Base64 Encoder / Decoder

Convert text to and from Base64 encoding in real-time. Supports URL-safe Base64.

Text Input

Base64 Output

What is Base64?

Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It's commonly used to encode data in emails (MIME), embed images in HTML/CSS via data URIs, transmit binary data in JSON APIs, and store complex data in URLs. URL-safe Base64 replaces + with - and / with _ to make it safe for use in URLs.

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Decoding a Base64URL authentication token? Check out our JWT Decoder. For web addresses and query parameters, try our URL Encoder / Decoder.

❓ Frequently Asked Questions

Q. What is the difference between standard Base64 and Base64URL?

Base64URL replaces "+" and "/" with "-" and "_" and removes trailing "=" padding characters, making the encoded output safe to include in URLs, file names, and JWT payloads.

Q. Can this tool encode images and binary files to Data URIs?

Yes, you can upload binary files or images directly to generate base64-encoded Data URIs ready for embedding in HTML tags or CSS stylesheets.

Q. Is my text or file uploaded to any cloud server?

Never. All encoding and decoding operations utilize the browser's native FileReader, TextEncoder, and Uint8Array APIs.