String Masking

Mask sensitive information with custom keep positions。 Runs locally—nothing uploaded.

Input Text

Keep First N

Keep Last N

Mask Char

Count, compare, search, replace, normalize, and transform text for writing and development tasks.

How to use & FAQ

String Masking: Mask sensitive information with custom keep positions. Text stays in your browser.

Works with regex, diff, and replace tools.

Signup required for String Masking?▾

No. Free with no account.

Uploaded?▾

No.

Unicode/Chinese?▾

UTF-8 supported.

Huge text?▾

May slow down; split large inputs.

Mobile browsers?▾

Yes; heavy tasks better on desktop Wi-Fi.

Copy or download?▾

Yes—copy text or download files as supported.