Base64 Encoder/Decoder

Free Base64 encoder and decoder for text, files, and images. Convert images to data URIs. Preview decoded images. All client-side.

How It Works

1

Choose text or file mode

Use the Text tab for string encoding, or the File tab for binary files and images.

2

Encode or decode

Conversion happens live as you type. For files, drop or select a file to encode.

3

Copy or download

Copy the Base64 output. For decoded files, download the result or view image previews.

FAQ

Base64 encodes binary data as ASCII text using 64 characters (A-Z, a-z, 0-9, +, /). It's used to embed data in text formats like JSON, HTML, and email.
Base64 encoding increases size by ~33% because it represents 3 bytes of data using 4 ASCII characters. For encoding images specifically, use the dedicated Image to Base64 tool which outputs ready-to-use data URIs.
Yes. Text is encoded via TextEncoder (UTF-8) before Base64 encoding, so all Unicode characters are supported.

Built & Maintained by Varstatt

Varstatt is a one-person product studio run by Jurij Tokarski, product engineer since 2011. These tools are free and open — no signup, no catch.