Base64 Image Converter
Encode images to Base64 data URIs securely in your browser. Drag and drop PNG, JPG, WebP, or SVG files to instantly generate HTML, CSS, and raw Base64 snippets. No images are ever uploaded to a server.
Drag and drop an image here
or click to browse files (PNG, JPG, WebP, SVG)
Image Preview
HTML `<img>` Tag
CSS `background-image`
Raw Base64 String
How ZeroData protects your privacy
- ✓ No Uploads: Processing happens entirely via client-side JavaScript.
- ✓ No Storage: We do not have a database. We physically cannot save your data.
- ✓ No Tracking: We don't log what you process or track your inputs.
- ✓ Verifiable: Check your DevTools Network tab. You will see 0 outbound requests.
How to Convert an Image to Base64
This tool uses the HTML5 FileReader API to convert images to Base64 encoding entirely within your browser.
It is designed to be 100% secure — your image files never leave your device.
When to Use Base64 Images
- Small UI Icons: Embed small SVG or PNG icons directly into CSS to avoid extra HTTP requests.
- HTML Email Signatures: Ensure images are displayed immediately in emails without relying on external hosting.
- Offline Web Apps (PWAs): Bundle critical visual assets directly into the initial HTML payload.
- JSON Payloads: Send image data through REST APIs by converting binary files to Base64 text strings.
Performance Considerations
Base64 encoding increases file size by approximately 33%. For large photographs or hero images, we recommend using standard external image links so they can be cached effectively by the browser and CDN. Base64 is best suited for small icons and micro-assets under 50KB.
Common Use Cases
- Embedding small PNG or SVG icons directly into CSS stylesheets to reduce HTTP requests.
- Creating self-contained HTML email signatures that display images without external hosting.
- Bundling critical visual assets into offline-capable Progressive Web Apps (PWAs).
- Sending image data through REST APIs by converting binary files to Base64 text strings.
- Generating inline image previews for drag-and-drop file upload components.
Frequently Asked Questions
Is it safe to encode private images here?
Yes. This tool uses the HTML5 FileReader API and runs 100% in your browser. Your image files are never transmitted to any server. You can verify this by opening your browser's DevTools Network tab — you will see zero outbound data requests when converting images.
What image formats are supported?
This tool supports PNG, JPEG (JPG), WebP, and SVG formats. These cover virtually all image types used in web development, email signatures, and API payloads.
Does Base64 encoding increase file size?
Yes. Base64 encoding increases the data size by approximately 33% because it converts binary data into ASCII text. This is why Base64 images are best suited for small icons and micro-assets under 50KB. For larger images like hero banners or photographs, use standard external image files so they can be cached by browsers and CDNs.
When should I use Base64 images instead of regular image files?
Use Base64 images for small UI icons (to eliminate extra HTTP requests), HTML email signatures (to ensure images display without external hosting), offline web apps / PWAs (to bundle critical assets), and REST API payloads (to send image data as text strings). Avoid Base64 for large images like hero banners or product photos.
What is a Data URI?
A Data URI is a string that embeds file data directly into HTML or CSS using the format data:[mimetype];base64,[encoded-data]. Instead of referencing an external URL, the browser decodes the Base64 string and renders the image inline. This eliminates an HTTP request but increases the initial HTML/CSS payload size.