Slug generator
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Turns a title into a URL slug: accents folded to plain letters, everything lowercased, and every run of non-alphanumeric characters replaced with a single hyphen.
How to use the slug generator
Folding accents rather than percent-encoding them is the right call for URLs even though modern browsers handle Unicode fine. An encoded URL is unreadable when copied into plain text, breaks when a system truncates it, and is easy to typo. "café" becomes "caf%C3%A9" in an email. Two conventions worth following: hyphens rather than underscores, because Google has been explicit that it treats a hyphen as a word separator and an underscore as a joiner, and keep slugs short. A slug is not a place to repeat the whole title, and once a URL is published, changing it costs you every link pointing at it.
Questions
Hyphens. Google treats a hyphen as a word separator and an underscore as a joiner, so "my_post" reads as one word.
They are folded to their base letters; "café" becomes "cafe" rather than being percent-encoded.
Short. Three to five words is plenty; a slug is not a place to repeat the whole title.
You can, but every existing link breaks unless you set up a redirect. Get it right before publishing.
Yes, they are kept as they are.