Image to Base64 Converter
Convert images to Base64 encoded strings for embedding in HTML, CSS or JSON.
Supports PNG, JPG, GIF, SVG, WebP
What Is a Base64 Image Encoder?
Base64 is a binary-to-text encoding scheme that represents binary data — like image files — as an ASCII string.
This tool reads your image file entirely in the browser and converts it to a Base64-encoded string, optionally
wrapped in a Data URI (e.g., data:image/png;base64,...). No data is ever uploaded
to any server; everything runs locally in your browser for complete privacy.
The resulting string can be embedded directly into HTML <img> tags, CSS
background-image properties, JSON configuration files, or anywhere else that expects a URL — but
without needing a separate file hosted on a server.
How to Use This Tool
- Upload: Click the upload area or drag and drop any PNG, JPG, GIF, SVG, or WebP image (up to 10 MB).
- Preview: An instant preview of your image is shown so you can verify the correct file was loaded.
- Choose output format: Switch between Data URI, Raw Base64, CSS background shorthand, or a full HTML
<img>tag. - Copy: Hit "Copy to Clipboard" to grab the output and paste it into your code.
- Review stats: See the original vs. encoded size and the overhead percentage so you can make an informed decision about inlining.
Common Use Cases for Base64 Images
- Email templates: Inline images in HTML emails to avoid blocked external images.
- Single-file HTML pages: Bundle icons and logos directly in the HTML to remove external dependencies.
- CSS sprites / icons: Embed small icons in a stylesheet to reduce HTTP requests.
- REST API payloads: Send images as JSON fields when a binary upload endpoint is unavailable.
- Offline / PWA apps: Store images as Base64 in localStorage or IndexedDB.
- SVG data URIs: Embed SVG graphics inline in HTML or CSS without separate file references.
Frequently Asked Questions
Does my image get uploaded to your server?
No. The entire conversion happens inside your browser using the FileReader API. Your image never leaves your device, making this tool completely private and safe for sensitive assets.
Why is the Base64 string larger than the original file?
Base64 encoding represents every 3 bytes of binary data as 4 ASCII characters, resulting in approximately a 33–37% size increase. This is an expected trade-off when converting binary data to a text-safe format.
What is the difference between a Data URI and raw Base64?
A Data URI includes the MIME type prefix (data:image/png;base64,) and is ready to be used directly in HTML src or CSS url() attributes. Raw Base64 is just the encoded string without the prefix, useful when the destination system (like a JSON field or API) already knows the content type.
Is there a file size limit?
This tool enforces a soft limit of 10 MB to prevent browser performance issues. In practice, it is recommended to only inline small images (under ~20–30 KB) via Base64. Larger images increase HTML/CSS payload size and can hurt page load performance.
Can I use the output in a <img> tag directly?
Yes! Switch to the "HTML <img>" tab to get a ready-to-paste <img src="data:..."> snippet. All modern browsers support Data URI images in HTML, CSS, and JavaScript.
Does Base64 encoding affect image quality?
No. Base64 is a lossless encoding — it is just a different representation of the same binary data. When the browser decodes the Base64 string, the resulting image is pixel-for-pixel identical to the original file.