Replace Letters with Digits
Rewrite a string in leetspeak by swapping letters for look-alike digits. 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 Replace Letters with Digits
- 1. Paste your text. Enter the word or phrase you want to convert into the input pane, such as leet or a longer sentence you want partially obfuscated.
- 2. Set the replacement percentage. Move the Percent of eligible letters to replace slider to control how many look-alike letters get swapped, from a subtle sprinkle at low values to a full leetspeak rewrite near 100 percent.
- 3. Copy the leetspeak result. Copy the transformed string from the output pane into a stylized username, a gaming handle, or anywhere a leetspeak look is the point.
When to use Replace Letters with Digits
Replace Letters with Digits rewrites text in leetspeak by swapping eligible letters for look-alike digits, such as e for 3 and t for 7, with a slider controlling how aggressive the substitution is. It's for gaming handles, stylized usernames and playful text obfuscation.
- Creating a classic leetspeak username. You want a gaming handle in the recognizable 1337 style, converting leet into 1337 with a high replacement percentage for the full effect.
- Adding a light stylistic touch to a headline. A poster or social post wants just a hint of leetspeak flair without becoming unreadable. A low replacement percentage swaps only a few letters, keeping the phrase legible.
- Testing a profanity filter's leetspeak evasion handling. You're checking whether a content filter catches leetspeak variants of blocked words. Generating a partially substituted version shows what evasion attempts might look like.
- Building varied test strings for a fuzzy matcher. You want several versions of the same word with different amounts of letter-to-digit substitution to test how tolerant a matching algorithm is to that kind of variation.
Examples
Leetspeak
Input
leet
Output
1337
About the Replace Letters with Digits tool
Replace Letters with Digits does its work locally, right in the browser. Rewrite a string in leetspeak by swapping letters for look-alike digits. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the String Tools collection on EditSafely, a set of 159 small, focused String utilities that share the same instant, private workspace.
You can shape the output with the Percent of eligible letters to replace 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 Replace Letters with Digits 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.