Base64 is an encoding scheme that converts binary data into a string of ASCII characters. It's commonly used to embed images in HTML/CSS, transmit data in JSON APIs, and store binary data in text-based formats.

Is Base64 encryption?

No. Base64 is encoding, not encryption. Anyone can decode it instantly. Don't use it to hide sensitive data — use proper encryption for that.

Why does Base64 output end with == sometimes?

Base64 pads the output with = characters to make the length a multiple of 4. It's normal and expected.

Can I encode binary files with this tool?

This tool handles text (UTF-8). For binary files like images, use the browser's FileReader API or a dedicated file converter.

Base64 Encode / Decode Online

Base64 encode / decode online — convert text to Base64 or decode Base64 back to plain text instantly. Free online Base64 converter, runs in your browser.

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Base64 Encode / Decode Online — Free Base64 Converter

Convert text to Base64 or decode Base64 back to plain text — entirely online and entirely in your browser. Base64 encoding turns binary or text data into a safe ASCII string used everywhere in web development: embedding images in CSS data URIs, passing data in JWTs, encoding email attachments, and storing binary fields in JSON. This online Base64 converter handles encode and decode in one tool with one-click switching.

Encode & decode

Switch between encoding and decoding with one click. Paste your input and get instant output.

100% private

Everything runs in your browser — your data is never sent to a server.

UTF-8 support

Handles Unicode, accented characters, and emoji correctly.

Whether you're working with JWTs, data URIs, email attachments, or API payloads — Base64 encoding and decoding is a fundamental developer utility. Free and instant.