Free I or L Character Checker
In many fonts, capital I, lowercase l, and the digit 1 look almost identical. This checker locates every instance of each character in your text and shows you exactly what's there — character by character. Essential for cleaning up usernames, passwords, OCR text, and serial numbers. For full character analysis, pair this with our Character Counter or Unique Character Counter.
Character-by-character
How the I or L Checker Works
The checker scans every character in your text. For each I, l, or 1 it finds, the character is highlighted in a different color so you can verify which one is actually there. Useful when you need to type a serial number, share a password securely, or audit OCR output.
Rules & Best Practices
1Capital I (uppercase letter)
Often a tall straight line with serifs in serif fonts; usually identical to lowercase l in sans-serif fonts.
2Lowercase l (letter L)
Looks like a tall line — almost identical to capital I in many fonts.
3Digit 1 (number one)
Usually has a small flag at the top in serif fonts; can be hard to distinguish in sans-serif.
4Tips for clarity
When writing usernames or passwords by hand, use a clearer font. When sharing serial numbers via text, type them in a monospaced font (Courier, Consolas) so each character is distinct.
Polish Your Writing
Combine grammar checks with our Character Counter and Word Counter for a full text analysis — counts, frequency, and structure.
📊Open Character Counter