Free Online Base64 Encoder & Decoder

Convert text, images, and files to Base64 format instantly. Whether you need to embed an image directly into HTML/CSS (Data URI) or decode a hidden string, RootUtils handles it securely in your browser.

Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It is essential for transmitting data over media that are designed to deal with textual data, such as Email (MIME) and XML.

Encoding vs. Encryption

This is the #1 misconception. Base64 is NOT encryption.

Encoding (Base64): Reversible by anyone. Designed for data compatibility, not security.
Encryption (AES/RSA): Requires a secret key to reverse. Designed for secrecy.

⚠️ Never store passwords or API keys in Base64 thinking they are secure.

The 33% Size Increase

Base64 uses 4 characters to represent every 3 bytes of binary data. This results in a file size increase of approximately 33%.

Original Image:100 KB

Base64 String:~133 KB

Common Use Cases

Data URIs

Embed small icons/logos directly into HTML or CSS to avoid an extra HTTP request.
src="data:image/png;base64..."

File Uploads

Developers use the FileReader API to convert images to Base64 strings for previewing images before upload.

Email (MIME)

Email protocols were originally text-only. Attachments are still Base64 encoded to travel safely over SMTP without corruption.

FAQ

Can I decode an image?

Yes. If you have a Base64 string that starts with data:image/..., you can paste it into the "Decode" box. While this tool shows the raw text, browsers can render that string as an image tag.

Is this secure?

Yes. All conversion happens client-side using JavaScript. Your files or strings are never uploaded to our servers.

Base64 Converter

Is this tool broken?