DarnlyFree SEO and sharing tools for vibecoders
When you share a link, the preview people see comes from tags that AI-built sites often get wrong or leave out. These tools check how your link looks on X, LinkedIn, WhatsApp and Slack, write the meta tags, make a 1200×630 share image, and preview a post before you publish it. They also cover the files that help search engines and AI assistants understand your site: a sitemap, schema markup and llms.txt. Add UTM links to see which posts bring visitors, and QR codes for anything printed.
- Open Graph checkerSee how your link looks on X, LinkedIn, WhatsApp and Slack, and what to fix.
- Meta tag generatorSEO, Open Graph and X tags with a Google preview and length checks.
- OG image generatorA 1200×630 share image for link previews, plus the tags to paste.
- Sitemap generatorA sitemap.xml and robots.txt for your site in seconds, plus the broken links we found.
- UTM link builderTag your links for X, LinkedIn, Reddit or Product Hunt and see which post sent your visitors. With a QR code.
- llms.txt generatorAn llms.txt for ChatGPT, Claude and Perplexity from your pages, plus which AI crawlers you let in.
- Schema markup generatorJSON-LD for your company, app, product, article, FAQ, event or shop, with a Google result preview.
- X and LinkedIn post previewSee where LinkedIn cuts your post with “…see more”, how X splits it into a thread, and how pictures crop.
- NewQR code generatorA QR code for any link, with your colors and logo. PNG or SVG, and a warning if it won’t scan.
Questions
Are these tools really free?
Yes. Every tool on darnly.dev is free, with no sign-in and nothing to install. They are made by Darnly, a free Chrome extension and Mac app that turns a bug you see on screen into context your AI coding agent can fix.
Why does my link show no picture when I share it?
The picture comes from an og:image tag in your page’s head. If it is missing, too small, or the URL is not absolute, apps show a plain link. The Open Graph checker tells you what is wrong, and the OG image generator makes a 1200×630 image with the tags to paste.
What is llms.txt?
A short Markdown file at the root of your site that tells AI assistants what your site is and which pages matter. It is a proposed convention, not a standard every assistant reads yet, but it is cheap to add. The llms.txt generator writes one for you.