Base64 is a binary-to-text encoding scheme that converts binary data into text using 64 ASCII characters. It is used to safely transmit binary data over text-based protocols, embed images in HTML/CSS, and store binary data in text-only systems.

Can I encode files with this tool?

Yes. In encoding mode, you can upload files up to 5MB. The tool supports images and other file types and converts them to Base64 for data URIs or API transfers.

What happens if I decode invalid Base64?

If you enter an invalid Base64 string in decode mode, the tool shows an error and does not output a result. Base64 must use valid characters and proper padding.

Is there a size limit for encoding?

For file uploads, the limit is 5MB. For text input, you can encode large strings, but very large inputs may affect browser performance.

Can I use the encoded output directly in web development?

Yes. Base64 output can be used in data URIs (data:image/png;base64,...), JSON APIs, and any place you need to embed binary data as text.

Is my data secure when using this tool?

All encoding and decoding happens locally in your browser. Your data never leaves your device.

What is Base64 encoding?

Base64 is a binary-to-text encoding scheme that represents binary data in ASCII characters. It is widely used for data URIs, APIs, email attachments, and any system that needs text-safe binary data.

Common use cases

Data URIs: Embed images directly in HTML/CSS.
API integration: Send binary data in JSON payloads.
Email: MIME encoding for attachments.
Storage: Store binary data in text-only fields.
Configs: Embed binary data in XML/JSON configs.

How it works

Base64 converts every three bytes of data into four ASCII characters. If the input is not divisible by three, padding characters (=) are added.

Features

Switch between encode and decode instantly.
Upload files up to 5MB for conversion.
Real-time conversion with error handling.
One-click copy to clipboard.
Client-side processing for privacy.