Base64 Standard Detector
Paste a value and the detector analyses its alphabet, padding and line structure to tell you which Base64 variants it is compatible with, and which one is most likely.
| Standard | Compatible | Notes |
|---|
How detection works
The detector validates the value against each standard's alphabet (+/, -_, +,, .-, _:), padding rules and line structure (none, 64 or 76 characters per line, armor headers). A short value without special characters is often compatible with several standards at once; the most likely one is highlighted.
See all Base64 standards for details.
Frequently asked questions
How can I tell Base64 from Base64URL?
Base64URL uses "-" and "_" and usually has no "=" padding; standard Base64 uses "+" and "/". If a value contains none of these characters, it is valid in both.
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