How do you thank a coworker professionally?

Name what they did and its effect in one or two sentences, for example: "Thanks for reviewing the deck. Your edits made the pricing slide much clearer."

Should I thank my boss by email or in person?

Either works. A short email has the advantage that they can keep it, and it can help at review time.

Thank you message for coworkers

A thank you message to a coworker lands best when it names exactly what they did and the difference it made. One specific sentence beats a paragraph of general praise. Below are examples for coworkers, your boss, your team and mentors, plus short versions for Slack or Teams.

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For help on a project

Hi [Name], thank you for jumping in on [project] last week. Your [specific help] saved us at least a day, and the client noticed. I really appreciate it.
I wanted to say thanks for staying late to get [task] over the line. It made a real difference, and I owe you one.

To your boss

Hi [Name], Thank you for backing me on [situation]. Knowing you trusted my call made it much easier to push through, and I learned a lot from how you handled it. Best, [Name]
Thanks for the feedback on my presentation. The point about [detail] changed how I'll approach the next one.

To your team after a launch

Team, thank you. We shipped [project] on time despite [challenge], and that only happened because each of you went beyond your role. Drinks are on me on Friday.

To a mentor

Hi [Name], I don't think I've ever properly thanked you for the time you've spent helping me with [skill or decision]. Your advice on [specific thing] is something I come back to all the time. Thank you. [Name]

Short versions for Slack or Teams

Thanks for the quick turnaround on this, really appreciate it.
You saved me today. Thank you!
Huge thanks for covering for me while I was out.
Thanks for flagging that, good catch.

For a gift or a card

Thank you all for the lovely card and gift. It meant a lot, and it's already on my desk.
Thank you for the flowers and kind words. I'm lucky to work with such thoughtful people.

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did you do the thing i asked about yet??

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Frequently asked questions

How do you thank a coworker professionally?: Name what they did and its effect in one or two sentences, for example: "Thanks for reviewing the deck. Your edits made the pricing slide much clearer."
Should I thank my boss by email or in person?: Either works. A short email has the advantage that they can keep it, and it can help at review time.