ToolSink

Image to Base64

Convert any image (PNG, JPG, WebP, GIF, SVG) into a Base64 data URI you can embed directly into HTML, CSS or JSON. 100% local.

What is the Image to Base64?

The Image to Base64 tool converts any image into a Base64 data URI — a long string that starts with "data:image/…;base64," and represents the entire image as text. You can paste the string into HTML, CSS or JSON to embed an image directly, without hosting the file separately.

Developers reach for Base64 when they want to inline small icons in a CSS file, ship a single-file HTML report, or pass an image through a system that only accepts text (such as a JSON API). The tool is a common step in prototyping, testing and shipping quick demos.

Everything runs in your browser, so proprietary assets like company logos or unreleased artwork never travel through a third-party server.

How to use the Image to Base64

  1. 1Upload the image you want to encode (PNG, JPG, GIF, WebP or SVG).
  2. 2Wait a moment for the browser to read the file.
  3. 3Copy the generated data URI, or copy the ready-to-paste HTML or CSS snippet.
  4. 4Paste the Base64 string into your source code, JSON payload or clipboard-friendly destination.
  5. 5Optionally download the string as a .txt file for later use.

Key features

  • One-click Base64 generation
  • HTML `<img>` snippet copy
  • CSS `background-image: url(...)` snippet copy
  • JSON string copy for API payloads
  • Supports PNG, JPG, GIF, WebP and SVG
  • File size warning for oversized inputs
  • Runs entirely offline

Examples

Inline logo in an email template

Paste the Base64 string into a `<img src="…">` tag so the logo travels with the HTML email.

CSS background icon

Embed a tiny 24×24 icon into your stylesheet to avoid a separate HTTP request.

API test payload

Send an image inline inside a JSON body to test an upload endpoint from Postman.

Why use this tool

  • Bundles image and code into a single file
  • Avoids CORS issues that plague hotlinked images
  • Works offline once encoded
  • Handy for quick prototypes and one-off demos
  • Fast copy-paste with ready-made HTML/CSS snippets

Common use cases

  • Embedding icons inside a CSS file
  • Shipping a self-contained HTML report
  • Testing an image upload API with Postman or cURL
  • Storing tiny thumbnails inside a JSON database
  • Attaching an image to a Chrome extension
  • Sending inline images inside HTML emails

Frequently asked questions

Should I Base64-encode large images?

No. Base64 inflates size by ~33%. Keep it to small icons and thumbnails (under 20 KB).

Does the browser cache Base64 images?

Not individually — they are cached only as part of the file that contains them.

Can I decode a Base64 string back into an image?

Yes. Paste the string into a browser address bar or use a decode tool. We plan to add a decoder soon.

Is SVG supported?

Yes. SVG is text already, but the tool wraps it in a data URI ready for CSS.

Is my image sent anywhere?

No. Encoding happens entirely in the browser.