What is a Base64 image?

A Base64 image is a binary image file encoded as a text string using Base64 encoding. This allows images to be embedded directly in HTML, CSS, JavaScript, or JSON without referencing an external file. The format is: data:image/png;base64,iVBORw0KGgoAAAANS...

How do I use a Base64 image in CSS?

Use the data URI as the value of background-image: .element { background-image: url("data:image/png;base64,iVBOR..."); }. This embeds the image directly in your CSS without an external HTTP request.

When should I use Base64 images?

Base64 is ideal for small images (icons, sprites, data URIs) that you want to inline in HTML/CSS to save HTTP requests. Avoid it for large images — Base64 encoding increases file size by ~33%, and large inline images block HTML parsing.

Is this tool safe for confidential images?

Yes. This converter runs entirely in your browser using the FileReader API. No image is uploaded to any server. Your files never leave your device.

All tools

🖼️

Image to Base64 Converter

Convert PNG, JPG, SVG, GIF and WebP to Base64 data URIs — CSS, HTML, and raw formats

100% in-browserPNG · JPG · SVG · GIFCSS & HTML outputAI API formatBrowser-only

Try samples:

Drop your image here

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

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Upload an image on the left to see the Base64 output — Data URI, CSS, HTML, and raw formats

Image to Base64 — Embed Images Directly in HTML and CSS

Base64 encoding converts a binary image file into a text string that can be embedded directly in HTML, CSS, JavaScript, or JSON — no external image file needed. The resulting data URI starts with data:image/png;base64, followed by the encoded string. Browsers decode and display it identically to a regular external image.

This is useful for small icons, inline CSS backgrounds, email HTML (which blocks external images), and eliminating extra HTTP requests. Upload any PNG, JPG, SVG, GIF, or WebP image and instantly get the Base64 data URI, a ready-to-paste CSS background-image rule, an HTML <img> tag with the Base64 src, and the raw encoded string — all with one-click copy. Your image is never uploaded to a server.

How it works

Convert Image to Base64 in 30 Seconds

Drop or select

Drag and drop your image file onto the tool, or click to browse. PNG, JPG, SVG, GIF, WebP all supported.

Instant preview

See a live preview of your image with file name, type, dimensions, original size, and Base64 size.

Choose format

Pick from Data URI, CSS background-image, HTML img tag, or raw Base64 string.

Copy and use

One click copies the selected format to your clipboard. Paste directly into your CSS, HTML, or JS.

Use cases

When Developers Convert Images to Base64

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HTML email images

Email clients often block external images. Inline Base64 images display reliably in all email clients.

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CSS background icons

Embed small icons, patterns, and textures directly in your CSS as data URIs — no HTTP request.

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Eliminate HTTP requests

Inline critical small images (logo, icons) to avoid extra round-trips on first load.

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Self-contained components

Build React/Vue components that bundle their own images without depending on a public URL.

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AI and API payloads

Many vision AI APIs (OpenAI, Claude) accept images as Base64 strings in JSON request bodies.

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Testing and mocking

Use Base64 images as reliable test fixtures that never break due to missing files or URLs.

FAQ

Frequently Asked Questions

1Does Base64 make images larger?

Yes. Base64 encoding increases file size by approximately 33% compared to the binary original. This is a trade-off: you eliminate one HTTP request but pay with increased data transfer. For images smaller than ~5KB, the request overhead usually outweighs the size penalty. For large images, use regular external URLs.

2How do I use a Base64 image in an <img> tag?

Set the src attribute to the full data URI: <img src="data:image/png;base64,iVBORw0KGgoAAAA..." alt="My image">. This generator produces the complete img tag ready to copy and paste.

3Can I use a Base64 SVG in CSS?

Yes. SVG can be encoded as Base64 or as a URL-encoded SVG string (which is smaller). Example: background-image: url("data:image/svg+xml;base64,PHN2Zy4uLg=="). This tool outputs Base64 for all image types including SVG.

4What image types are supported?

PNG, JPG/JPEG, GIF, WebP, SVG, BMP, ICO, TIFF, and any other image format your browser supports. The tool uses the browser's built-in FileReader API to read and encode the file.

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