sprytools

Image to Base64 Converter

Convert any image (PNG, JPG, GIF, WebP, SVG) to Base64 or a Data-URL instantly. 100% client-side — no upload, no server. Decode Data-URLs back to images. Copy HTML img-tag and CSS snippets.

Drop image here or click to choose PNG, JPG, GIF, WebP, SVG

Did we solve your problem today?

What Is an Image to Base64 Converter?

An Image to Base64 Converter transforms binary image files into a Base64-encoded text string that can be embedded directly in HTML, CSS, or JavaScript — no separate file needed. This tool runs entirely in your browser using the built-in FileReader API. Your images are never uploaded to any server.

How to Convert an Image to Base64

  1. Drop or select a PNG, JPG, GIF, WebP, or SVG file using the upload area
  2. Choose your output format: Data URL (includes the data:image/…;base64, prefix) or Base64 only (the raw string)
  3. Copy the result to clipboard, or grab the ready-to-use HTML <img> tag or CSS background-image snippet

Encoding Output Formats

FormatExampleWhen to Use
Data URLdata:image/png;base64,iVBOR…Embed in HTML src, CSS url(), JSON
Base64 onlyiVBOR…APIs that expect raw Base64, custom data: assembly
HTML <img><img src="data:…" alt="" />Inline image in HTML without a separate file
CSS backgroundbackground-image: url("data:…");CSS inline background, no image file required

Decoding a Data URL Back to an Image

Switch to the Decode tab, paste a complete Data URL (starting with data:image/…;base64,…), and click Decode. The image renders immediately for preview, and a Download button lets you save it as a file.

File Size and the 1 MB Warning

Base64 encoding increases file size by approximately 33% — a 100 KB PNG becomes ~133 KB as Base64. Embedding large images as Data URLs is technically valid but has drawbacks:

The tool warns when the source image exceeds 1 MB. For images above this threshold, a traditional <img src="image.png"> with proper HTTP caching is almost always the better choice.

Supported Formats

Privacy

All processing happens locally in your browser. No image data, file names, or metadata are transmitted to any server. Closing or refreshing the page clears everything immediately.

FAQ

What is a Base64 image?

A Base64 image is a binary image file encoded as a string of printable ASCII characters. It can be embedded directly in HTML (as a data URI in an <img> src attribute), CSS (background-image), or JSON — eliminating a separate HTTP request for small images. The trade-off is that Base64 encoding increases file size by ~33%.

What is a Data URL?

A Data URL (or data URI) is a URI scheme that embeds file content inline, using the format: data:<mime-type>;base64,<base64-data>. For example: data:image/png;base64,iVBORw0KGgo…. Browsers can render Data URLs directly as image sources without a network request.

Is my image uploaded to a server?

No. This tool uses the browser's FileReader API to read and convert your image entirely on your device. Nothing is sent to any server. Your image data stays private.

What image formats are supported?

PNG, JPG/JPEG, GIF, WebP, and SVG are supported. These cover the most common web image formats. SVG files, while text-based, can also be Base64-encoded for embedding in CSS or HTML.

Why does Base64 output look larger than the original file?

Base64 encoding represents every 3 bytes of binary data as 4 ASCII characters, increasing size by approximately 33%. A 100 KB PNG becomes roughly 133 KB as Base64. This is expected — the tool shows both the original and encoded sizes so you can judge the trade-off.

What is the 1 MB warning about?

Large Base64 strings embedded in HTML or CSS can slow down page parsing and inflate HTML document size significantly. The 1 MB warning is a practical guideline: images above this threshold are usually better served as separate files with a regular <img src="url"> rather than as inline Data URLs.