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What Is Base64 Encoding?
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Base64 encodes binary data into a set of 64 printable ASCII characters (A-Z, a-z, 0-9, +, /). It's used wherever binary data needs to be transmitted over systems that only handle text — email attachments (MIME), data URLs in CSS/HTML, API authentication tokens (Basic Auth), and embedding images directly in code. Each 3 bytes of input becomes 4 Base64 characters.
Standard vs URL-Safe Base64
Standard Base64 uses + and / characters which have special meaning in URLs, causing encoding issues. URL-safe Base64 replaces + with - and / with _, making it safe to include in URLs and filenames without percent-encoding. Use URL-safe Base64 for JWT tokens, URL parameters, and filenames.
Use the Base64 Encoder Decoder above — enter your values and get instant results. This free online tool calculates how to encode to base64 without any download or signup required. Results update in real time as you type.
Use the Base64 Encoder Decoder above — enter your values and get instant results. This free online tool calculates base64 decoder free online without any download or signup required. Results update in real time as you type.
No — Base64 is encoding, not encryption. Anyone can decode Base64 instantly without a key. It only converts binary to text format. Never use Base64 to hide sensitive data — use proper encryption (AES, RSA) for security. Basic Auth headers use Base64 for username:password, which is why HTTPS is required for Basic Auth to be secure.