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Image to Base64 Converter

Convert any image to a Base64 data URL for use in HTML, CSS, JSON, or code — no upload required.

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Drop an image here

or click to browse — PNG, JPG, GIF, WebP, SVG

About Image to Base64 Converter

Free online image to Base64 converter that works entirely in your browser — no server uploads, no signup. Upload any PNG, JPG, WebP, GIF, or SVG image and instantly get the Base64-encoded data URL. Choose your output format: a full data URL (data:image/png;base64,...), raw Base64 string, CSS background-image rule, or an HTML <img> tag ready to paste. The tool also shows the original file size, encoded string size, and the size overhead so you know exactly what you're embedding. Ideal for embedding small icons in CSS, creating self-contained HTML pages, storing images in JSON APIs, or testing image rendering without a web server.

Frequently Asked Questions

What is a Base64 image and why use it?▾

Base64 encoding converts binary image data into a text string that can be safely embedded directly in HTML, CSS, or JSON without needing a separate file. It's useful for small icons, email templates, self-contained HTML files, and scenarios where you want to avoid an extra HTTP request.

What output formats does this tool provide?▾

Four formats: (1) Data URL — the full data:image/png;base64,... string ready to use in an <img src>. (2) Base64 Only — just the encoded string, useful for APIs. (3) CSS Background — a ready-to-paste background-image rule. (4) HTML <img> — a complete img tag with the data URL as the src.

Does Base64 make the image file larger?▾

Yes, Base64 encoding increases the data size by roughly 33%. The tool shows you both the original file size and the encoded size so you can decide whether embedding makes sense versus using a separate file.

Is my image uploaded to a server?▾

No. The conversion happens entirely in your browser using the FileReader API. Your image never leaves your device.

What image formats are supported?▾

Any image format your browser can display: PNG, JPG/JPEG, WebP, GIF, SVG, BMP, AVIF, and more. The output data URL preserves the original MIME type.

Can I use this for large images?▾

Technically yes, but Base64 encoding large images is generally not recommended — a 500 KB image becomes ~670 KB of text, which can bloat your HTML or CSS and slow down page loads. Base64 is best suited for small images under ~10 KB.

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