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Base64 Encoder & Decoder

Auto-detects encode vs decode. URL-safe toggle, image drag-and-drop with preview, and JSON/XML beautify — all in your browser.

✨ Paste anything to start…
✨ Auto-detects: JWT  •  Images  •  JSON / XML  •  URL-safe Base64  •  Plain text  —  🔒 100% browser-based
Sample data:
Ctrl + V global paste
Ctrl + ⇧ + C copy output
Ctrl + ⇧ + X clear all
Input
Output
✨
Decoded text, image preview,
or beautified JSON will appear here
Decoded image preview
⚠️ Potential missing padding detected — auto-fixing and retrying…
Header HEADER
Payload PAYLOAD
Signature SIGNATURE
Detected JSON in output
⚖️
Input Size
—
bytes
📦
Output Size
—
bytes
📊
Size Ratio
—
—
🔍
Detected Format
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What is Base64 Encoding?

Base64 is an encoding scheme that converts binary data into a set of 64 printable ASCII characters. It is widely used to safely transmit data over text-based protocols like HTTP, email (SMTP), and JSON APIs — where binary data such as images, files, or credentials could otherwise cause formatting issues.

How to Encode or Decode Base64 Online

To encode to Base64, paste your plain text or upload a file and click Encode — you'll get a Base64 string instantly. To decode Base64, paste your Base64 string and click Decode to get back the original text or binary data. This tool also supports URL-safe Base64 (replacing + and / with - and _) for use in URLs and JWT tokens.

Common Base64 Use Cases

Base64 encoding is used everywhere in modern development — embedding images directly in HTML or CSS as data URIs, encoding API credentials in HTTP Basic Authentication headers, storing binary blobs in JSON payloads, encoding JWT token payloads, and transmitting file attachments in email via MIME encoding. This free tool works entirely in your browser — no data is sent to any server.

Frequently Asked Questions

What is Base64 encoding?

Base64 is a binary-to-text encoding scheme that converts binary data into ASCII characters. It is commonly used to encode data in URLs, emails, and web APIs.

Is Base64 the same as encryption?

No. Base64 is encoding, not encryption. It is easily reversible and provides no security. Do not use it to secure sensitive data.

How do I decode a Base64 string?

Paste your Base64 string into the input above and select Decode. The tool will instantly convert it back to the original text or data.

Can I encode images to Base64?

Yes. Base64 encoding is commonly used to embed images directly in HTML or CSS without a separate file request.

Is this tool safe to use for private data?

Yes. All encoding and decoding happens in your browser. No data is sent to any server.

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