Base64 Diff & Compare
Paste two Base64 strings to see highlighted line-by-line differences, a change summary, and a similarity percentage. Everything is processed on your device.
Everything runs in your browser. Your data is never sent to our servers.
Example
Example Input
two Base64 strings
Example Output
decoded text differences
How to Use
- 1Paste the first Base64 strings (A) in the left box and the second (B) in the right box.
- 2Adjust the options if needed (ignore case, whitespace, or empty lines).
- 3Click Compare (or press Ctrl+Enter).
- 4See the highlighted differences, a summary of how many changes there are, and the similarity percentage. Switch between side-by-side / unified / inline views.
About Base64 Diff & Compare
Base64 Diff & Compare decodes two Base64 strings to their original text and compares the results. This finds differences in the decoded data, which are often invisible when comparing raw Base64 strings.
Supports both standard and URL-safe Base64. All decoding happens in your browser.
FAQ
What is the difference between "diff" and "compare"?
Both are done by the same tool. "Diff" highlights the lines/parts that changed (added/removed), while "compare" shows how similar the two inputs are (similarity percentage + summary). You get both at once here.
Is my data sent to a server?
No. The entire comparison is computed in your browser with JavaScript. Nothing is uploaded, logged, or stored on our servers — safe for sensitive data.