Convert images to Base64 encoded strings for HTML, CSS, and APIs
Upload Image
Drop an image here or click to browse
PNG, JPG, GIF, SVG, WebP, AVIF
Output
Upload an image to see the Base64 output
Convert any image file to a Base64-encoded data URI directly in your browser. No server upload required — your files stay private. Use the output to embed images directly in HTML, CSS, JavaScript, or API payloads. Supports PNG, JPG, GIF, SVG, WebP, AVIF, and any other image format your browser can read.
How to Use
- 1Drop an image file into the upload zone or click to browse
- 2See the image preview and file metadata (MIME type, size)
- 3Choose output format: Data URI, Base64 only, CSS background, or HTML <img>
- 4Copy the output to clipboard or download as a .txt file
Frequently Asked Questions
What is a Base64 data URI?
A data URI is a string that embeds file content directly into HTML or CSS, formatted as data:[mime-type];base64,[encoded-data]. It lets you use images without separate HTTP requests, which can speed up small-image-heavy pages.
Is my image uploaded to a server?
No. This tool uses the browser's built-in FileReader API entirely client-side. Your image never leaves your device.
Why is the Base64 string 33% larger than the original?
Base64 encoding converts 3 bytes of binary data into 4 ASCII characters, adding roughly 33% overhead. This is a trade-off for text compatibility when you need to embed binary data in HTML, CSS, or JSON.