Base64 Encoder & Decoder
Encode text and files to Base64, or decode Base64 strings back to text. Free online Base64 converter. 100% private client-side processing.
What is the Base64 Encoder & Decoder?
Encode text and files to Base64, or decode Base64 back to text. 100% secure client-side tool. Built for optimal performance, this tool executes client-side directly in your browser without uploading your sensitive data to external servers.
How to use the Base64 Encoder & Decoder
- Choose your operating mode: 'Encode to Base64' or 'Decode from Base64'.
- Type or paste your raw text, binary string, or data URI into the input field.
- The tool executes instant RFC 4648 compliant encoding/decoding in real time.
- Copy the result or use it directly in HTTP Authorization headers, data URIs, or JSON payloads.
Example: Encoding Basic Auth Credentials
Mode: Encode | String: user_admin:s3cr3tP@ss
dXNlcl9hZG1pbjpzM2NyM3RQQHNz
Prepares credentials for standard 'Authorization: Basic <base64>' HTTP headers.
Technical Guide & Privacy Assurance
Base64 increases payload size by approximately 33%. For transmitting large images or files over the wire, prefer raw binary streaming or WebP formats where possible.
Frequently Asked Questions
Can I encode files to Base64?+
Yes, you can click 'Upload File' to select an image, PDF, or document. It will be converted into a Base64 data URI string.
Are my files uploaded to a server?+
No. The entire conversion process happens in your web browser. Your files never leave your computer.
How do I decode a Base64 string?+
Click the 'Decode' toggle at the top, paste your Base64 string into the input box, and the decoded text will appear instantly.