Image to Base64 Converter
Base64 Output
Usage Example:
Free Online Image to Base64 Converter - Encode Images to Data URI
Convert images to Base64 strings online for free with imgBig.com. Encode any image into a Base64 data URI string for embedding directly in HTML, CSS, JSON, SVG, and email templates. No server upload needed — encoding happens entirely in your browser for instant results and complete privacy. Copy the Base64 string with one click and paste it into your code. Perfect for web developers who want to reduce HTTP requests by inlining small images, embedding images in API payloads, creating self-contained HTML files, or including images in email templates that work across all email clients. Supports JPG, PNG, WebP, GIF, and all common image formats.
How to Convert an Image to Base64
- Upload your image by clicking, dragging, or pasting a URL
- The image is automatically encoded to a Base64 string
- Click "Copy" to copy the Base64 data URI to your clipboard
- Paste the string into your HTML, CSS, JSON, or email template
Frequently Asked Questions
What is a Base64 image?
A Base64 image is an image encoded as a text string using Base64 encoding. It starts with "data:image/..." and can be used directly in HTML src attributes or CSS url() functions without needing a separate file.
When should I use Base64 images?
Base64 is ideal for small images (icons, logos, tiny graphics) under 10KB. For large photos, separate files are better because Base64 increases file size by ~33% and can't be cached separately.
How do I use a Base64 image in HTML?
Use it in an img tag: <img src="data:image/png;base64,..."> or in CSS: background-image: url("data:image/png;base64,..."). Our tool provides a usage example.
Why Use Base64 for Images?
- Inline images - Embed images directly in HTML or CSS without external file requests
- API payloads - Include images in JSON data for REST APIs and web services
- Email templates - Embed images in HTML emails without CID attachments
- Single-file apps - Bundle images with code in one self-contained file
- SVG embedding - Use raster images inside SVG files as data URIs