Tool Guide
A Complete Guide to using Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 strings instantly.
What exactly is the Base64 Encoder / Decoder?
The Base64 Encoder/Decoder converts text to Base64 encoding and back. Base64 is a binary-to-text encoding scheme used extensively in web development for embedding data in HTML, transmitting data in URLs, and encoding authentication credentials.
Our tool supports full UTF-8 text, meaning it correctly handles special characters, emojis, and non-Latin scripts. The encoding and decoding happen entirely in your browser — no data is ever transmitted to external servers.
How to Use This Tool
Encode or decode Base64 in three steps:
- Select 'Encode' to convert text to Base64, or 'Decode' to convert Base64 back to text.
- Enter your text or Base64 string in the input area.
- Click the Encode/Decode button to see the result instantly.
- Copy the output with the Copy Result button.
Common Developer Use Cases
Base64 encoding is used throughout web development:
- Data URIs: Embed small images directly in HTML/CSS using Base64-encoded data URIs.
- API Authentication: Encode credentials for HTTP Basic Authentication headers.
- Email Attachments: MIME encoding uses Base64 to transmit binary attachments through text-based email protocols.
- JWT Tokens: JSON Web Tokens use Base64url encoding — decode them to inspect payload contents.