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

Encode text to Base64 or decode Base64 strings back to plain text. Free, instant, private.

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Frequently asked questions

Base64 Encode & Decode Online — Free Base64 Converter

Base64 encoding converts text or binary data into a safe ASCII string format. It's used everywhere in web development — embedding images in CSS, passing data in JWTs, encoding email attachments, and storing binary data in JSON. Our tool encodes or decodes any text instantly in your browser.

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.