Base64 Encode and Decode Guide

Use the Base64 Encoder / Decoder to convert text to Base64 or decode Base64 back to readable text.

What Base64 Does

Base64 represents binary or text data using a limited set of ASCII characters. It is common in tokens, data URLs, email attachments, and API payloads.

Encoding is not encryption. Anyone can decode Base64 if they have the string.

When to Decode

Decode Base64 when you need to inspect a payload, troubleshoot an integration, or verify that an encoded value contains the expected data.

Be careful with tokens and credentials. Decoding a token does not verify whether it is trusted.

Common Mistakes

Missing padding, URL-safe characters, copied whitespace, and mixed encodings can cause decode failures. Trim accidental spaces and confirm whether the source uses standard or URL-safe Base64.

FAQ

Is Base64 secure?

No. Base64 is an encoding format, not a security feature.

Why does my decode fail?

The string may be incomplete, use URL-safe Base64, include whitespace, or not be Base64 at all.

Can Base64 store images?

Yes, but large Base64 strings are often less efficient than normal file URLs.