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This question already has an answer here:

What is correct?

  • He was logging on to the Bitrack database.

  • He was logging in to the Bitrack database.

  • Please note a password is required to log on/in to the database.

marked as duplicate by Hellion, Edwin Ashworth, Mari-Lou A, Drew, Julie Carter Sep 2 '15 at 22:16

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You generally log in (when entering usernames and passwords.) Log on can be used just to mean to visit a website, but that's not so common. I don't think you ever log on when you're entering a password unless you're confusing the two terms (which I'm sure happens a lot.)

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Microsoft Manual of Style page 329 states

Use log on or log on to to refer to creating a user session on a computer or network. Use log off or log off from to refer to ending a user session on a computer or a network Use sign in and sign out to refer to creating and ending a user session on the Internet.

Do not use log in, login, log onto, log off, logout, sign off, or sign on unless these terms appear in the user interface.

All that said, 'on' implies a platform, such as a particular machine or service while 'in' implies being surrounded, such as by data.

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    That's just Microsoft's opinion. – Hot Licks Sep 2 '15 at 16:52

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