Base64 Encoder & Decoder
Encode and decode UTF-8 text, Unicode, emojis, and binary files to Base64 and Data URIs with URL-safe mode.
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How to Use Base64 Encoder & Decoder Online
1. Select Mode
Choose Text Mode for string encoding/decoding or File Mode for binary file conversion.
2. Enter Data or Upload File
Type text or drop an image/document to encode into Base64 or Data URI format.
3. Copy or Download
Copy the Base64 string, copy Data URI markup, or download the decoded binary file.
Key Features & Specifications
Full UTF-8 Unicode Support
Proper multi-byte encoding preserves emojis, Gujarati, Hindi, and international alphabets.
URL-Safe Character Mode
Substitutes + and / with - and _ for safe use in URL parameters and web tokens.
MIME Line Wrapping
Formats Base64 strings with standard 76-character line breaks for email headers and certificates.
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Your files never leave your device. All processing operations execute directly inside your browser memory using HTML5, Canvas, and TypedArray APIs. Zero server uploads, zero remote storage.
Frequently Asked Questions
How do I convert a Base64 string back into a downloadable file?
Switch to File Mode, paste the Base64 string or Data URI, and click Decode File to download the original binary file.
What is URL-safe Base64?
Standard Base64 contains + and / characters which carry special meaning in URLs. URL-safe mode replaces them with - and _.