Add Errors to Text | Text Error Maker

Use this Text Error Maker to add random errors to your text. Easily corrupt your text online by replacing letters, numbers, or punctuation with selected error characters. Whether you need error-filled text for proofreading practice, testing, or AI training, this tool generates realistic text errors in seconds.

Or upload a text (.txt) file:

Text Error Options Error Characters: Error Rate (percentage): Add error to letters Add error to numbers Add error to punctuation & symbol Add error by category Keep Letter Case Ignore Custom Words

Text Error Maker Settings Guide

Add Error to Letters: Applies errors only to letters in the input text.

Add Error to Numbers: Applies errors only to numbers in the input text.

Add Error to Punctuation & Symbol: Applies errors only to punctuation marks and symbols.

Add Error by Category: Makes letter errors with random letters, number errors with numbers, and symbol errors with symbols.

Keep Letter Case: Preserves the original case when applying errors to letters.

Ignore Custom Words: Lets you specify words to exclude from error modification.

Example of Adding Error to Text

1. Add Errors to Letters in Text

Scenario: You want to add random errors to letters for proofreading practice or creating text with intentional typos using the text error maker tool.

Input:
Learning from misakes is an important part of growth. The teacher praised the students for their efforts.

Selected Options:
Error Characters: qwe
Error Rate: 30
Add Errors to Letters: checked
Keep Letter Case: checked

Output:
Weaqnqqg froe misqkqs es qn impweeant part oq growte. Ehe tewcher pqeised the stqqents fqr qheir ewfores.

2. Add Errors to Numbers in Text

Scenario: You want to corrupt only numeric data in your text using the add errors to numbers option for simulating corrupted text data during testing or validation checks.

Input:
Order IDs: 4587, 9834, 2765. Total sales reached $24999 this month.

Selected Options:
Error Characters: 019
Error Rate: 50
Add Errors to Numbers: checked

Output:
Order IDs: 9501, 1931, 0969. Total sales reached $24999 this month.

3. Add Errors to Punctuation in Text

Scenario: You want to insert punctuation or symbol errors for corrupting text format using the add errors to punctuation feature.

Input:
Hello! How are you? I'm fine, thank you. Let's meet at 5:00 p.m.

Selected Options:
Error Characters: #@$%!
Error Rate: 45
Add Errors to Punctuation: checked

Output:
Hello@ How are you? I'm fine$ thank you# Let's meet at 5:00 p!m.

4. Add Errors by Category

Scenario: You want to generate corrupted text where letters, numbers, and symbols are replaced within their own category using the add errors by category feature for more natural-looking text noise.

Input:
Flight AB123 departs at 10:30 a.m. from Gate C5, Terminal 2.

Selected Options:
Error Characters: zXY89!@#
Error Rate: 50
Add Errors by Category: checked
Add Errors to Letters: checked
Add Errors to Numbers: checked
Add Errors to Punctuation: checked

Output:
Fxyzxz XY993 dzpxrzs xx 10:99 a.x! fzom Xayx C5, Txryinax 2.

5. Ignore Specific Words While Making Error to Text

Scenario: You want to add random errors but avoid modifying certain keywords using the words to ignore feature.

Input:
Captain Rogers leads the mission successfully despite the risks involved.

Selected Options:
Error Characters: abc
Error Rate: 15
Add Errors to Letters: checked
Keep Letter Case: checked
Words to Ignore: captain

Output:
Captain Rogebs lbads the massian buccessbully despite tae risks involved.