Shorter row IDs?

I’m currently creating barcodes from the RowID, but the ID is so long the barcode becomes difficult to scan. I’m looking for a way to create unique codes that are no more than eight characters.

These codes will be used for user barcodes.

Any ideas?

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I personally use the first letters (function left()) in Google sheet and check if there is a match on sheet or sometime textjoin with significant data in the row.
The solution by @Jeff_Hager is great too.
Marco

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