robots.txt Generator, Builder & Tester — with AI Crawler Control
Most robots.txt files break the moment you add a second User-agent group or paste in a path with the wrong slash. This robots.txt generator is a visual robots txt builder and robots txt creator that writes the syntax for you, then ships with a tester that simulates Googlebot, Bingbot, and the new wave of AI bots against any URL you give it. I built it after auditing dozens of sites where a single stray Disallow: / nuked the entire index. Use the editor above to assemble rules per User-agent, drop in a sitemap, and toggle Crawl-delay; the right pane writes a clean robots txt template you can copy or download. Need AI crawler control? Add GPTBot, ClaudeBot, CCBot, Google-Extended, or anthropic-ai groups in two clicks. Everything runs in your browser — nothing is sent to a server.
Why This Robots.txt Generator
I tested this crawler control file generator against the most common alternatives. Here is how they compare on the criteria that actually matter when you are shipping a production robots.txt.
| Capability | This tool | Smart Robots.txt Generator (Google) | SEOptimer Robots.txt Generator | Yoast plugin | Manual editing |
|---|---|---|---|---|---|
| Visual multi-group builder | Yes — unlimited User-agent groups | Limited — single group focus | Form-based, single block | Raw textarea only | No UI |
| AI crawler presets (GPTBot, CCBot, anthropic-ai) | Built-in dropdown | Manual entry | Manual entry | Manual entry | Manual entry |
| URL tester with bot simulation | 12 user agents, side-by-side | Googlebot only (in GSC) | No tester | No tester | No tester |
| Privacy — runs in browser | 100% client-side | Sends to Google | Server-side | On your server | Local |
| Cost & account | Free, no signup | Google account required | Email gate | WordPress only | Free |
For comparison, when you only need to validate, Google's official robots.txt report inside Search Console is excellent — but it cannot generate a file from scratch and it cannot simulate AI bots. This tool fills that gap.
What Is robots.txt and Why It Matters
The robots.txt file is a plain text file placed at the root of your website that tells search engine crawlers which pages or sections they can and cannot access. It follows the Robots Exclusion Protocol, a standard that has been in use since 1994.
Every time a crawler visits your site, it checks https://yoursite.com/robots.txt first. If the file exists, the crawler reads the rules and respects them before crawling any pages. However, robots.txt is a directive, not a security measure — well-behaved bots follow it, but malicious bots can ignore it entirely.
Proper robots.txt configuration is important for several reasons. First, it prevents crawlers from wasting your crawl budget on low-value pages like admin panels, search result pages, or duplicate content. Second, it keeps private staging areas and internal tools out of search indexes. Third, with the rise of AI crawlers like GPTBot and CCBot, robots.txt has become the primary mechanism for controlling AI training access to your content.
That said, robots.txt does not remove pages from Google's index. If Google already knows about a URL (through links, sitemaps, or prior crawling), blocking it in robots.txt prevents crawling but the URL may still appear in search results. To truly deindex a page, use the noindex meta tag instead. For more on how these directives interact, see our guide on crawl budget optimization. Once your robots.txt is solid, double-check international targeting with our hreflang auditor and validate your structured data with the schema validator.
Frequently Asked Questions
A robots.txt generator (also called a robots txt builder or robots txt creator) is a tool that produces a syntactically correct robots.txt file from a visual interface, so you do not have to memorize directive order, wildcards, or User-agent stanzas. This generator outputs a clean robots txt template you can paste at https://yoursite.com/robots.txt.
robots.txt is a plain text file placed at the root of a website (e.g., https://example.com/robots.txt) that instructs search engine crawlers which URLs they are allowed or not allowed to crawl. It follows the Robots Exclusion Protocol and is checked by crawlers before they access any page on your site.
No. Blocking a URL in robots.txt prevents crawling, but the URL can still appear in search results if Google discovers it through external links or sitemaps. The listing will show the URL without a snippet. To remove a page from search results entirely, use a noindex meta tag or X-Robots-Tag HTTP header instead.
Add a separate User-agent group for each AI crawler and disallow all paths. The most common AI bots to block are GPTBot (OpenAI training), ChatGPT-User (live ChatGPT browse), Google-Extended (Gemini training, separate from Googlebot), CCBot (Common Crawl, used by many LLMs), anthropic-ai and ClaudeBot (Anthropic). Example block:
User-agent: GPTBot
Disallow: /
User-agent: ClaudeBot
Disallow: /
User-agent: CCBot
Disallow: /
This tool's User-agent dropdown includes all of these for one-click AI crawler control — you do not need to remember the exact spelling.
Use robots.txt to control crawling — that is, whether a bot fetches the URL at all. Use noindex (a meta tag or HTTP header) to control indexing — whether the URL appears in search results. Critically, the two can conflict: if you block a URL in robots.txt, Google never sees the noindex tag, so the URL can still appear in results. For pages you want fully removed from search, allow crawling but add <meta name="robots" content="noindex"> to the page itself.
Switch to the Tester tab above, paste your robots.txt content, then enter a path (e.g., /admin/) and pick a User-agent. The tester returns Allowed or Blocked along with the matching rule. Test multiple paths and bots before pushing to production. Google Search Console also offers a robots.txt report under Settings, but it only tests live URLs and only with Googlebot variants.
Disallow tells crawlers not to access a URL path. Allow explicitly permits crawling of a path, which is useful for allowing a subdirectory inside a disallowed parent. When both match, the more specific rule wins. For example, Disallow: /private/ with Allow: /private/public-page blocks the entire /private/ directory except for /private/public-page.
Googlebot ignores Crawl-delay entirely. Bing, Yandex, and Baidu honor it. Set crawl rate for Googlebot in Search Console instead. For other bots, a value of 5–10 seconds is reasonable on small servers. Crawl-delay above 30 is usually counterproductive because it slows down legitimate indexing without solving load problems. If your server is genuinely overwhelmed, fix the bottleneck (CDN, cache) rather than throttling crawlers.
It depends on your content strategy. Block AI training bots (GPTBot, CCBot, Google-Extended, ClaudeBot) if you do not want your content used to train commercial LLMs without compensation. Allow them if you want your brand and expertise referenced inside ChatGPT, Gemini, or Claude answers — LLMs increasingly drive discovery, and being absent from training data may reduce future visibility. Many sites compromise: block CCBot (which feeds many models) but allow Google-Extended.
Yes, it is a best practice. Adding Sitemap: https://yoursite.com/sitemap.xml to your robots.txt helps crawlers discover your XML sitemap even if it is not submitted through Google Search Console or Bing Webmaster Tools. You can include multiple Sitemap directives.
Yes — this robots txt builder includes a WordPress preset (click Presets in the toolbar) that pre-fills the conventional WordPress rules: allow /wp-admin/admin-ajax.php, disallow /wp-admin/, disallow /?s= search URLs, and add the standard sitemap path. Copy the output and either paste it into Yoast's File Editor or upload a static robots.txt to your site root. Static files override plugin-generated ones.
Use the E-commerce preset. The typical pattern blocks faceted-navigation URLs (?color=, ?size=, ?sort=), cart and checkout endpoints (/cart/, /checkout/, /my-account/), and internal search (/?s= or /search?). Allow product and category pages. Always include the sitemap directive. Faceted URLs are the #1 crawl-budget drain on Shopify and WooCommerce sites — this crawler control file generator handles them with one preset click.
Yes, completely free with no limits. No registration required. Everything runs in your browser — your robots.txt content is never sent to any server. You can also use the tester tab to validate existing robots.txt files and test URL access rules.