Base64 Converter is a powerful and user-friendly web-based online tool for encoding and decoding Base64 strings with support for multiple character encodings.
Base64 Converter Tool
Supported Features:
- Automatically detects if the input is base64 encoded by:
- Checking if the string length is valid (multiple of 4)
- Verifying it only contains valid base64 characters
- Attempting to decode and re-encode to confirm validity
- Multiple Encoding Support(UTF-8, ASCII, ISO-8859-1, UCS-2)
- File Upload:
- Supports reading text files
- Automatically processes file contents
- Copy to Clipboard:
- Copy button that appears when there’s a result
- Shows feedback when copied
- Disables when there’s no content to copy
Usage
Basic Text Conversion
- Enter or paste your text in the input textarea
- Choose your preferred mode:
- Auto Detect: Automatically determines if the input is Base64 encoded
- Encode: Force Base64 encoding of the input
- Decode: Force Base64 decoding of the input
- Select your character encoding:
- UTF-8 (default, recommended for most uses)
- ASCII
- ISO-8859-1
- UCS-2
- View the result below the input area
- Click “Copy Result” to copy the converted text to clipboard
File Processing
- Click “Upload File” to select a text file
- The file content will be loaded into the input area
- Conversion happens automatically based on your selected mode and encoding
Character Encodings
- UTF-8: Universal character encoding, supports all Unicode characters (default)
- ASCII: Basic 7-bit encoding, supports English characters and common symbols
- ISO-8859-1: 8-bit encoding, supports Western European characters
- UCS-2: Fixed-width 16-bit encoding, supports Basic Multilingual Plane
Technical Implementation
The converter is built using pure JavaScript with the following key components:
TextEncoder
/TextDecoder
for handling various character encodingsbtoa
/atob
for Base64 conversion- Regular expression validation for Base64 string detection
- File API for handling file uploads
- Clipboard API for copy functionality
Automatic Base64 Detection
The tool uses a multi-step validation process to detect Base64 strings:
- Length validation (must be multiple of 4)
- Character set validation (A-Z, a-z, 0-9, +, /, =)
- Padding validation
- Decode/encode round-trip verification
Error Handling
The converter includes comprehensive error handling for:
- Invalid Base64 strings
- Unsupported characters in selected encoding
- File reading errors
- Clipboard operation failures
Browser Compatibility
The tool requires a modern browser that supports:
- Clipboard API
- ES6+ JavaScript
- TextEncoder/TextDecoder APIs
- File API
Do you have any feature requests or any issues/bugs to report? Feel free to contact us!