Base64 Encode and Decode

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Base64 Encode/Decode is a tool that allow you to encode/decode strings to base64. It's wildly used by developpers since it allows to convert image into strings. The Base64 term originates from a specific MIME-content transfer encoding. This tool can be used on any device, including Android, Windows, Linux, and iOS through allinone.tools.

Text

Base64

Free Base64 Encode / Decode Online

Encoding and decoding Base64

Base64 represents arbitrary data using printable characters only, which allows it to travel over channels that accept text alone.

It is not encryption: anyone can turn a Base64 string back without a key.

How to use it

Paste text or a Base64 string and choose the direction — encode or decode.

When decoding, make sure the string is pasted in full; missing characters at the end make the conversion fail.

What it is useful for

Common with email attachments, in configuration files, and for embedding small files in text.

Never use Base64 to protect confidential information — that requires actual encryption.

Frequently asked questions

Is Base64 encryption?

No. It is a re-encoding that anyone can undo without a key.

Why does my input get larger?

Base64 represents three bytes with four characters, increasing the length by about a third.

Why does decoding fail?

Usually the string is incomplete or contains characters from the surrounding text. Paste only the data portion.