Base64 Image Encoder
ImageConvert images to base64 encoded strings for HTML, CSS, and data URIs
Drag & drop files here
or click to browse
Accepted: image/*
Large file performance?
Browser local processing works best on Desktop for files over 100MB.
What is Base64 Encoding?
Base64 encoding converts binary image data into ASCII text format. This is useful for:
- Embedding images directly in HTML or CSS
- Data URIs in web development
- Email attachments
- JSON/API data transfer
Note: Base64 encoding increases file size by approximately 33%. Use for small images or when embedding is necessary.
Deep Dive: Base64 Image Encoder
Base64 encoding converts binary image data into ASCII text strings. This is useful for embedding images directly in HTML, CSS, or JSON without separate file references. The encoded string uses the data URI scheme (data:image/png;base64,...) which browsers can render directly. All processing happens in your browser—your images never leave your device.
Related Articles
Learn more about this tool and related topics in our blog.
Image Optimization for Web: Faster Pages Without Sacrificing Quality
Score 100 on PageSpeed Insights. Learn the professional secrets of WebP conversion, lazy loading, and intelligent image optimization.
Base64 Image Encoding: Technical Analysis and Appropriate Use Cases
Boost your website speed by baking images directly into your code. Learn when (and when not) to use Base64 encoding for web assets.
Privacy Architecture
This tool uses client-side WebAssembly to ensure your data never touches a server. Secure, fast, and 100% private by design.
Core Capabilities
- Encode JPG, PNG, WebP, GIF images
- Instant base64 conversion
- Copy encoded string to clipboard
- Download as .txt file
- See original vs encoded size
- Image preview before encoding
- 100% Client-side (Private)
- No file uploads to server
Why It Matters
- Embedding: Include images directly in HTML/CSS without separate files
- Speed: One HTTP request instead of multiple for small images
- Portability: Self-contained HTML files with embedded images
- APIs: Send images as JSON data strings
- Privacy: No server uploads—all processing local
Quick Start Guide
Upload an image file (drag & drop or click)
Base64 encoding happens instantly
Preview the image and encoded string
Copy the base64 string or download it
Use in your HTML, CSS, or code!
Usage Examples
HTML Image Tag
Scenario 01Embed image directly in HTML
logo.png (5KB)
<img src="data:image/png;base64,iVBORw0KGgo..." />
CSS Background
Scenario 02Use in CSS without external file
icon.png (2KB)
background: url(data:image/png;base64,iVBORw0...) no-repeat;
JSON API
Scenario 03Send image data in JSON
photo.jpg (20KB)
{"image": "data:image/jpeg;base64,/9j/4AAQSkZJ..."}Common Scenarios
Email Signatures
Embed logo in HTML email signature
Single-File HTML
Create self-contained HTML with images
API Image Upload
Send images as JSON strings
Questions?
Technical Architecture
How Base64 Encoding Works
**The Process**: 1. Read image as binary data 2. Convert binary to base64 text encoding 3. Add data URI prefix (data:image/TYPE;base64,) 4. Result: ASCII string browsers can render **Why Use It?** - Embed images without separate files - Include in text-only contexts (JSON, XML) - Self-contained HTML documents - Email signatures with logos **Size Impact**: 33% larger than original - 10KB image → 13.3KB base64 - 100KB image → 133KB base64
Data URI Format
**Structure**: ``` data:image/png;base64,iVBORw0KGgoAAAANSUh... ``` **Components**: - `data:` - Scheme identifier - `image/png` - MIME type (png/jpeg/gif/webp) - `;base64,` - Encoding type delimiter - `iVBORw0...` - Actual encoded image data **Browser Support**: All modern browsers - Chrome, Firefox, Safari, Edge: ✅ - IE9+: ✅ - Mobile browsers: ✅
Keep Exploring
Power up your workflow with related utilities.
Related Tools
Compress PDF - Reduce Size
Shrink your massive PDF files so they actually fit in an email. Super fast, totally private, and you don't lose quality.
Secure Password Generator
Instant, uncrackable passwords using the same standards as big banks. Customize length, symbols, and complexity for ultimate online security.
UUID / GUID Generator
Generate standards-compliant UUIDs (v1, v4) for databases and APIs. Supports bulk generation up to 1000 IDs with hyphen and case controls.
Related Articles
Learn more about this tool and related topics in our blog.
Image Optimization for Web: Faster Pages Without Sacrificing Quality
Score 100 on PageSpeed Insights. Learn the professional secrets of WebP conversion, lazy loading, and intelligent image optimization.
Base64 Image Encoding: Technical Analysis and Appropriate Use Cases
Boost your website speed by baking images directly into your code. Learn when (and when not) to use Base64 encoding for web assets.