Base64 Encoder

The Base64 Encoder converts plain text, strings, and raw data into Base64-encoded output — a widely used encoding scheme that represents binary data using a set of 64 printable ASCII characters. Base64 is not encryption, but a reliable way to safely transmit data across systems that may not handle raw binary or special characters correctly.

For developers, Base64 encoding is an everyday necessity. Whether you're embedding images directly in HTML or CSS, passing data through JSON payloads, working with authentication tokens, or handling email attachments, Base64 ensures your data survives transport without corruption. This tool gives you instant, accurate encoding with zero configuration required.

Using the encoder is straightforward: paste or type your plain text string into the input field and the Base64-encoded result is generated immediately. The output is a continuous string of alphanumeric characters along with +, /, and = padding characters — for example, encoding Hello, World! produces SGVsbG8sIFdvcmxkIQ==. You can copy the result to your clipboard with a single click.

It's important to understand that Base64 encoding increases the size of your data by approximately 33%, since every 3 bytes of input become 4 characters of output. This is expected behavior, not an error. The tool handles standard UTF-8 text input, so accented characters, symbols, and most Unicode strings will encode correctly.

One edge case to be aware of: Base64 has two common variants — standard Base64 (using + and /) and URL-safe Base64 (using - and _ instead). This tool uses the standard variant. If you need output safe for use directly inside URLs or filenames without percent-encoding, make sure to swap those characters accordingly or use a URL encoder on the result.