Meta tag generator
Built in your browser · nothing is uploaded
Generates the whole head block at once: title, description, canonical, Open Graph and Twitter card tags, with the card type chosen automatically based on whether there is an image.
How to use the meta tag generator
Writing these by hand is where inconsistencies creep in: an og:title that drifted from the page title, a twitter:card set to summary while a large image is supplied, a canonical missing entirely. Generating them together keeps them in step. Two notes worth having. The canonical must be an absolute URL and should be self-referential on a normal page; omitting it entirely is usually safer than getting it wrong, since a canonical pointing at the wrong page removes yours from the index. And a robots directive of index, follow is the default behaviour, so writing it out achieves nothing — the tag is only worth including when you want noindex or nofollow.
Questions
No. That is the default. The tag is only worth adding for noindex or nofollow.
On a normal page, yes. A wrong canonical is far worse than none; it removes your page from the index.
Because it depends on whether you have an image. Setting summary_large_image with no image produces a broken card.
Around 155 characters. Google rewrites it often anyway, but a good one improves click-through when it is used.
No. Google has ignored them since 2009 and they are not generated here.