Overview
String Obfuscation Masking helps hide middle characters while keeping selected prefixes and suffixes visible, useful for phone numbers, tokens, order IDs, and log snippets.
Key Features
- Real-time masking with configurable keep-first and keep-last values.
- Optional whitespace preservation to keep line breaks and formatting intact.
- One-click copy for quick reuse in tickets, docs, and API examples.
- Local browser processing without uploading your input.
Processing Rules
- Only middle characters are replaced, while keep-first and keep-last ranges remain visible.
- With whitespace preservation enabled, spaces, newlines, and tabs are not replaced.
- If total keep length exceeds input length, the original string is returned unchanged.
Steps
- Paste the source string into the input area.
- Set keep-first and keep-last values (non-negative integers).
- Turn whitespace preservation on or off as needed.
- Copy the result for sharing, demos, or troubleshooting notes.
Use Cases
- Mask request or response fields during API debugging.
- Hide account identifiers, tokens, and order data in logs.
- Present safe sample text in reports, demos, and training docs.
FAQ
- What if I enter decimals or negative numbers? The tool auto-corrects input to non-negative integers.
- What if keep ranges exceed text length? The original string is returned unchanged.
- Does the tool upload data? No. All processing runs in your browser.