Base64 Encode

Encode text to Base64 format. Supports various character sets, URL-safe encoding, and MIME-compatible line chunking.

📁 Upload file Max 2 MB

Copy-paste your text here or upload a file

Please provide text to process.

Destination character set Change this if you want to convert the data to another character set before encoding.

Newline separator Prior to encoding, line breaks will be replaced with the selected separator.

Encode each line separately — Useful when you have multiple independent entries separated by line breaks.

Split lines into 76 character wide chunks — Useful for MIME (RFC 2045).

Perform URL-safe encoding — Uses Base64URL format (RFC 4648). Replaces + with - and / with _, and omits padding.

Base64 Encoding Explained

Why do I need Base64 encoding?

Base64 is an encoding scheme used to represent binary data in an ASCII format. This is useful when binary data needs to be sent over media designed to handle textual data. Concrete examples include sending images in an XML file or in an email attachment.

How does Base64 encoding work?

Bytes forming the data are broken into buffers of 24 bits (3 bytes at a time). The resulting buffer is then broken into 4 packs of 6 bits each. Those 6 bits form a number corresponding to the index in the Base64 character set (A–Z, a–z, 0–9, + and /). If the number of bytes is not a multiple of three, padding is added: == for 1 remaining byte and = for 2 remaining bytes.

How can I embed a Base64 encoded resource in HTML, XML, and CSS?

Listed below are examples of how to embed Base64 resources within different web documents.

HTML image embedding:
<img src="data:image/jpeg;base64,/9j/4AAQ..." />

XML image embedding:
<image>data:image/jpeg;base64,/9j/4AAQ...</image>

CSS image embedding:
.cls { background-image: url('data:image/jpeg;base64,/9j/4AAQ...'); }