What's the best way to start charging a client who expects free post delivery edits?

It’s easy to get trapped into doing free work when small client requests trickle in after a project is done. The real pain is trying to reset boundaries with someone who is already used to getting small tweaks for free.

If you've been in this spot how did you bring up billing for extra work without making it awkward?

Did batching requests work better for you or did you just start billing an hourly rate for every single small change?