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…lowercase, should normally be uppercase.
Technically, IBANs (International Bank Account Numbers) are case-insensitive, meaning they can be written in lowercase or uppercase without affecting their validity.
However, the official format uses uppercase letters, and most systems expect IBANs in uppercase for consistency, readability, and to avoid confusion (especially with similar-looking characters like l and 1, or o and 0).
So:
option1: ✅ DE44500105175407324931 (preferred)
option2: ✅ de44500105175407324931 (still valid, but not standard)
option3: ❌ De44500105175407324931 (mixed case is unusual and may be rejected by some systems)
We use option 1.
bodiam
changed the title
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4 participants
IBANs, while technically capable of being lowercase, should normally be uppercase.
Technically, IBANs (International Bank Account Numbers) are case-insensitive, meaning they can be written in lowercase or uppercase without affecting their validity. However, the official format uses uppercase letters, and most systems expect IBANs in uppercase for consistency, readability, and to avoid confusion (especially with similar-looking characters like l and 1, or o and 0).
So:
option1: ✅ DE44500105175407324931 (preferred)
option2: ✅ de44500105175407324931 (still valid, but not standard)
option3: ❌ De44500105175407324931 (mixed case is unusual and may be rejected by some systems)
We use option 1.
Motivation for change: https://youtu.be/S6Z7vB5zc0g?t=813