Replace Text Letters

Normalize strings using custom character rules. Execute case-sensitive matching and recursive replacement passes to ensure data integrity. Export clean results.

Input Text

Paste the text whose letters should be replaced.

Letter Substitution Rules

Enter one rule per line in the format "from=to". To insert a newline, use the string "\n".

Use Two Pass Mode

Run the substitution rules twice so newly replaced letters can be replaced again.

Case Sensitive Rules

Use separate rules for uppercase and lowercase letters.

Text with replaced letters:

Please configure parameters and execute the action.

About Replace Text Letters

Replace Text Letters applies custom substitution rules to letters in text. It can respect case exactly or adapt replacement case automatically, and it also supports a second replacement pass for chained transformations.

How It Works

Use the tool in three quick steps:

Paste the text - Add the text whose letters should change.
Enter letter rules - Write one substitution per line using the format "from=to".
Generate the output - Click Replace Letters to apply the substitutions.

Basic Examples

Replace letters with custom symbols

Input Text:
banana

Letter Substitution Rules:
a=*
n=!

Output:
b*!*!*

Use two-pass replacement

Input Text:
aba

Letter Substitution Rules:
a=b
b=c

Use Two Pass Mode:
checked

Output:
ccc

Replace letters with newlines

Input Text:
aba

Letter Substitution Rules:
a=\\n

Output:

b

Real-World Usage Scenarios

Normalizing Character Data - Legacy Integration - Standardize datasets for older database systems that do not support special characters or specific symbols. By mapping complex characters to base ASCII equivalents, you ensure compatibility with legacy infrastructure without losing readability.
Generating Clean URL Slugs - Prepare raw titles for web use by replacing non-standard letters, accents, and punctuation with web-friendly characters. This prevents encoding errors in browser address bars and improves SEO indexing.
Text Anonymization and Data Masking - Protect sensitive information by substituting identifying letters with neutral symbols (e.g., replacing 'a' with '*' or 'e' with 'x'). This is a fast way to sanitize text snippets before sharing them in public forums or documentation.
Chained Logic for Complex Mappings - Use Two-Pass Mode to handle multi-step transformations. For example, you can convert 'A' to 'B' and then, in the second pass, convert 'B' to 'C', allowing for procedural text logic that a single-pass tool cannot execute.

Frequently Asked Questions

How does Case Sensitive Rules impact the replacement?

When enabled, the tool treats 'A' and 'a' as distinct characters. If disabled, a rule like 'a=x' will automatically replace both 'a' and 'A' with 'x' (or 'X' if the tool detects a need for case preservation).

Can I replace letters with new lines?

Yes. By using the string "\n" in your rule (e.g., "a=\n"), the tool will insert a line break every time it encounters the letter 'a'.

What is the purpose of Two Pass Mode?

Standard replacement happens simultaneously across the text. Two Pass Mode runs your rules twice, meaning a letter that was just created by a first replacement rule can be targeted and changed again by a second rule.

How many rules can I add at once?

There is no strict limit. You can define a comprehensive character map by entering one rule per line in the substitution rules box.

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