Developer Tools

Base64 Encoder/Decoder – Encode & Decode Base64 Strings Online | OnlineUtilityTools

Easily encode or decode Base64 strings with our online Base64 converter tool.

Base64 Encoder – Encode Data Online

Base64 encoding converts any text, binary data, or special characters into a safe, standardized text format. Developers use Base64 to transmit data through text-only channels like email and APIs, to embed images in HTML, and to encode authentication credentials. Online Base64 converters eliminate the need to install command-line tools or write custom scripts—just paste your data and get instant results.

When Should You Use This Tool?

API Requests:Encode authentication tokens and sensitive data for secure transmission in HTTP headers and request bodies.
Email Headers:Format attachments and binary content for MIME-encoded email messages.
Data URIs:Embed images directly in HTML and CSS by converting image files to Base64 data URIs.
JWT Tokens:Encode payload data in JSON Web Tokens for authentication and secure data transfer.

Example of How This Tool Works

Input (Plain Text):

Hello, World!

↓ Encode ↓

Output (Base64):

SGVsbG8sIFdvcmxkIQ==

The tool converts readable text into Base64 format, making it safe to transmit through text-only systems. You can decode it back to original text anytime.

Encode/Decode Base64

Text to Encode

How This Tool Works

Choose Mode

Select encode to convert text to Base64, or decode to convert Base64 back to text.

Enter Data

Paste your text or Base64 string into the input field.

Convert & Copy

Click the convert button and copy the result to your clipboard.

Frequently Asked Questions

This Base64 encoder is completely free and works instantly in your browser. Your data never leaves your device—it's processed locally and not stored anywhere. Use it as often as you need for encoding, decoding, and converting data formats.

Learn more about other developer tools and encoding utilities available on OnlineUtilityTools.

Privacy and Data Safety

All Base64 encoding and decoding happens entirely in your browser using JavaScript. Your text is never sent to our servers and is not stored anywhere. We do not collect, log, or transmit any data you enter into this tool. You can use it completely confidently for sensitive information, API keys, and authentication tokens.

Base64 Encoding Explained

Base64 encoding converts binary data into a text format safe for transmission across networks and systems that only support ASCII text. This is critical for email attachments, API data transmission, embedding images in HTML, and authentication tokens. Our Base64 encoder/decoder tool instantly converts between text and Base64 format, essential for developers working with APIs, databases, and web applications.

Common Base64 uses: Email systems use Base64 for binary attachments, APIs transmit encoded data safely, HTML/CSS embeds images as data URIs, authentication systems use Base64 for tokens, and databases store binary data as encoded text. Understanding Base64 is fundamental for web development and API integration.

Instantly encode text to Base64 or decode Base64 back to text. Our tool handles special characters and Unicode properly, perfect for developers, system administrators, and anyone working with encoded data. Fast, accurate, and completely free.