CRLF (Windows)Newline separator (for the "encode each line separately" and "split lines into chunks" functions). Encode each line separately (useful for when you have multiple entries). Split lines into 76 character wide chunks (useful for MIME). Perform URL-safe encoding (uses Base64URL format).

Basically, Base64 is a collection of related encoding designs which represent the binary information in ASCII format by converting it into a base64 representation.

Encode text or binary to Base64 online using UTF-8, UTF-16, Hex, custom alphabets, Base64URL, MIME, UTF-7, and IMAP variants.

3 days ago - Base64 encoding works by taking every three bytes of input data and converting them into four ASCII characters. The input bytes are split into 6-bit groups, and each group is mapped to a character from a 64-character alphabet (A-Z, a-z, 0-9, +, /).

July 30, 2026 - Base64 is widely used for sending e-mail attachments, because SMTP – in its original form – was designed to transport 7-bit ASCII characters only. Encoding an attachment as Base64 before sending, and then decoding when received, assures older SMTP servers correctly transmit messages with ...

Padding. Base64 works in 3-byte blocks; = fills the last block when input length isn't a multiple of three. ... Inspect every encoded payload alongside the session that produced it — network, console and state in one replay.

Base64 is a group of similar binary-to-text encoding schemes that represent binary data in an ASCII string format by transforming it into a radix-64 representation. The term Base64 originates from a specific MIME content transfer encoding.

November 20, 2025 - Base64 uses 6-bit characters grouped into 24-bit sequences. For example, consider the sentence Hi\n, where the \n represents a newline. The first step in the encoding process is to obtain the binary representation of each ASCII character.

Encode text or files as standard Base64, or decode Base64 into text or a downloadable file. 🔧🛠

You can use this tool to decode Base64-encoded strings, or to convert Base64 text strings back to their original binary string. Just paste your data and copy the result.

October 17, 2023 - The core functions to base64 encode and decode in JavaScript are btoa() and atob().

... Encode bytes-like object s using the URL- and filesystem-safe alphabet, which substitutes - instead of + and _ instead of / in the standard Base64 alphabet, and return the encoded bytes.

Decode and encode URL-safe Base64URL — the variant used in JWTs, OAuth tokens, and URLs.

Encode data by calling the encode_base64() function. The first argument is the byte string to encode. The second argument is the line-ending sequence to use. It is optional and defaults to "\n". The returned encoded string is broken into lines of no more than 76 characters each and it will ...

February 17, 2025 - These 64 printable characters include 26 uppercase letters A — Z, 26 lowercase letters a — z, 10 digits 0–9, a total of 62 characters, plus two other characters + and /. Base64 is an index - based encoding, and each character corresponds ...

May 13, 2026 - The base64_encode filter encodes a string using the Base64 format.

April 25, 2026 - Under the hood, Base64 takes 3 bytes (24 bits) and rewrites them as 4 characters from a fixed 64-character alphabet (A–Z, a–z, 0–9, +, /). When the input length isn't a multiple of 3, the encoder adds one or two = characters at the end ...

Base64 is an encoding algorithm that converts any characters, binary data, and even images or sound files into a readable string, which can be saved or transported over the network without data loss.

With this tool, you can encode any text into Base64 format or decode an existing Base64 string back to its original form. Base64 works by converting data into ASCII characters, allowing it to be transferred safely and smoothly over the internet.