Developer Tools

Base64 Encoder Decoder

Encode and decode Base64 text directly in browser.

Last validated: 2026-02-14

Base64 Encoder Decoder is for safely converting plain text or binary text blobs into Base64 and back. It is useful when testing APIs, email payloads, and data URIs where raw characters can break transport. Use encode mode to transform input into a portable Base64 string, and decode mode to inspect what an existing payload actually contains. This tool helps you verify round-trip correctness quickly without writing helper scripts.

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Input Pattern

Enter values in the left panel, keep units explicit, run the calculation, then copy or share the result. Invalid fields are highlighted immediately.

Base64 Input

Result

aGVsbG8gd29ybGQ=

How to use this tool

Choose Encode or Decode mode, then paste your input text into the form.
Run the tool and copy the result from the output box.
For validation, run the opposite mode on the output and confirm you get the original input back.

Worked Example

Auto-generated from the tool's current default or entered inputs.

Example Inputs

Mode: encode
Input text: hello world

Expected Outputs

Interpretation

Cross-check the result against one alternate input set to validate sensitivity.

Scenario Compare (A vs B)

Use this to compare two input sets and quantify change in key outputs.

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Base64 Encoder Decoder

Input Pattern

Base64 Input

Result

How to use this tool

Worked Example

Example Inputs

Expected Outputs

Interpretation

Scenario Compare (A vs B)

Scenario A

Scenario B

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