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Image to Base64

Free online tool to convert PNG, JPG, WebP, GIF, BMP, SVG, AVIF, and other images to Base64 Data URLs locally in your browser, with choose, drag, and Ctrl + V paste support

Image to Base64

Supported formats

JPG / PNG / WebP / GIF / BMP / SVG / AVIF

All conversion runs locally in your browser. Images and Base64 content are not uploaded.

Base64 result

Waiting for an image

Choose, drag, or press Ctrl + V to paste an image. The Base64 Data URL will appear here.

About this tool

Image to Base64 represents binary bytes with printable ASCII and can produce a data URL containing the MIME type. It is useful for embedding a very small icon in CSS, HTML, JSON, or a test fixture, but the encoded text is commonly about one-third larger than the binary file.

Base64 neither compresses nor encrypts an image. Embedding a large image expands markup or scripts, removes independent caching, and increases parsing work, so compare a normal image URL, build-time inlining, and Base64 for the real use case.

How to use it

  1. Choose an image file

    Check its format and size, and reduce unnecessary dimensions before encoding.

  2. Generate the text

    Select raw Base64 or a data URL with MIME prefix according to the destination field.

  3. Test in the destination

    Check quoting, length limits, and rendering, and make sure the receiver does not encode it again.

Supported range and limits

Output form
A Base64 string, or a complete Data URL with the data:image/...;base64, prefix
Size cost
Base64 is about 33% larger than the source file; a fixed overhead of the encoding
Input methods
Pick a file, drag one in, or paste an image straight from the clipboard
Typical use
Inlining into HTML or CSS to save a request, storing in a JSON field, embedding in an email template
Poor fit
Inlining large images bloats the HTML or CSS and prevents the browser caching them separately
Where it runs
Encoding happens in the browser; the image is never uploaded

When you would use it

  • Creating a self-contained example

    Embed a small image in an API fixture or single-file HTML document without another resource dependency.

  • Preparing an API field

    Submit raw Base64 image data and a separate MIME type when required by an endpoint.

  • Inlining a small icon into a stylesheet

    A few hundred bytes of icon as a Data URL in CSS saves a request and avoids the icon flashing in on first paint.

What to know before you start

  • Base64 is directly reversible and must not be used to conceal a sensitive image.
  • A data URL includes the `data:` scheme, MIME type, and comma prefix; a raw Base64 field usually must not include them.
  • Long strings can exceed database, form, or gateway limits, so confirm the receiver’s maximum length.

Related concepts

Base64
An encoding that represents arbitrary binary bytes with an alphabet of 64 printable characters.
data URL
A `data:` URL scheme that embeds a MIME type and encoded payload directly in the URL.

Frequently asked questions

Does Image to Base64 upload my files?
No. Images are read and encoded as Base64 locally in your browser. Files are not uploaded to a server.
Can I paste an image?
Yes. You can choose an image, drag an image in, or press Ctrl + V to paste an image from the clipboard.
Does it output raw Base64 or a Data URL?
The page shows the full Data URL by default and also provides a button to copy the raw Base64 string.
Which images can be converted to Base64?
JPG, PNG, WebP, GIF, BMP, SVG, AVIF, and other common browser-readable image formats are supported.
How large an image is worth Base64-encoding?
Generally only small icons of a few kilobytes. Base64 adds about a third to the size, and inlined data cannot be cached separately; a large inlined image means re-downloading it with every HTML or CSS fetch.
Data URL with the prefix, or a bare string?
An HTML src or a CSS url() needs the full Data URL including the data:image/png;base64, prefix. Storing in a JSON field or a database column usually uses the bare string, with the consumer adding the prefix.

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