See your page the way Google and AI do.
Technical SEO checks, JavaScript rendering and AI crawler access for the page you are on, in one Chrome side panel.
- No account
- Nothing leaves your browser
- Open source
JavaScript
- Google preview
- GPTBot
- OAI-SearchBot
- ChatGPT-User
- ClaudeBot
- Claude-SearchBot
- PerplexityBot
- Google-Extended
- Applebot-Extended
- Bytespider
- Meta-ExternalAgent
- CCBot
- robots.txt
- llms.txt
- rel=canonical
- Meta robots
- hreflang
- JSON-LD
- Open Graph
The page looks fine. Crawlers read something else.
Most SEO problems never show on screen, so nobody notices them until traffic drops.
Content that needs JavaScript
Your browser shows the full page. The HTML a crawler downloads can be an empty shell, and most AI crawlers never run the scripts that fill it.
Snippets cut off in Google
A long title or description ends in three dots. The line that was meant to win the click never shows.
AI crawlers blocked by accident
One old line in robots.txt can keep a site out of ChatGPT, Claude or Perplexity answers for months.
Preview your Google result before you publish.
Type a title and a description. See where Google cuts them on desktop and on mobile. It runs in this page and nothing is sent anywhere.
Limits are measured in pixels and are approximate. Google can rewrite titles and snippets.
Five tabs. One side panel.
A score and a checklist the moment the panel opens.
Title, description, canonical, robots, H1, alt text, structured data and Open Graph, each with a clear status.
The outline crawlers see, highlighted on the page.
The H1 to H6 tree with skipped levels and duplicate H1s, plus every image without alt text.
Broken and redirected links, found from the page itself.
Internal, external and nofollow links with anchor text. Internal links get a real status check from your browser.
Raw HTML next to the rendered page.
Serpline downloads the page source once and compares it with what JavaScript built: headings, words, links and structured data.
Which AI crawlers can read the site, and what they see.
Rules for GPTBot, ClaudeBot, PerplexityBot, Google-Extended and more from robots.txt, split into search bots and training bots, plus llms.txt.
Three steps, no setup.
Add Serpline to Chrome
Free from the Chrome Web Store. No account to create.
Open a page, click the icon
The side panel opens next to the page and checks it. Or press Alt+Shift+S.
Download the audit PDF
Every issue with its fix, ready to send to a developer.
Found problems? Get them fixed by the person who built Serpline.
One click turns the findings into a prioritized report. Send it to a developer, or send it to me: I fix technical SEO, server-side rendering, structured data and AI search visibility.
Your pages stay in your browser.
Is Serpline really free?
Yes. There is no paid plan, no account and no usage limit.
How is it different from Ahrefs or Screaming Frog?
Those crawl whole sites from a server or from your desktop. Serpline checks the page you are on, inside your browser, including what changes after JavaScript and what AI crawlers are allowed to read. It works well next to them.
How does it check AI search?
It reads robots.txt and llms.txt on the site, matches the rules for each known AI crawler and compares the raw HTML with the rendered page, because most AI crawlers don't run JavaScript.
Does it crawl my whole site?
No. It checks the open page, the site's robots.txt and llms.txt, and the status of internal links on that page.
Does it send my pages anywhere?
No. Requests go only to the site you are on, from your own browser. Nothing reaches me or anyone else.