We do not store your data. All processing happens in your browser.

Static + Browser-Only

Base64 Decoder and Masker Online

Paste Base64-encoded text and decode it in your browser, then mask sensitive values before sharing the result with AI tools, tickets, chats, or documentation.

All processing happens locally in your browser. No server processing required.

Input

Raw Base64 text

Tip: paste text or drag and drop a file here.

Paste or drag and drop a file, then run the tool.

Output

Decoded and masked text

Masked payload will appear here

Use Cases

Why use a Base64 decoder and masker?

Use this tool when plain text logs, support notes, console output, or mixed message blocks need to be shared without exposing raw personal information first.

  • Mask emails, IP addresses, MAC addresses, tokens, and sensitive text values
  • Redact common PII patterns in plain text and log snippets
  • Keep masking local to the browser instead of sending logs to a backend
  • Useful for support, debugging, incident review, and AI prompt preparation

Masking Logic

How this Base64 masking tool decodes and redacts text

Mask Payload checks common sensitive field names when they appear in text, then applies pattern-based masking for emails, phone numbers, IP addresses, MAC addresses, and similar values embedded in plain text.

  • Key-aware masking for log lines like token=... or password: ...
  • Pattern-based masking for plain text emails, IPs, phones, and MAC addresses
  • Readable output with copy/download options for clean handoff

Privacy Detail

Does this Base64 decoder upload data?

This tool runs as a static browser page. It processes plain text in client-side JavaScript in the current tab. No form submission, fetch request, XMLHttpRequest, or masking API call is used during the masking flow.

  • No form submission is used for the masking flow.
  • No fetch, XMLHttpRequest, or API call runs during masking.
  • The page uses local JavaScript parsing and regular expressions in the current tab.
  • The text is only written back to the output field unless you copy or download it yourself.
  • The masking flow does not store the payload in browser local storage.

FAQ

Who should use a Base64 decoder and masker?

Does this tool upload text anywhere?

No. The masking runs entirely in the browser on the current page.

Can I add custom masking fields?

Yes. Add custom field names such as traceToken, sessionCookie, or deviceId and mask again.

Who is this tool for?

Mask Payload is for engineers, support teams, SRE teams, analysts, and anyone who needs to share logs more safely.

Why Base64 cleanup matters before sharing

Sensitive values are often hidden inside Base64-encoded headers, test strings, or debug artifacts. Teams may decode them for troubleshooting, then need a safe way to share the decoded content.

A plain text anonymizer helps teams clean up logs before they are shared with vendors, AI tools, ticketing systems, or incident review docs, reducing avoidable privacy and security mistakes.

Examples

Example input and output

These short examples show the kind of input this page is built for and the kind of cleaned result you can expect before sharing data externally.

Example Input Sample data before masking or extraction 
eyJlbWFpbCI6ImpvaG4uZG9lQGV4YW1wbGUuY29tIiwicGhvbmUiOiI0MTYtMTIzLTQ1NjcifQ==
Example Output Sanitized or extracted result 
{
  "email": "****",
  "phone": "****"
}

Tool Directory

Browse masking tools by category

Find related browser-only masking tools for structured payloads, requests, tokens, config files, logs, infrastructure secrets, web payloads, security review, and practical guides.