Add Random Letters to Words
Insert random letters into the words of your text. Runs entirely in your browser, so your data never leaves your device.
0 chars · 0 lines
Output
The result appears here as you type.
How to use Add Random Letters to Words
- 1. Paste the text you want to garble. Enter the words you want to inject extra letters into, such as clean sample text you're about to corrupt for a fuzz test.
- 2. Set Letters per word. Enter how many random letters should be inserted into each word. A small number produces subtle garbling, while a larger number makes words barely recognizable.
- 3. Review the garbled text. Check the output pane to see extra letters scattered inside each word at random positions, while word boundaries and spacing stay in place.
- 4. Copy the garbled result. Copy the noisy text into your fuzz-testing input file, spell-checker test suite, or wherever garbled words are useful.
When to use Add Random Letters to Words
Add Random Letters to Words inserts extra characters into the middle of every word, corrupting spelling without changing overall word count or sentence structure. Use it to fuzz-test spell checkers, generate noisy training data, or simulate the kind of garbling that happens during OCR or transmission errors.
- Fuzz-testing a spell-checker's correction suggestions. A spell-check feature needs to be tested against words with inserted extra letters, a different error pattern than deletions or swaps, to confirm it still suggests the right correction.
- Simulating OCR noise in scanned text. Optical character recognition sometimes inserts stray characters into words when scanning low-quality documents. Adding random letters to clean sample text approximates that kind of corruption for testing.
- Building garbled training data for a text-cleaning model. A model that's supposed to clean up noisy user input needs training examples with letters inserted at random, mimicking sloppy typing or transmission glitches.
- Creating a word-recognition challenge for a game. A puzzle game shows players words with extra letters stuffed in and asks them to identify the original word underneath the noise.
Examples
One extra letter per word
Input
hello world
Output
heallo wortld
About the Add Random Letters to Words tool
Add Random Letters to Words is a free online tool that works entirely inside your web browser. Insert random letters into the words of your text. Because the processing happens on your own device, nothing you enter is uploaded, logged or stored anywhere.
This page is one of 211 Text utilities on EditSafely. Each one does a single job well, and all of them follow the same rule: your input stays on your machine.
You can shape the output with the Letters per word 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.
Because nothing leaves your device, the tool is suitable for sensitive content such as internal documents, credentials or customer data. It also responds instantly, since every keystroke is handled on your own machine rather than by a remote API.
Frequently asked questions
Does Add Random Letters to Words cost anything?
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?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
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?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
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.