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Base64 Encoder & Decoder

Encode plain text to Base64, decode Base64 back to readable text, or convert an image directly into a Base64 data URI, all instantly in your browser.

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Base64 Output

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PNG, JPG, GIF, WEBP, SVG supported

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Base64 Data URI

Upload an image to generate its Base64 data URI...

Advanced Features for Developers

Encode & Decode

Switch instantly between encoding plain text and decoding Base64 strings.

Image to Data URI

Convert any image directly into an embeddable Base64 data URI string.

Error Detection

Get an instant warning if your Base64 input is malformed or invalid.

100% Private

Everything runs locally in your browser — no files or text are ever uploaded.

Developer Guide

What is Base64 Encoding and Why Is It Used?

Base64 is a method of converting binary data, like images or files, into plain ASCII text made up of letters, numbers, and a few symbols. This makes it possible to safely embed binary content inside text-based formats such as JSON, XML, HTML, CSS, or email messages, which were not originally designed to handle raw binary data.

Common real-world uses include embedding small images directly inside CSS or HTML using data URIs to reduce HTTP requests, encoding authentication tokens and API keys, and attaching files to emails. It's important to remember that Base64 is an encoding format, not encryption, so it should never be used to protect sensitive data on its own.

Frequently Asked Questions

Simple answers to help you understand Base64 encoding

No, Base64 is not encryption and provides no real security. It's simply a way to represent binary data as text, and anyone can decode it back to the original content instantly using any Base64 decoder. Never use it alone to protect passwords or sensitive information.
The equals sign is padding added when the input data length isn't perfectly divisible by 3 bytes, which Base64 encoding requires for its grouping process. This padding tells the decoder exactly where the actual data ends, ensuring the original bytes are reconstructed correctly.
Base64 encoding increases file size by roughly 33 percent because it represents every 3 bytes of binary data using 4 text characters. This tradeoff is accepted because it allows binary content to travel safely through systems built only to handle plain text.
No. All encoding and decoding, including image conversion, happens entirely inside your browser using built-in JavaScript functions. Nothing you type or upload is ever sent to a server, which makes this tool safe for confidential text or private images.
A data URI lets you embed a small image directly inside your HTML or CSS file instead of linking to a separate image file, which can reduce the number of HTTP requests a browser needs to make. It's best suited for small icons or images, since large files make the encoded text unwieldy.