Base64 Encode / Decode
This Base64 tool is an essential online utility for developers: encode and decode text and images as Base64. It supports text input, image import, smart detection and file export — a complete Base64 solution for web development and data processing.
Key features
🔐 Base64 encode
Convert text or images to Base64 — common in web development, data transfer and storage. Supports all major image formats.
Input:
Hello WorldOutput:
SGVsbG8gV29ybGQ=Image example:
Input:
image.jpgOutput:
/9j/4AAQSkZJRgABAQEA...
🔓 Base64 decode
Decode a Base64 string back to the original text or image, with smart detection and automatic error checking.
- Smart image detection
- Automatic image-format detection
- Live image preview
- Automatic format validation
- Error-position hints
- UTF-8 support
📁 File handling
Import and export text and image files for easy batch processing and data management.
- Text file import (TXT, JSON, CSS, JS, …)
- Image import (JPG, PNG, GIF, WebP, …)
- Export results
- Image preview
- Preserves encoding
- Large files (up to 10MB)
🔧 Smart detection
Automatically detects input and file type, with relevant suggestions and previews.
- Base64 format detection
- Image magic-bytes detection
- Automatic file-type detection
- Smart charset detection
- Data-type detection
- Processing suggestions
How to use
Enter data or import a file
Type text in the editor on the left, or use “Import text file” to load a document, or “Import image” to load an image.
Choose an action
Click “Encode” to convert text or an image to Base64, or “Decode” to turn Base64 back into text or an image. Imported images show their encoded result automatically.
View the result and preview
The result appears on the right; images show a visual preview and errors appear at the bottom. One-click copy and export are supported.
What is Base64?
Base64is an encoding that represents binary data using 64 printable characters. It is widely used when binary data must travel over text-based protocols (HTTP, SMTP), keeping the data intact in transit.
Key Base64 features
- Safe transport: convert binary data to text to avoid corruption in transit.
- Highly compatible: works with all text protocols and systems — great compatibility.
- Reversible encoding: encoding and decoding are fully reversible with no data loss.
- Standardized: follows the RFC 4648standard
Base64 alphabet
Standard characters (0–63)
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/
Includes upper- and lower-case letters, digits and two special characters.
Padding character
=
Used to pad the encoded length so the result is a multiple of 4.
Base64 use cases
📧 Email attachments
Sending binary file attachments over SMTP
🌐 Web data transfer
Sending images, documents and other binary data over HTTP
🖼️ Image embedding
Data URIs for CSS background-image and HTML tags
📱 Mobile apps
Image caching and offline image storage in apps.
🔐 Data storage
Store binary data inside text databases or config files.
🔑 Credentials
Encoding HTTP Basic auth, API keys and other credentials
Why image Base64
⚡ Fewer HTTP requests
Embed small images directly in HTML or CSS to cut network requests and speed up page loads.
📦 Easy transport
Image data can travel as text through APIs, with no separate file-upload endpoint.
🔒 Safe & reliable
Avoid exposing image file paths, prevent hotlinking, and improve data security.
💾 Offline storage
Store image Base64 in local storage for offline image caching.