Image to Base64 Converter
Convert images to Base64 encoded strings online. Drag and drop PNG, JPG, GIF, SVG, or WebP files to get Data URIs for HTML, CSS, and JSON.
Click to upload or drag and drop
PNG, JPG, GIF, SVG, WebP, ICO (max 10 MB)
About Image to Base64
Base64 encoding converts binary image data into an ASCII text string. This allows you to embed images directly in HTML, CSS, JSON, or any text-based format without separate file requests.
A Data URI (data:image/png;base64,...) can be used directly as an src attribute in an <img> tag or as a background-image URL in CSS. Note that Base64 encoding increases the data size by approximately 33%.
All processing happens client-side in your browser. Your images are never uploaded to any server.
How to Use This Image to Base64 Converter
This free online tool converts any image file to a Base64 encoded string. Use the resulting Data URI to embed images directly in your HTML, CSS, or JavaScript code.
- Upload your image — click the upload area or drag and drop an image file (PNG, JPG, GIF, SVG, WebP, up to 10 MB).
- Choose output format — select "Data URI" for a ready-to-use string with MIME type prefix, or "Raw Base64" for just the encoded data.
- Copy the output — use the copy button to copy the Base64 string to your clipboard.
- Use in your code — paste the Data URI directly into an HTML img src attribute, CSS background-image, or JSON payload.
Everything runs locally in your browser using the FileReader API. Your images are never uploaded to any server.
Common Use Cases
- Inline images in HTML — Embed small icons and logos directly in HTML without extra HTTP requests.
- CSS background images — Use Data URIs as background-image values for small UI elements and patterns.
- Email templates — Include images inline in HTML emails where external images may be blocked.
- API payloads — Send image data as Base64 strings in JSON API requests and responses.
- NFT metadata — Embed small images directly in on-chain NFT metadata JSON to avoid external dependencies.
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Frequently Asked Questions
What is Base64 image encoding?
Base64 encoding converts binary image data into an ASCII text string using 64 characters (A-Z, a-z, 0-9, +, /). This allows images to be embedded directly in HTML, CSS, JavaScript, and JSON files as text, eliminating the need for separate image file requests.
What is a Data URI?
A Data URI is a scheme (data:) that allows you to include data inline in web pages as if they were external resources. For images, a Data URI looks like 'data:image/png;base64,iVBOR...' and can be used directly as the src attribute of an img tag or as a CSS background-image URL.
Does Base64 encoding increase file size?
Yes, Base64 encoding increases the data size by approximately 33% compared to the original binary file. For example, a 30 KB image becomes roughly 40 KB when Base64 encoded. This trade-off is acceptable for small images (icons, thumbnails) but not recommended for large images.
When should I use Base64 images?
Base64 images are ideal for small icons, thumbnails, or UI elements (under 10 KB) where eliminating an HTTP request improves performance. They are also useful in email templates where external images may be blocked, in single-file HTML documents, and in JSON payloads that need to include image data.
Which image formats are supported?
This tool supports all common image formats including PNG, JPEG/JPG, GIF, SVG, WebP, ICO, BMP, and TIFF. The Data URI will use the correct MIME type for each format (e.g., data:image/png for PNG files).
Is my image data sent to a server?
No. All processing happens entirely in your browser using the FileReader API. Your images never leave your device and are not uploaded to any server. This makes the tool safe for sensitive or private images.
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