Base64 Encoder & Decoder

Base64 is a binary-to-text encoding scheme that represents binary data in ASCII string format. It converts binary data into a set of 64 printable characters (A-Z, a-z, 0-9, +, /), making it safe to transmit through text-based protocols like email or embed in HTML/CSS. The encoded output is about 33% larger than the original data.

Base64 is commonly used for: embedding images directly in HTML/CSS (data URIs), encoding binary data for inclusion in JSON or XML, email attachments via MIME encoding, encoding authentication credentials in HTTP Basic Auth headers, and storing binary data in databases that only support text.

Standard Base64 uses + and / characters which have special meaning in URLs (+ becomes a space, / separates path segments). URL-safe Base64 replaces + with - and / with _, and typically removes the padding characters (=). This variant is commonly used in JWTs (JSON Web Tokens), URL parameters, and filenames.

No, Base64 is encoding, not encryption. It provides absolutely no security whatsoever. Anyone can decode a Base64 string instantly - it's a simple, reversible transformation. Never use Base64 to protect sensitive information like passwords or API keys. For security, use proper encryption algorithms like AES or secure hashing.

Yes, all Base64 processing happens entirely in your browser using JavaScript. Your data never leaves your computer and is never sent to any server. This makes the tool completely safe for any data you need to encode or decode, including sensitive information, API responses, and private content.