Base64 Encode / Decode

About this calculator

This tool encodes plain text into Base64, a scheme that represents binary data using only 64 printable ASCII characters (A–Z, a–z, 0–9, + and /), or decodes a Base64 string back into its original readable text. Base64 does not compress or encrypt data — it purely re-encodes it into a format guaranteed to survive systems that only handle text safely.

It is used throughout web development and networking wherever binary-safe data needs to travel through text-only channels: embedding small images directly inside CSS or HTML, encoding attachments in emails, packing authentication tokens and credentials into HTTP headers and URLs, and storing binary blobs inside JSON or XML payloads. Developers reach for a quick Base64 encoder or decoder constantly when debugging API requests, inspecting JWT tokens, or preparing data for an interface that can only accept plain text.