Image to Base64
Convert images to Base64 encoding
100% free. Runs entirely in your browser - your files and data never leave your device and nothing is uploaded to any server.
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Supports PNG, JPG, WebP, GIF, SVG
Processed in your browser - your file never leaves this device.
About this tool
Base64 encoding turns an image's binary data into a plain text string that can be embedded directly inside HTML, CSS, or JSON - no separate image file needed. This is common for small icons/logos embedded inline in code, email templates, or data URIs where fetching a separate file isn't practical.
How to use this tool
- Upload image fileSelect the image you want to embed as text.
- Generate Base64 stringConvert binary image bytes into Base64 output instantly.
- Copy data URI formatUse the provided `data:image/...;base64,` string for HTML/CSS/JSON embedding.
- Test in target appPaste into your code and verify rendering in browser/email/client.
How to use a Base64 image in HTML and CSS
In HTML, put the data URI in the src attribute: <img src="data:image/png;base64,...">. In CSS, use it as a background: background-image: url("data:image/png;base64,..."). The image then loads with the page itself, with no extra request.
Base64 makes the image about a third larger and it cannot be cached separately, so keep it for small icons and logos - under a few kilobytes. Larger images are better served as normal files.
Key features
- Embeds small assets directly into source code without separate files.
- Useful for email templates and single-file HTML prototypes.
- Eliminates extra HTTP requests for tiny icons.
- Quick conversion with copy-ready output.
Common uses
- Inlining logos in transactional email templates.
- Embedding icons in CSS backgrounds or SVG payloads.
- Passing image content through JSON APIs as text.
- Creating self-contained demo HTML files.
Tips for better results
- Use Base64 mainly for small files such as icons and badges.
- Keep original file for caching-efficient production delivery.
- Validate MIME type prefix matches the real image format.
- Measure bundle size impact before large-scale inlining.
Mistakes to avoid
- Embedding large photos and bloating HTML/CSS payloads.
- Forgetting the `data:` prefix and breaking image rendering.
- Assuming Base64 improves quality or compression.
- Using Base64 everywhere instead of leveraging browser caching.
Frequently asked questions
Yes - Base64 text representation is roughly 33% larger than the original binary file, which is a normal tradeoff for embedding it as text.
Paste it into a data URI like <code>data:image/png;base64,...</code> and use that directly as an <code>src</code> or CSS <code>background-image</code> value in place of a normal image file path.
Base64 embedding works best for small icons/logos. Large images become large text blobs that bloat your HTML/CSS file and lose caching benefits a separate image file would have.
In HTML, put the whole data: string (data:image/png;base64,...) in an image tag's src attribute; in CSS, use background-image: url(data:image/png;base64,...). The data: prefix must match the image type.
Support is patchy - several major clients, including Gmail, do not display data: URI images. For email, host the image and link to it, or attach it with a content ID.
For tiny icons and placeholders, embedding saves an extra request. For anything larger than a few kilobytes, a normal image file is better because browsers can cache it separately.