Base64 Inspector

Paste standard or URL-safe Base64 to inspect its structural properties without treating it as text.

Base64 or Base64URL

—Variant

—Encoded chars

—Decoded bytes

—Encoded overhead

ReadyBase64 commonly expands binary data because every output character represents 6 bits. Whitespace is excluded from the encoded-character count here.

How to use this Base64 Inspector

Inspect Base64 variant, padding, encoded length, decoded bytes, and size overhead. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.