Image to Base64
Convert an image into a Base64 data URI you can paste straight into CSS or HTML. Free and fully in-browser.
Drop an image here
or click to choose · encoded right in your browser
How to use the Image to Base64
- 1Drag an image onto the drop zone, click to browse your files, or paste an image straight from your clipboard — PNG, JPEG, GIF, WebP, SVG, and ICO are all accepted.
- 2Wait a moment while the tool reads the file's bytes in your browser and encodes them; the live preview thumbnail confirms it grabbed the right image.
- 3Check the detected MIME type and file size shown next to the output so you know the data URI header (for example data:image/png;base64) is correct.
- 4Choose your output format using the tabs: the raw Base64 string, a full data URI, a ready-made CSS background-image rule, or an HTML img tag.
- 5Click Copy to send the selected snippet to your clipboard, or use Download to save the string as a text file.
- 6Paste it directly into your stylesheet, HTML, email template, or code, and reload to verify the inlined image renders.
About the Image to Base64
Image to Base64 turns any image file into a Base64-encoded data URI — a long text string beginning with something like data:image/png;base64,iVBOR... — that represents the entire image as characters instead of a separate file. You drop in a PNG, JPEG, GIF, WebP, SVG, or ICO, and the tool reads the raw bytes and re-encodes them using the standard Base64 alphabet, then prepends the correct MIME type so browsers know how to render it. Everything happens locally through the FileReader and Canvas APIs in your own browser; the image bytes never leave your machine, so there is no upload, no server round-trip, and no size limit imposed by a backend beyond what your device's memory can hold.
The most common reason people reach for this is to inline small assets. Embedding an icon, a texture, or a placeholder image directly in CSS (background-image: url(data:...)) or in an HTML img src eliminates an extra HTTP request, which can shave real milliseconds off first paint for above-the-fold graphics. It's handy for email templates where external images get blocked, for self-contained HTML files you email or archive, for bundling a favicon or logo into a single-file component, and for embedding sample images in Markdown, JSON payloads, or API fixtures where you can't reference a URL.
Front-end developers, email designers, and anyone building demos or documentation benefit most. A practical tip: Base64 inflates size by roughly 33%, so this pays off for small assets (a few KB) and hurts for large photos, which are better served as normal cached files. Also remember data URIs aren't cached separately by the browser, so an image inlined on ten pages downloads ten times. For SVGs, consider that the output can often be shortened with URL-encoding instead of Base64. The tool typically shows you the ready-to-paste CSS and HTML snippets alongside the raw string, plus a live preview so you can confirm the encoding rendered the exact image you expected before you copy it into your project.
Frequently asked questions
Why is my Base64 string bigger than the original image file?
Base64 represents every 3 bytes of binary data as 4 text characters, so the encoded output is about 33% larger than the source file. That overhead is normal and unavoidable — it's the cost of expressing binary data in a text-safe alphabet. This is why inlining makes sense for small assets but not for large photos, where a regular cached image file stays smaller over the wire.
Do I need to include the data:image/...;base64, prefix or just the raw string?
It depends on where you're pasting. For CSS background-image, an HTML img src, or an email template, you need the full data URI including the data:image/png;base64, prefix so the browser knows the MIME type and encoding. If you're storing the value in a database or passing it to a function that adds the header itself, you may only want the raw Base64 part. The tool gives you both so you can copy whichever you need.
Are my images uploaded anywhere when I convert them?
No. The conversion runs entirely in your browser using the FileReader API. The image bytes are read and encoded on your own device and are never sent to any server, so it's safe to use with private screenshots, internal logos, or confidential mockups. You can even disconnect from the internet after the page loads and it will still work.
Can I inline an SVG this way, and is Base64 the best choice for it?
Yes, SVG files encode fine and you'll get a data:image/svg+xml;base64 string. However, because SVG is already text, URL-encoding it (percent-encoding) instead of Base64 often produces a smaller, more readable result and avoids the 33% penalty. For raster formats like PNG and JPEG, Base64 is the standard and correct choice.
Will inlined Base64 images hurt my page's caching or performance?
They can if overused. A data URI is embedded in the HTML or CSS itself, so it isn't cached as a separate resource — if the same inlined image appears on multiple pages, it's re-downloaded with each page rather than served once from cache. Inlining is best for tiny, page-specific assets where saving an HTTP request outweighs losing separate caching. For images reused across a site, a normal cached file is usually faster overall.
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Frequently asked questions
What do I get?+
A data URI string plus ready-to-use CSS and HTML snippets.