Base64 Encoder / Decoder (Text & Files)
Universal Base64 encoder and decoder. Encode plain text, decode Base64 strings, or upload images and files to generate direct Data URIs for CSS and HTML embeddings.
Key Features & Security Guarantees
- ✓ Bidirectional Text encoding and decoding with UTF-8 character support
- ✓ Image & File to Base64 Data URI generator for HTML/CSS embedding
- ✓ Live image preview from decoded Base64 strings
- ✓ URL-Safe Base64 encoding toggle
How to Use This Utility
Select Mode: Choose Text Encode/Decode or Image to Base64 Data URI.
Input Data: Paste your string or upload an image file.
Copy Result: Copy the resulting Base64 string or Data URI with 1 click.
Technical Architecture & How It Works
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format by translating 24 bits into four 6-bit Base64 digits. This tool uses native browser btoa/atob and TextEncoder pipelines to prevent character corruption across UTF-8 multilingual strings.
Security Verification: All encoding and decoding operations execute on your device with 100% privacy.
Underlying Browser APIs
Real-World Developer Use Cases
CSS & HTML Image Inlining
Embed small icons and SVGs directly into CSS stylesheets to eliminate extra HTTP requests.
Authentication Headers
Encode Basic Auth usernames and passwords for API testing.
Frequently Asked Questions
Does this tool support special UTF-8 characters like emojis and accents?
Yes! We use modern TextEncoder/TextDecoder to properly encode and decode emojis and non-ASCII characters without errors.
What is a Base64 Data URI and where is it used?
A Data URI allows you to embed files directly into HTML (e.g. <img src="data:image/png;base64,...">) or CSS without hosting an external file.