Crypto

Base64 Encoder / Decoder

Encode and decode text to and from Base64. 100% client-side.

100% client-side — your data never leaves the browser.

How to use

  1. Enter a domain, URL, or value relevant to Base64 Encoder / Decoder.
  2. Run the check and review the output carefully.
  3. Apply recommended fixes, then run the check again to verify.

Common use cases

  • Pre-deployment validation for Base64 Encoder / Decoder.
  • Incident triage when security checks fail in production.
  • Periodic security review as part of technical SEO and hardening.

Common issues and fixes

Invalid Base64

Decode fails on non-Base64 chars. Check padding (multiple of 4).

Unicode in encode

btoa fails on non-ASCII. Use TextEncoder or encodeURIComponent first.

Recommended remediation

Base64 uses A-Za-z0-9+/. Padding with =. Use for binary in JSON, Basic auth, data URIs.

FAQ

Is Base64 Encoder / Decoder free to use?

Yes. This tool is free and can be used without account registration.

Do you store submitted values?

Only the minimum processing needed for the check. For client-side tools, data stays in your browser.

How should I use these results?

Use the output as a diagnostic baseline, apply fixes in your stack, then re-run the check to confirm remediation.

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