Base64 Encoder / Decoder – Free Online Tool

Base64 encoding is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It takes groups of 3 bytes (24 bits) and splits them into 4 6-bit numbers, mapping each number to one of 64 printable characters (A-Z, a-z, 0-9, +, and /).

No, Base64 is not encryption. It provides zero confidentiality or security protection because anyone can decode a Base64 string instantly back to raw plain text. It is designed for safe data transmission, not security.

Base64 represents 3 bytes (24 bits) of data using 4 ASCII characters (32 bits). Because 4 characters are used to transmit what originally required 3 bytes, the resulting output string size increases by exactly 33.3%.

Standard Base64 uses '+' and '/' characters, which have special meanings in URLs (like spaces and path separators). URL-safe Base64 replaces '+' with '-' and '/' with '_', and omits trailing '=' padding characters to ensure safe embedding in URLs.

No, 100% of the encoding calculation happens locally in your web browser memory using client-side JavaScript. Your text, files, and payload data are never sent to external servers or recorded in server logs.

Convert your image file into a Base64 string and format it as a Data URI: `data:image/png;base64,YOUR_BASE64_STRING`. You can paste this directly into an HTML `<img>` `src` attribute or a CSS `background-image: url(...)` declaration.

The '=' character is used as padding at the end of a Base64 string when the input byte length is not divisible by 3. One '=' indicates 2 input bytes, and '==' indicates 1 input byte in the final group.

Yes, our encoder converts your text into UTF-8 byte streams before Base64 encoding. This ensures that non-ASCII scripts, special symbols, and emojis are accurately converted and decoded without symbol corruption.

Concatenate your username and password with a colon (`username:password`), Base64 encode the string, and pass it in the HTTP header as `Authorization: Basic YOUR_BASE64_STRING`.

Because processing occurs in your local browser memory, you can encode strings and files up to tens of megabytes depending on your device's available RAM without performance lag.

Yes, DevriQ offers a dedicated Base64 Decoder tool and instant bidirectional conversion modes to quickly switch between raw text and Base64 encoded format.

Yes, this tool is 100% free with no registration, no subscription caps, and no usage limits for personal, educational, or enterprise software development.