Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 strings back to text.
How to Use Base64 Encoder & Decoder
- Enter or select the initial source value in base64 encoder & decoder.
- Choose your desired target unit or output format from the drop-down selection menu.
- View the instant converted output computed with precise mathematical conversion factors.
- Copy the converted value or formatted result to your clipboard with one click.
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Frequently Asked Questions
What is Base64 encoding and why is it used?
Base64 is a binary-to-text encoding scheme that translates arbitrary binary data or text octets into a set of 64 printable ASCII characters (A-Z, a-z, 0-9, '+', and '/'). It ensures that binary data can be safely transmitted across text-only communication channels like email (MIME), HTTP headers, and JSON API payloads without corruption.
Why does Base64 encoded text increase in size by approximately 33%?
Base64 encodes every 3 bytes (24 bits) of binary input into 4 ASCII characters (6 bits per character). Because 4 characters are transmitted for every 3 original bytes, the encoded data is mathematically 4/3 (~133%) of the original binary size, with up to two '=' padding characters added if the input length is not a multiple of 3.
How does EverySolve handle multi-byte UTF-8 characters and emojis?
Legacy JavaScript btoa() only supports 8-bit Latin-1 characters and throws an exception on Unicode or emojis. EverySolve uses the modern TextEncoder and TextDecoder Web APIs to encode text into standard UTF-8 octet streams before Base64 conversion, ensuring 100% round-trip accuracy for international scripts and emojis.
What is the difference between standard Base64 and Base64URL?
Standard Base64 uses '+' and '/' characters, which have reserved meanings in URL query parameters and file path segments. Base64URL (RFC 4648 Section 5) replaces '+' with '-' (minus) and '/' with '_' (underscore), and typically omits '=' padding, making it safe for URLs and JSON Web Tokens.
Does Base64 encoding encrypt or protect sensitive passwords?
No. Base64 is an encoding format, NOT encryption. It provides zero cryptographic security or confidentiality; anyone can reverse a Base64 string back to its original plain text in milliseconds. Never store passwords or private secrets in raw Base64 without AES or RSA encryption.