Free Image to Base64 Converter Online
Convert any image to a Base64 data URL — paste it directly into CSS, HTML, or JSON. Your image never leaves your browser.
How it works
Upload or drop an image
Click the upload area or drag and drop any image file.
Get the Base64 string
The full data URL is shown instantly — ready to paste anywhere.
Copy
Copy the full data URL or just the Base64 portion.
Your image stays local
FileReader runs in your browser. No upload, no server, no storage.
Common use cases
Inline images in CSS
Embed small icons and logos directly in CSS background-image properties to eliminate HTTP requests.
HTML email images
Some email clients block external images. Embed small images as Base64 data URLs to guarantee they render.
Single-file HTML pages
Create fully self-contained HTML files by embedding all images as Base64 data URLs — no external dependencies.
API image payloads
Many APIs accept images as Base64-encoded strings in JSON payloads instead of multipart form data.
Frequently asked questions
What file types are supported?
Any image format the browser can decode: PNG, JPG/JPEG, GIF, WebP, SVG, BMP, ICO.
Is there a file size limit?
Large images produce very large Base64 strings. Images over ~1MB are not recommended for inline use — the data URI becomes unwieldy. Use Base64 encoding for small images (icons, logos).
What is a data URL?
A data URL is a URI scheme that embeds file data directly: data:[mediatype];base64,[data]. Browsers treat it like a normal URL but read the data locally.
Does my image get uploaded?
No. FileReader.readAsDataURL() is a browser API that reads the file locally. Your image is never transmitted anywhere.