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Free tools

Small, exact tools for people who fetch the web for a living. Five run entirely in your browser and never upload what you paste; five fetch through our scraping API from a residential IP, with a free daily quota and no account. Each page says which it is.

By , founder of QuanticData · Published · Updated

The ten free tools split by where they work: five run entirely in your browser tab with zero requests, five call one demo endpoint; the same jobs from code cost $0.0002 a page or $0.0012 an audit.
The split the tools page describes, drawn: five tools whose work is a function chain in your own tab, and five that have to fetch something you do not have locally — free per visitor here, $0.0002 a page or $0.0012 an audit from the API.
AI Visibility AuditCan ChatGPT, Claude, Perplexity, AI Overview or Copilot read and cite this page? 24 AI crawlers in robots.txt, a fetch as GPTBot, no-JS content, schema, answer shape — scored, with the fix. WAF & CDN DetectorWhich firewall or CDN guards a site? Cloudflare, Akamai, Fastly & more, from its headers. AI Crawler Access CheckerDoes your site let GPTBot, ClaudeBot & Perplexity in? Reads your live robots.txt and tells you, bot by bot. Website to MarkdownAny URL as clean, LLM-ready Markdown — fetched like a real browser, anti-bot walls included. PDF to MarkdownDrop a PDF, get structured Markdown — headings, GFM tables, lists and reading order rebuilt from the layout. robots.txt tester Test any list of URLs against Googlebot, GPTBot, ClaudeBot or PerplexityBot. Shows the exact rule that decided each verdict, with RFC 9309 precedence. robots.txt generator Build a valid file from presets, including one that keeps search crawlers while blocking AI training. Every choice explained in plain language. What is my user agent Your user agent string, what a server reads from it, and the Client Hints that are replacing it. cURL to code converter Paste a curl command, get Python, Node, Go or PHP. Headers, JSON bodies, auth and cookies carried over. Proxy tester Host, port and credentials in; curl with timings, Python, Node, PowerShell and a bash batch script out. Nothing leaves the browser.

Why these tools have no sign-up

The robots.txt tester and generator, the user agent page, the cURL converter and the proxy tester are JavaScript that runs on the page you are reading. There is no upload step and no account, because there is no server involved in the work: you can paste a robots.txt that is not published yet, or a curl command containing a live API key, without it leaving your machine. They keep working if our API is down, and we cannot rate-limit them.

The website and PDF converters, the WAF detector, the AI crawler checker and the AI visibility audit have to fetch something you do not have locally, so they call the same scraping API our customers use, through a residential IP with a real browser TLS identity. Those have a free daily quota per visitor, still no account, and the page you submit or the PDF you drop is processed and discarded, not stored.

What we build the rest of the time

QuanticData runs proxy networks and pay-per-success web data APIs — the infrastructure these tools describe from the outside. If a tool here answers your question, use it and go. If the answer turns out to be “this needs to run across ten thousand pages”, that is the other half of what we do:

  • Web scraping API — any page as clean Markdown, HTML or structured JSON.
  • SERP API — Google, Bing and DuckDuckGo results as structured data.
  • Crawl & map — discover every URL a site exposes, then fetch them.
  • SEO audit API — crawlability and on-page checks at site scale.
  • MCP server — the same APIs exposed as tools an AI agent can call itself.

About these tools

Are these tools really free?
Yes, and there is no account. The browser-only tools cost us nothing per use. The five that fetch through our API have a free daily quota per visitor, shown on the page, so they stay free without becoming somebody's scraping backend.

Is anything I paste uploaded?
For the robots.txt tester and generator, the user agent page, the cURL converter and the proxy tester: no, parsing and generation happen on the page, and the Network tab shows no requests. The website and PDF converters, the WAF detector, the AI crawler checker and the visibility audit send the URL or the PDF to our API, process it and discard it.

Can I use them at work or in a commercial project?
Yes. Use the output however you like; no attribution is required, though a link is always welcome.

Do the tools work offline?
The five browser-only tools do: once a page has loaded, the logic is already there. The five that fetch a page or a robots.txt for you need the API, and so a connection.

Need the same thing across ten thousand pages?

That is what the APIs are for. Free key, $2 of usage credit every month, and you pay only for calls that return a usable result.

Get my free API key

Free key, $2 of usage credit every month, no credit card.