Add Errors to a List
Add errors and corruption. Runs entirely in your browser, so your data never leaves your device.
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Output
The result appears here as you type.
How to use Add Errors to a List
- 1. Paste your list. Put one item per line into the input pane, such as clean words or sentences you want to intentionally corrupt with typos.
- 2. Set Errors to introduce. Choose roughly how many typos to scatter across the list, such as swapped letters or dropped characters. A higher number makes the corruption more obvious and widespread.
- 3. Copy the corrupted list. Copy the result, now sprinkled with realistic typos like 'aplpe' for 'apple', into a test case, mockup, or anywhere fat-finger errors need to be simulated.
When to use Add Errors to a List
Add Errors to a List introduces a chosen number of realistic typos into each item, simulating the kind of mistakes people make typing quickly. Use Add Errors to a List whenever you need imperfect, human-looking text rather than clean input for testing or demonstration.
- Generating test data for a spell checker. You are building or testing a spell-check feature and need realistic misspellings to feed it. Corrupt a clean wordlist with a controlled number of typos as test input.
- Stress-testing a fuzzy search feature. A search feature is supposed to tolerate typos, and you want sample queries with realistic mistakes to verify it. Add errors to a list of correct search terms.
- Making a mockup look like handwritten notes. A design mockup needs list text to look like it was typed quickly by a real person, typos included. Add a few errors to otherwise clean placeholder text.
- Creating a proofreading exercise. You are building a proofreading worksheet where students find and fix mistakes. Corrupt a clean list of sentences with a known number of errors as the exercise.
Examples
Introduce a few typos
Input
apple banana cherry
Output
aplpe banaana chery
About the Add Errors to a List tool
Add Errors to a List does its work locally, right in the browser. Add errors and corruption. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the List Tools collection on EditSafely, a set of 114 small, focused List utilities that share the same instant, private workspace.
You can shape the output with the Errors to introduce setting, and the result refreshes the moment you change it. A worked example further down the page shows exactly what the tool produces for a real input.
Running locally also makes the tool fast and dependable: results appear as you type or drop a file, there is no server outage that can take it down mid-task, and confidential data can be processed without a second thought.
Frequently asked questions
Is Add Errors to a List free to use?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.