Encoding & Decoding

Base64 Encoder / Decoder

The Base64 tool encodes any plain text string to Base64, or decodes a Base64 string back to plain text.

Encoding a String

1. Open SecureStack and go to the Tools tab
2. Select Base64 Encoder/Decoder
3. Type or paste your plain text into the input field
4. Click Encode — the Base64 output appears below
5. Click Copy to copy the result

Decoding a Base64 String

1. Paste your Base64 string into the input field
2. Click Decode — the decoded plain text appears below
3. Click Copy to copy the result

Common Use Cases

• Decoding Base64-encoded API tokens or credentials
• Encoding strings for use in HTTP Basic Auth headers
• Inspecting Base64-encoded data in logs or configuration files

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JWT Decoder

The JWT Decoder splits a JSON Web Token into its three parts and decodes each one so you can inspect the claims without leaving your workflow.

Using the JWT Decoder

1. Open SecureStack and go to the Tools tab
2. Select JWT Decoder
3. Paste your JWT token into the input field
4. The decoded output shows three sections:

Section	Contents
Header	Algorithm (alg) and token type (typ)
Payload	Claims — expiry, issuer, subject, custom fields
Signature	The raw signature component

5. Click Copy on any section to copy that part to your clipboard

Common Use Cases

• Inspecting access tokens returned by OAuth flows
• Debugging authentication issues in API requests
• Verifying token expiry (exp) and issuer (iss) claims

Note on Verification

The JWT Decoder decodes tokens for inspection only — it does not verify the signature cryptographically. Use a dedicated library or your auth server to validate token integrity.