Base64 Decoder / Encoder
Decode or encode Base64 strings and files instantly
Input (Text to Decode)
Output
Input Size
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Output Size
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Ratio
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Valid Base64
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What is Base64?
Base64 is a binary-to-text encoding scheme that converts binary data into ASCII string format. It uses 64 printable characters (A-Z, a-z, 0-9, +, /) making it safe for transmission over text-based systems like email and HTTP.
Common Uses
Encoding images in data URIs, transmitting files over email, embedding assets in HTML/CSS, API authentication tokens, and storing binary data in JSON/XML formats.
URL-Safe Variant
Standard Base64 uses + and / characters. URL-safe Base64 replaces these with - and _ to avoid conflicts with URL syntax and special character handling.
MIME Standard
The MIME standard (RFC 2045) recommends wrapping encoded data at 76 characters per line. Enable "Line breaks" to follow this standard for email compatibility.