Base64 Encoder / Decoder
The Base64 Encoder and Decoder lets you convert text to Base64 and decode Base64-encoded strings directly in your browser. It's useful for web development, API testing, debugging, and understanding encoded data. Quickly switch between readable text and its Base64 representation without installing additional software. Use this free online Base64 tool to encode or decode your input whenever you need it.
Encode a short text sample with Base64. Load the example to see the tool in action.
What is Base64 Encoder / Decoder?
A Base64 Encoder and Decoder converts text to Base64 representation and decodes Base64 strings back into readable data. Use this free online Base64 tool to inspect encoded values in API requests, data URLs, application payloads, and development workflows without installing additional software.
Why use this tool?
- Quickly inspect encoded text without installing a command-line utility.
- Convert small text values used in APIs and development examples.
- Understand how encoded values appear in web and application data.
How to use Base64 Encoder / Decoder
- Step 1. Choose whether to encode or decode.
- Step 2. Enter the text or Base64 value.
- Step 3. Review the result and copy it into your development workflow.
Common use cases
Encode and decode Base64 in a browser
These functions are suitable for ASCII strings. Use TextEncoder/TextDecoder for UTF-8-safe handling of arbitrary Unicode text.
const encoded = btoa("hello");
const decoded = atob(encoded);
console.log(encoded, decoded); // aGVsbG8= helloTools to use next
Continue the task with related utilities for the next step in your workflow.
Important notes
- Base64 is an encoding scheme, not encryption.
- Base64 increases the size of data and should not be treated as a security boundary.
- Do not paste secrets into a tool unless you understand how that tool processes input.
More Encoding & Conversion Tools
Base64 Encoder / Decoder FAQ
Is Base64 encryption?
No. Base64 is reversible encoding and does not provide confidentiality.
Why does Base64 contain letters, numbers, plus and slash characters?
The standard Base64 alphabet represents binary data with 64 printable symbols, plus padding when required.