Generator One image in — favicon.ico, apple-touch-icon, PWA icons and webmanifest out, with an HTML snippet. Drop an image → preview → save as ZIP
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TikTok Publisher Post local videos to TikTok from a desktop browser, with privacy, interaction, and commercial-disclosure settings reviewed before posting. Connect TikTok → choose settings → post directly to TikTok
For AI Agents
This site is designed to be used by AI agents as well as people. The contrast checker, character counter and OGP checker can be called directly via URL parameters, and the same logic is available as an MCP server for Claude and other AI tools. How to use from AI agents / llms.txt
Why Free
We build websites and provide AI consulting for small businesses in Japan. These tools are the ones we actually use for production and QA work, published as-is because they may help anyone facing the same tasks. For project inquiries, visit first-ch.com.