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ToolNest AI
Free

Image to Base64

Convert images to Base64 strings instantly for use in HTML, CSS, JavaScript and APIs.

code

Drag & drop an image here

or click to browse — JPG, PNG, WebP, GIF, BMP, AVIF, SVG · any size

Base64Data URIHTML imgCSS bgMarkdownBrowser-local

Common use cases

code

Inline HTML / CSS

Embed images without extra HTTP requests

api

API payloads

Send images inside JSON without a CDN

email

Email templates

Portable images that travel with the email

About Image to Base64

Upload any image and instantly get the Base64 string, Data URI, HTML img tag, CSS background-image declaration and Markdown image syntax — all ready to copy with one click. Supports JPG, PNG, WebP, GIF, BMP, TIFF, AVIF and SVG. Shows original file size, Base64 length and the exact size-increase percentage. Everything runs client-side; your image is never uploaded to any server.

Frequently Asked Questions

Base64 is an encoding scheme that converts binary data (like an image file) into a string of ASCII characters. This lets binary data be embedded directly inside text-based files such as HTML, CSS, JSON or email.

Embedding images as Base64 removes the need for a separate HTTP request to load the image, which can speed up small pages or allow images to be stored inside JSON payloads and API responses.

A Data URI is a complete, self-contained URL that embeds file data directly — for example: data:image/png;base64,iVBOR…. You can paste it into an src or background-image attribute and the browser renders the image without any network request.

Yes, completely. The browser's built-in FileReader API encodes the image. Your image is never uploaded to any server.

Yes, fully free with no account required and no usage limits.

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