Somewhere right now, a website is asking you to create an account to use a tool that runs entirely in your browser. The server never needs to remember you. The task — compressing an image, converting a PDF, generating a color palette — doesn't require your identity. The email address request is optional from a technical standpoint. It's not optional from a business standpoint. Your email is a persistent identifier. It connects your activity across sessions, makes you reachable for marketing, and links your usage data to a real person. According to Have I Been Pwned , which tracks known data breaches, billions of email addresses have been exposed — not through any carelessness on your part, but because every service holding your data is a liability waiting to materialize. The less you hand out your email, the smaller your exposure. This is a practical guide to using free online tools without signup requirements — and to handling the cases where a signup actually is necessary.…