Base64 Encoder & Decoder
Convert text and files to/from Base64 format instantly. Free, secure, and works entirely in your browser.
Input
Result
Result will appear here...
Options
Why Choose Our Base64 Tool?
Instant Conversion
Real-time encoding and decoding with auto-convert mode. See results as you type without clicking any buttons.
File Support
Upload files to encode or decode Base64 data back to files. Support for images, documents, and any file type up to 20MB.
URL-Safe Encoding
Toggle URL-safe Base64 encoding for use in URLs and filenames. Automatically converts +/= characters to -_.
100% Client-Side
All processing happens in your browser. Your data never leaves your device, ensuring complete privacy and security.
Copy & Download
One-click copy to clipboard or download results as text/file. Perfect for quick workflows and automation.
Error Handling
Clear error messages when decoding fails. Automatically detects invalid Base64 strings and provides helpful guidance.
How to Use the Base64 Converter
Follow these simple steps to encode or decode Base64 strings and files
Step 1: Choose Encode or Decode Mode
Click the 'Encode' tab to convert text or files to Base64 format. Click 'Decode' to convert Base64 strings back to readable text or downloadable files. The base64 converter switches modes instantly.
Step 2: Input Your Data
For encoding: Type or paste text directly, or click 'Upload File' to encode images, documents, or any file. For decoding: Paste your base64 string into the input area. The base64 decoder supports strings of any length.
Step 3: Configure Options (Optional)
Enable 'URL-Safe Base64' if you need the encoded output for URLs or filenames. Turn on 'Auto Convert' for real-time base64 encoding as you type. These options enhance your base64 conversion workflow.
Step 4: Get Your Result
The base64 result appears instantly in the output area. Click 'Copy' to copy the base64 string to clipboard, or 'Download' to save as a file. For decoded files, the download preserves the original file format.
Understanding Base64 Converter Options
Customize your base64 encoding and decoding experience with these powerful options
URL-Safe Base64 Encoding
Standard base64 uses characters (+, /, =) that have special meaning in URLs. URL-safe base64 encoding replaces '+' with '-', '/' with '_', and removes padding '=' characters. This makes the base64 output safe for use in web URLs, query parameters, and filenames without requiring additional URL encoding. Enable this option when you need to embed base64 data in URLs or create file-safe base64 strings.
Example: Standard: SGVsbG8gV29ybGQ+Cg== URL-Safe: SGVsbG8gV29ybGQ-Cg
Auto Convert Mode
When enabled, the base64 converter processes your input automatically as you type or paste. This real-time base64 conversion is perfect for quick testing, debugging base64 strings, or when working with small amounts of data. Disable auto convert for large files or when you want to review your input before encoding or decoding. The base64 tool remembers your preference for future visits.
Example: Type 'Hello' → Instantly see 'SGVsbG8='
File Upload for Base64 Encoding
Click 'Upload File' to convert any file to base64 format. This base64 encoder supports images (PNG, JPG, GIF), documents (PDF, DOCX), and any file type up to 20MB. The base64 file converter reads the file in your browser and generates the base64 string without uploading to any server. Perfect for creating data URIs, email attachments, or API payloads.
Example: Upload image.png → Get base64 string for embedding
Download Decoded Results
When decoding base64 to files, click 'Download' to save the original file. The base64 decoder automatically detects the file type when possible. For base64 text conversions, download saves as a .txt file. This feature makes our base64 converter tool ideal for extracting files from base64-encoded data in emails, JSON responses, or databases.
Example: Decode base64 image → Download as PNG file
Common Use Cases
API Development
Encode authentication tokens, API keys, or credentials for secure transmission in HTTP headers and requests.
Email Attachments
Convert files to Base64 for embedding in emails or JSON payloads. Useful for automated email systems and APIs.
Data URIs
Create data URIs for embedding images, fonts, or files directly in HTML and CSS without external requests.
Binary Data Transfer
Encode binary data for transmission over text-based protocols like JSON, XML, or YAML configuration files.
Database Storage
Store binary files or images as Base64 text in databases that don't support binary data types natively.
Web Development
Encode SVG icons, small images, or fonts directly into CSS or JavaScript for faster page loading.
Pro Tips for Base64 Conversion
Get the most out of our Base64 tool with these expert tips
Use Auto-Convert for Quick Testing
Enable auto-convert mode to see results instantly as you type. Perfect for debugging and quick validation of Base64 strings.
URL-Safe for Web Applications
Always use URL-safe encoding when including Base64 in URLs, query parameters, or filenames to avoid encoding issues.
Mind the File Size
Remember that Base64 increases file size by ~33%. For large files, consider using direct binary transfer instead of Base64.
Copy Format Matters
When using Base64 for data URIs, include the proper prefix: data:[MIME-type];base64,[Base64-string]. This ensures browsers can interpret the data correctly.
Frequently Asked Questions
What is Base64 encoding?
Is my data safe when using this tool?
What's the difference between standard and URL-safe Base64?
Can I encode files larger than text?
Why does my Base64 string fail to decode?
How do I use Base64 in web development?
Does Base64 encoding compress data?
Can I decode Base64 to get the original file?
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