Base64 Encoder/Decoder

Encode and decode Base64 strings instantly

Use Base64 Encoder/Decoder

Realistic samples

Load an auth header, JWT segment, or Unicode text case.

Input Length
22 chars
Output Length
32 chars
Size Change
+45.5%
Variant
Standard
Status
Success

Output details

Copy-ready workflow handoff

Encode or decode Base64 text and copy the result with mode and validation notes.

Common searches
Base64 decoderBase64 encoder decoderdecode Base64
Invalid or edge case

Invalid characters, missing padding, or binary data can change the decoded result.

Local processing note

Base64 is not encryption; decoded text can reveal credentials or private payloads.

Base64 transform handoff

Copy this after replacing the bracketed output with the live result from the tool.

Base64 transform handoff: [paste the current tool output here].
Workflow: Encode or decode Base64 text and copy the result with mode and validation notes.
Sample to test: Decode a config value, API token fragment, data URI payload, or test fixture string.
Output to review: Copy the encoded or decoded text and note whether Base64URL or padding mattered.
Invalid/error check: Invalid characters, missing padding, or binary data can change the decoded result.
Privacy note: Base64 is not encryption; decoded text can reveal credentials or private payloads.
Next check: Use URL Encoder when the Base64 result is placed inside a query string.

Assumptions

Use Base64 Encoder/Decoder for encoding and auth debugging work when you need a local browser check and output you can review before using it in the next step.

browser-only decodeescape boundary checkcopy-safe output review

Worked example

When To Use Base64 Encoder/Decoder

  • Paste a real example into Base64 Encoder/Decoder that includes the edge case you need to check.
  • Review whether the output matches inspect transformed strings before they move into requests or templates before using it in the next step.

Sample Input And Output Checks

  • Start with a sample that includes the failure you are trying to reproduce, not only a clean placeholder.
  • Review padding, escaping boundaries, token segments, and copied delimiters before trusting the output.
  • Treat decoded or escaped output as readable input for the next step, not as automatically trusted data.

About This Tool

Use the Base64 encoder and decoder when text, credentials, tokens, small payloads, or data URI fragments need to move through systems that expect text-safe values. The page supports standard Base64 and URL-safe Base64 for everyday API, JWT, and query-string debugging.

How to Interpret Output

Base64 is an encoding, not encryption. Decoded output may reveal usernames, tokens, emails, file fragments, or JSON strings. If a value fails to decode, check for copied quotes, missing padding, a data URI prefix, or a full JWT where only one segment should be decoded.

Common Workflows

Decode Basic Authentication values, inspect Base64Url token segments, verify a round trip before adding a value to JSON, or compare the same bytes in hex. Use the JWT Decoder for complete tokens and the Image to Base64 tool for image file data URIs.

Next steps

Continue with the next check