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The option to add a signature on a check is currently unavailable in QuickBooks Online (QBO). As a workaround, you can add a signature on pre-printed checks.
For best compatibility, you can order a pre-printed check by clicking on the Gear icon and selecting Order Checks.
I've added an article about setting up alignment for printing checks: Align how your checks print. This helps provide some tips on how to align the print.
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