Webmaster Tools

Diagnostics for people who run websites

Between launching a site and watching it perform well in search and social, there's a handful of technical checks that are easy to overlook — how a link previews when shared, whether a visitor's traffic is coming from where you expect, or what a page actually looks like on someone else's screen. Our Webmaster Tools cover exactly that gap, without needing a full analytics suite or developer console access.

Check how your site looks and shares

The Website Screenshot tool captures any public page exactly as a visitor would see it, on desktop or mobile, without you needing to open it yourself — useful for quick QA, portfolio captures, or seeing how a competitor's page renders. Before you share a link on social media, run it through the Open Graph Checker to confirm the title, description and preview image are pulling through correctly — a broken Open Graph tag is one of the more common reasons a shared link looks wrong or blank.

Look up visitors and domains

The IP Lookup resolves an IP address to its approximate location and network provider, handy for investigating suspicious traffic or verifying where a visitor is really connecting from. The User Agent Parser breaks a raw user agent string down into browser, OS and device details, which is useful when you're debugging a report that only includes a log line. For a broader read on any domain, the Domain Analyzer pulls together the technical signals worth knowing at a glance.

Branding and text utilities

Every site needs a favicon in half a dozen sizes for different browsers and devices — the Favicon Generator takes one source image and produces the full set in one pass. And when you need to update a string across a large block of text or code — a URL, a variable name, a piece of copy — the Find and Replace tool handles it faster than doing it by hand.

None of these require installing anything or connecting an account to your site — each one works from a URL, a string, or a single uploaded file.

Where these fit into running a site

Most of these checks are the kind you run reactively rather than on a schedule — something looks off, and you need an answer fast. A link you shared isn't previewing correctly, so you run the Open Graph Checker to see what tags are actually live. A support ticket mentions a strange device or browser, so you paste the user agent string in to decode exactly what they're using. Before a redesign goes live, a quick Website Screenshot confirms how the new version actually renders, not just how it looks in your own browser at your own screen size. And when traffic from an unfamiliar source shows up in your logs, the IP Lookup and Domain Analyzer help you work out whether it's worth investigating further.

A tip on favicons

Browsers and devices expect a favicon in several different sizes — a small one for browser tabs, a larger one for mobile home screen icons, and sizes in between for other contexts. Generating the full set at once with the Favicon Generator, rather than resizing a single icon manually, avoids the inconsistent, sometimes blurry favicons that show up when only one size was ever created.

Built for quick checks, not ongoing monitoring

It's worth being clear about what this page is and isn't. These are on-demand diagnostic tools — you run a check, get an answer, and act on it. They're not a monitoring service that watches your site continuously and alerts you when something changes; if you need that kind of always-on uptime or ranking tracking, that's a different category of product entirely. What these tools are genuinely good for is the moment you need a specific, one-off answer about a URL, a string, or a file, without signing up for a dashboard you'll only check occasionally.

Useful beyond your own site

Because every tool here works from a public URL, string or file, none of them require you to own or administer the site you're checking. That makes them just as useful for due diligence — checking a domain before a business deal, verifying a screenshot before trusting a claim about how a page looked at a point in time, or decoding a user agent from a security log that isn't even yours — as they are for maintaining a site you run day to day.

How it works

Key features

Benefits of using webmaster tools

Common use cases

• Confirming a shared link previews correctly before a campaign goes out.
• Capturing how a page renders on desktop and mobile without opening a device lab.
• Decoding a user agent string from a support ticket or server log.
• Generating a full favicon set from one source image before a site launch.

Best practices

• Re-check the Open Graph tags after any change to a page's title, description or image.
• Start the Favicon Generator with a large, square source image for the sharpest result.
• Use the Domain Analyzer as a first pass before deeper due diligence, not a replacement for it.

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