Free Image to Base64 Converter
Convert images to Base64 encoding for HTML/CSS embedding. Instant conversion with code snippets for developers.
Click to upload an image
Converts images to Base64 encoding (JPG, PNG, WebP, GIF, SVG)
💡 Use Cases
- Embed in HTML/CSS: No external image files needed
- Email signatures: Images display without external hosting
- JSON/API: Send images as text in API responses
- Development: Quick testing without file hosting
- Note: Base64 increases file size by ~33%, use for small images
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Everything You Need to Know
Complete guide, features, use cases, and frequently asked questions
What is Image to Base64 Conversion?
Image to Base64 conversion transforms image files into text strings that can be embedded directly in HTML, CSS, JavaScript, and JSON. Our converter instantly encodes images to Base64 data URIs, making them portable and eliminating the need for external image files. Perfect for email signatures, inline CSS, API responses, and development testing. Get full data URIs, Base64-only strings, or ready-to-use HTML and CSS code snippets with one-click copying.
How to Convert Images to Base64
- Upload your image by clicking the upload area
- View instant preview of your uploaded image
- Copy the full Data URI for direct use in HTML src attributes
- Copy Base64-only string (without prefix) for custom implementations
- Use quick-copy buttons for HTML img tag or CSS background snippets
- Download the Base64 string as a .txt file for storage
- View usage examples showing HTML and CSS implementation
- Click "Upload New" to convert another image
Key Features
Instant Encoding
Convert any image to Base64 instantly with real-time encoding as soon as you upload.
Multiple Output Formats
Get full Data URI, Base64-only string, HTML img tag, or CSS background-image code - all with one-click copying.
Code Snippets
Ready-to-use HTML and CSS code examples show exactly how to implement your Base64 image in code.
File Size Display
See the encoded size in KB to understand storage and bandwidth implications before use.
Text File Export
Download Base64 string as .txt file for storage, documentation, or sharing with team members.
Universal Format Support
Works with JPG, PNG, WebP, GIF, SVG, and all common image formats.
Common Use Cases
Email Signatures
Embed images directly in HTML email signatures without external hosting, ensuring images always display.
Inline CSS Backgrounds
Embed small images like icons and logos directly in CSS files, reducing HTTP requests and improving load times.
JSON API Responses
Include images in JSON API responses as Base64 strings for seamless data transmission.
Single-File HTML Pages
Create self-contained HTML files with embedded images that work offline without external dependencies.
Quick Testing
Test image rendering in development without setting up file hosting or dealing with relative paths.
Data URI Schemes
Generate RFC 2397 compliant data URIs for use in any context that accepts URLs.
Why Choose Our Base64 Converter
- ✓Instant conversion with real-time encoding
- ✓Multiple output formats for different use cases
- ✓One-click copy for Data URI, Base64, HTML, and CSS
- ✓Ready-to-use code snippets save development time
- ✓File size display helps you make informed decisions
- ✓Download as text file for archival or documentation
- ✓Supports all image formats including SVG
- ✓No file size limits or conversion restrictions
- ✓All processing in browser - complete privacy
- ✓Free forever with unlimited conversions
Frequently Asked Questions
What is Base64 encoding?
Base64 encoding converts binary image data into ASCII text using 64 characters (A-Z, a-z, 0-9, +, /). This allows images to be embedded directly in text-based formats like HTML, CSS, and JSON.
Does Base64 increase file size?
Yes, Base64 encoding increases file size by approximately 33% compared to the original binary image. A 100KB image becomes about 133KB when encoded.
When should I use Base64 images?
Use Base64 for small images (icons, logos under 10KB), email signatures, single-file HTML pages, or when you need to avoid external file dependencies. For large images, regular image files are more efficient.
What is the difference between Data URI and Base64?
Data URI includes the complete string with MIME type prefix (data:image/png;base64,...). Base64-only is just the encoded data without the prefix. Data URI is ready to use in HTML/CSS, while Base64-only is for custom implementations.
Can I use Base64 images in CSS?
Yes! Use the "Copy as CSS background" button to get a ready-to-use CSS declaration: background-image: url('data:image/...');
Will Base64 images work in all browsers?
Yes, Base64 data URIs are supported in all modern browsers (Chrome, Firefox, Safari, Edge) and have been for many years.
Are there size limits for Base64 encoding?
Our tool has no size limits, but be aware that very large Base64 strings can cause performance issues in some contexts. Keep encoded images under 100KB when possible.
Is my image uploaded to a server?
No! All encoding happens in your browser using JavaScript. Your images never leave your device.
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