Replace Text Letters
Replace letters in text using custom substitution rules.
Input
Output
What It Does
Replace specific letters in your text with other characters or strings. Define which letters to find and what to replace them with, applying substitution throughout - useful for simple ciphers, text transformation, or character mapping.
Common Use Cases
- Creating simple substitution ciphers
- Mapping certain characters to others
- Text transformation and effects
- Replacing problematic characters
- Custom character substitution
How to Use
- Paste your text
- Specify which letter to replace and with what
- All occurrences are substituted
- Copy the transformed text
Features
- Replace any letters with any string
- Case-sensitive or insensitive option
- Multiple replacement rules possible
- Preserves non-matching characters
Examples
Below is a representative input and output so you can see the transformation clearly.
banana Replace: a -> o
bonono
Edge Cases
- Very large inputs may take a few seconds to process in the browser. If performance slows, split the input into smaller batches.
- Mixed formatting (tabs, line breaks, or inconsistent delimiters) can affect output. Normalize spacing first if needed.
- Replace Text Letters follows the selected options strictly. If the output looks unexpected, re-check option settings and input format.
Troubleshooting
- Output looks unchanged: confirm the input contains the pattern this tool modifies and that the correct options are selected.
- Unexpected characters: check for hidden whitespace or encoding issues in the input and try normalizing first.
- Slow processing: reduce input size or try a modern browser with more available memory.
Frequently Asked Questions
Is my input stored or logged?
No. This tool is designed to run in your browser, and we do not store or log your content during processing.
Is conversion instant?
Yes for most inputs. Output updates immediately, and large inputs may take a moment depending on your device.
Can this handle large text?
It can handle large text, but performance depends on your browser and device. For very large files, consider splitting the input.
Does it support mobile?
Yes. The interface is responsive and works on phones and tablets, so you can use it on the go.
Can I use it for commercial projects?
Yes. You are free to use the output in personal or commercial projects without attribution.
Does this affect numbers or punctuation?
Only if the selected options target them. Otherwise, numbers and punctuation are preserved as-is.