Base64 Encoder / Decoder

Quick start

How to use Base64 Encoder / Decoder

1. 1

   Choose your operation mode: select "Encode" to transform plain text into Base64 or "Decode" to convert Base64 back to text.

2. 2

   Paste or type your input string directly into the text area.

3. 3

   View the real-time converted result generated automatically below.

4. 4

   Click the "Copy" button to save the output directly to your clipboard.

Overview

About Base64 Encoder / Decoder

Base64 is a widely used binary-to-text encoding scheme that represents binary data in an ASCII string format. It works by converting groups of 3 bytes (24 bits) into 4 printable ASCII characters (6 bits each) from a set of 64 characters (A-Z, a-z, 0-9, +, and /). Because many legacy transport protocols—such as SMTP for emails or HTTP headers—were originally designed to handle only standard ASCII text, transmitting raw binary data like images, audio, or encrypted payloads directly can result in corruption or data loss. Base64 encoding ensures that data remains intact and unchanged during transit across systems and networks. Our Base64 Encoder and Decoder performs bidirectional text conversion in the browser. It is useful for inspecting encoded values, decoding Basic authentication payloads during debugging, and converting text for systems that expect Base64 data. Base64 is an encoding format, not encryption, so encoded values should never be treated as confidential simply because they are not immediately readable.

FAQ

Frequently asked questions

Is Base64 an encryption algorithm?

No, Base64 is strictly an encoding scheme, not encryption. It provides zero security or data confidentiality because anyone can easily decode a Base64 string back to its original plain text without a key or password.

Why does Base64 output sometimes end with equal signs (= or ==)?

The equal sign (=) is used as padding in Base64. Since Base64 processes data in 3-byte blocks, padding characters are appended at the end of the encoded string if the total number of input bytes is not divisible by 3.

Does Base64 encoding increase file size?

Yes, Base64 encoding increases the data size by approximately 33%. Every 3 bytes of raw binary data are converted into 4 characters of ASCII text.

Is my data safe when using this Base64 tool?

The encoder and decoder perform their conversion in your browser and do not require sending the input text to our server for processing. Avoid treating Base64 as a security mechanism because it provides no confidentiality.