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MICR line on a check
The MICR line is the machine-readable row at the bottom of a US check. It usually carries the routing number, account number and check number in a magnetic-ink style font so bank equipment can sort the item.
Why it matters for self-printing
If you print on blank stock, your software and printer must produce a MICR line your bank accepts. Some banks require MICR toner. Always confirm before you stop ordering pre-printed checks.
Safety
Full account numbers are sensitive. Do not enter them into a free sample tool. Checkgrove's free maker prints SAMPLE with no bank numbers. Paid MICR output is planned with ownership confirmation and an audit log.
Try a SAMPLE layout
Practice payee, amount in words, and print — no bank numbers, marked not negotiable.
Questions
Can I hand-write the MICR line?
No. Banks need a machine-readable MICR font and, often, magnetic ink.
Is MICR the same as the routing number on the check face?
The routing number also appears in MICR encoding at the bottom. The face may show it again for people to read.