Image to Base64 Converter
Convert an image into a Base64-encoded string or data URI, ready to paste into HTML or CSS, entirely inside your browser.
What is image-to-Base64 conversion?
Base64 encoding turns an image's raw bytes into plain text, which can then be embedded directly inside HTML, CSS, or JSON instead of linking to a separate image file. With the data URI prefix included, the output can be dropped straight into an <img> tag's src attribute or a CSS background-image.
GuideHow to use it
Features & benefits
Why this runs entirely in your browser
Images and Base64 data handled here can be personal photos or unreleased design assets, so nothing is uploaded to a server. Everything is processed locally in the tab using the browser's own file reading and image rendering, which means it keeps working offline once the page has loaded.
A note on Base64 image size
Base64 encoding increases the size of the data by roughly a third compared to the original binary file, since every three raw bytes become four text characters. That trade-off is worth it for small icons embedded inline, but for larger images a normal image file with a proper URL is usually the better choice for page load performance.
Frequently asked questions
A few things people usually want to know before trusting the numbers.
It adds the data:<mime-type>;base64, header, making the string usable directly as an image source in HTML or CSS. Turning it off leaves just the raw Base64 payload.
Base64 encoding increases size by about a third, since every three bytes of the original file become four text characters.
PNG, JPEG, GIF, WEBP, and SVG can all be uploaded and encoded.
Yes — switch to the Base64 to Image tab, or use the dedicated Base64 to Image Converter page.
No. All encoding happens locally in your browser. Nothing uploaded here is sent to a server, stored, or shared.