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.
About Image to Base64
The Image to Base64 tool converts an image into a data URI — a text string starting with "data:image/…;base64," that embeds the whole image. Paste it into HTML, CSS or JSON to ship an image without hosting a separate file.
A data URI contains the media type and encoded bytes in one value, which can be convenient for tiny self-contained assets. The result is encoding rather than compression or encryption: anyone who receives the string can decode and view the original image, and the text is normally larger than the binary file.
Ready-to-paste HTML <img> and CSS background-image snippets are generated alongside the raw string. Encoding runs in your browser, and a size warning helps identify files that are poor candidates for embedding.
How Image to Base64 works in practice
- 1Upload the image to encode (PNG, JPG, GIF, WebP or SVG).
- 2Copy the generated data URI, or the ready-made HTML / CSS snippet.
- 3Paste it into your source code or JSON payload.
Jobs this tool is built for
- Embed a tiny icon in a self-contained HTML prototype that must work without separate asset files.
- Place a small background image directly in CSS for an email or portable demo.
- Include an image value in a JSON payload for an API that explicitly expects a data URI.
- Generate a copyable representation of a small test image for documentation or development fixtures.
What you can do here
- One-click Base64 generation
- HTML <img> and CSS background-image snippet copy
- Supports PNG, JPG, GIF, WebP and SVG
- File-size warning for oversized inputs
Limits and honest caveats
- Base64 inflates file size by about 33% — keep it to small icons and thumbnails (under ~20 KB). Large images should be served as normal files.
- Base64 is not encryption and does not hide sensitive image contents.
- Embedded images cannot be cached independently from the HTML, CSS or other file that contains them.
- Encoding is local in the browser, so the source image is not uploaded.
Common questions about Image to Base64
Can I decode a Base64 string back into an image?
Yes — paste the data URI into a browser address bar to view and save it.
Does the browser cache Base64 images?
Not individually — they are cached only as part of the file that contains them.
Why is the Base64 text larger than my image?
Base64 represents binary data using text characters and adds roughly one-third overhead, plus the short data-URI prefix.
Is Base64 safe for private images?
It is not a security measure. The conversion is local, but anyone with the resulting string can decode it back into the image.
This page was written by the ToolSink team to explain how Image to Base64 works on this site — it is not syndicated, scraped, or spun from another publisher. How we write tool guides · Site updates · About ToolSink.
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