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You do not need an account to use the optimiser — everything on this site works without one. Signing in does two things: your saved projects follow you to another device, and your details are filled in for you when you ask us to quote something.
No password. Type your email, we send you a link, you click it.
The link works once and expires in 20 minutes. If you did not ask for it,
the email does nothing on its own.