What is Base64 encoding and why is it used?

Base64 is a binary-to-text encoding scheme that converts binary data into a string of ASCII characters. It is widely used to encode data in email attachments (MIME), embed images in HTML/CSS as data URIs, store binary data in JSON, and transmit data safely over text-based protocols like HTTP.

What is the difference between Base64 encoding and encryption?

Base64 encoding is NOT encryption — it is just a reversible encoding format. Anyone with the Base64 string can instantly decode it to the original content. Do not use Base64 to protect sensitive data. Use proper encryption (AES, RSA) for security purposes.

Can I use this tool to encode images to Base64?

This tool encodes and decodes text strings. To encode an image file to Base64, you would first need to convert the image binary data to a text representation. For embedding images directly in HTML or CSS, use data URIs in the format: data:image/png;base64,[encoded string].

Does Base64 encoding increase data size?

Yes. Base64 encoding increases data size by approximately 33% compared to the original binary data. This is because every 3 bytes of binary data are encoded into 4 ASCII characters. Consider this overhead when deciding whether to Base64-encode large data.

Base64 | TextDiffy — Free Text Tools Online

Base64 Encoder & Decoder Online

Base64 is a binary-to-text encoding scheme that represents binary data using a set of 64 ASCII characters (A-Z, a-z, 0-9, +, /). It is widely used in web development, cryptography, email encoding, and data transmission protocols.

Common Use Cases

Email attachments: MIME encoding uses Base64 to encode binary files like images and PDFs for email transmission.
Data URIs: Embed images directly in HTML/CSS using Base64-encoded data URLs (e.g., data:image/png;base64,...).
JWT tokens: JSON Web Tokens use Base64URL encoding for their header and payload sections.
API authentication: Basic HTTP authentication encodes "username:password" in Base64 for the Authorization header.
Configuration files: Some applications store configuration values in Base64 to avoid special character issues.
URL encoding: Encode binary data for safe transmission in URL query parameters.

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Base64 Encoder & Decoder Online

Common Use Cases