Encode to Base64 Online — String & File Converter

Our free Base64 Encoder lets you quickly convert any text or file into a Base64-encoded string. Paste your text or upload a file, click Encode, and instantly get a clean Base64 output ready to use in HTML, CSS, JSON, or anywhere else. No registration. No data storage. Works entirely in your browser for maximum privacy.

Text to encode:

Result:

How to Encode to Base64 Online?

Encoding text or files to Base64 is useful for embedding binary data into text formats, such as HTML, CSS, or JSON, in a safe and readable way.

To encode your data to Base64:

Paste your text into the input field or upload a file.
Click Encode.
Your Base64-encoded result will appear instantly. Copy, download, or embed it as needed.

Why Use a Base64 Encoder?

Instant Encoding

Quickly convert any string or file into Base64 without installing software.

Clean & Compatible Output

Get properly formatted Base64 output ready to use in HTML, CSS, JSON, or other text-based formats.

Secure & Private

All encoding happens locally in your browser — your data never leaves your device.

String & File Support

Encode plain text, documents, or images to Base64 with ease.

Optional URL-Safe Encoding

Choose URL-safe Base64 format when you need it for web links or APIs.

Developer-Friendly

Perfect for embedding images in HTML/CSS or transmitting binary data in JSON.

Base64 Encoding – Frequently Asked Questions

What is a Base64 Encoder?
A Base64 Encoder is a tool that converts binary or text data into a Base64-encoded string. Base64 is commonly used to embed images or files in HTML/CSS, transmit binary data via JSON or XML, and store data in text-based formats.
Why do people use Base64 encoding?
Base64 allows binary data to be represented using only text characters, making it safe to include in HTML, CSS, JSON, XML, or email content without data corruption.
Can I encode files to Base64?
Yes. You can upload an image, document, or other file and instantly convert it to a Base64 string. Images will include their MIME type for easy embedding in HTML or CSS.
Is Base64 encoding secure?
No, Base64 is not encryption — it’s only an encoding method. It does not hide or protect data. Anyone can decode it back to the original form.
Does Base64 make files larger?
Yes. Base64 increases the size of your data by roughly 33%, so it’s best used for small assets or when text-only transmission is required.
What is URL-safe Base64?
URL-safe Base64 replaces certain characters (+ and /) with - and _ to make the encoded string safe to use in URLs without extra encoding.