About Base64 Encoder
Base64 is a notation for encoding arbitrary byte data using a restricted set of symbols that can be conveniently used by humans and processed by computers. This operation encodes raw data into an ASCII Base64 string. e.g. hello becomes aGVsbG8=
Input: binary bytes (text input uses UTF-8; a file retains its original bytes). Output: text.
Format reference: To Base64 background and specification
Example
Use “Try example” to load this public sample and its settings, then run it.
Input
Hello, world!
Result
SGVsbG8sIHdvcmxkIQ==
Text and file encoding
Text input is encoded as UTF-8. Opening a file uses its original bytes. A line break or trailing space changes those bytes and therefore changes the Base64 output.
Where is Base64 useful?
Use Base64 when a text protocol needs to carry binary data. It increases size by roughly one third and provides no encryption. Choose the URL-safe alphabet only when the receiving system expects it.
Parameters
| Parameter | Default value | Input and choices |
|---|---|---|
| Alphabet | "A-Za-z0-9+/=" | Escape sequences such as \n, \r and \t are supported17 Available choices
|
Before interpreting the result
Choose a decoder for an encoded payload, an encoder for transport, or a converter for structured data. Hex and Base64 represent bytes; converting formats does not encrypt or authenticate them.
How to use this page
- Paste your input or open a local file.
- Adjust tool options if needed, then choose Run tool.
- Copy the result or download the original output bytes.
Inputs and results are not added to the public catalogue or saved in the URL. Processing happens in your browser; HTTP Request and DNS over HTTPS send the requests you explicitly run. Files up to 128 MiB can be opened; decompression and image tools may have smaller processing limits. Large results have a shortened preview. Text and HTML downloads use UTF-8; binary downloads preserve output bytes. Pasted text follows browser newline handling; open a file when exact input bytes matter.