How do I convert an image to Base64 online?

Drag and drop your image onto the upload area above, or click to select a file. The tool instantly encodes it to a Base64 string with a data URI prefix. Click Copy Base64 to copy the result, or Download as TXT to save it. No file is ever uploaded to any server.

How do I use a Base64 image in HTML?

Copy the full Base64 output (including the data URI prefix like data:image/png;base64,...) and paste it directly into an HTML img tag as the src attribute: . This embeds the image inline in your HTML without needing an external file.

How do I use a Base64 image in CSS?

Paste the full Base64 data URI into a CSS background-image property: background-image: url('data:image/png;base64,...'). This technique is commonly used for small icons, patterns and sprites to eliminate HTTP requests.

What image formats can I convert to Base64?

This Base64 image encoder supports PNG, JPG/JPEG, GIF, WebP, BMP, ICO and SVG formats. The tool automatically detects the format and generates the correct data URI prefix (e.g. data:image/png;base64, or data:image/jpeg;base64,).

Is this image to Base64 converter safe?

Yes. This is a client-side image to Base64 encoder — your image is read locally using the FileReader API and encoded entirely in your browser. The image file is never uploaded to any server, stored anywhere, or shared with any third party. It works offline once the page is loaded.

Image to Base64 Converter Online Free

The fastest image to Base64 converter — drag and drop any PNG, JPG, GIF or WebP image and instantly get a Base64 encoded string with full data URI output. Our client-side Base64 image encoder works entirely in your browser. No uploads, no account, 100% private.
PNG to Base64 · JPG to Base64 · Data URI Generator · Free · Works Offline

Drag & Drop Image Here

Supports PNG, JPG, GIF, WebP, BMP, SVG — max 10 MB

Image Preview

Base64 Output

Image Information

Filename—

Format—

Dimensions—

File Size—

Base64 Length—

Data URI Size—

How It Works

1. Drop Your Image

Drag and drop PNG, JPG, GIF or WebP — or click to browse. Max 10 MB, any format.

2. Encode Locally

The FileReader API encodes your image to Base64 entirely in your browser — no upload.

3. Choose Format

Select Data URI, Raw Base64, HTML <img> tag or CSS url() output format.

4. Copy or Download

Copy the Base64 string to clipboard or download it as a TXT file for your project.

What Is an Image to Base64 Converter?

An image to Base64 converter transforms the binary data of an image file into a Base64-encoded ASCII string. Base64 is an encoding scheme that represents binary data — like the bytes of a PNG or JPG image — using only printable text characters, making it safe to embed in HTML, CSS, JSON, XML and other text-based formats without needing a separate image file or HTTP request.

Our online image to Base64 converter uses the browser's built-in FileReader API to encode your image entirely on your device. This makes it a true client-side image to Base64 encoder — your image is never uploaded to any server, making it the most private Base64 image encoder online available.

Supported Image Formats

PNGPNG to Base64

JPG / JPEGJPG to Base64

GIFGIF to Base64

WebPWebP to Base64

BMPBMP to Base64

SVGSVG to Base64

ICOICO to Base64

The encoder automatically detects the image MIME type and generates the correct data URI prefix — for example data:image/png;base64, for PNG files and data:image/jpeg;base64, for JPG files.

How to Use Base64 Images in HTML and CSS

Once you have your Base64 string, this Base64 data URI generator provides four ready-to-use output formats:

Base64 Image Encoder for HTML img src

Use the Base64 image encoder for HTML img src format to embed an image directly in your HTML without any external file. Paste the full data URI as the src attribute:

<img src="data:image/png;base64,iVBORw0KGgo..." alt="My image"/>

Base64 Image for CSS background-image

Use the CSS output to set a Base64 image for CSS background-image, eliminating an HTTP request for small icons, patterns or sprites:

.icon {
  background-image: url('data:image/png;base64,iVBORw0KGgo...');
}

Raw Base64 String for JavaScript and APIs

Use the Raw Base64 output (without the data URI prefix) when working with APIs or JavaScript that expects a plain Base64 string — for example when uploading to a REST API or storing in a database field.

// Fetch the raw Base64 string:
const base64 = "iVBORw0KGgoAAAANSUhEUgAA...";
const dataURI = `data:image/png;base64,${base64}`;

When to Use Base64 Images

Small icons and sprites: Embedding tiny images as Base64 eliminates an HTTP request, improving page load speed — ideal for icons under 2–3 KB.
Email templates: Inline Base64 images in HTML emails ensure images display even when the email client blocks external image loading.
Offline-first web apps: Base64 images can be stored in localStorage or IndexedDB and displayed without any network connection.
API payloads: Sending images as Base64 strings in JSON is simpler than multipart/form-data for many REST and GraphQL APIs.
Single-file HTML documents: Convert all assets to Base64 to create a fully self-contained HTML file with no external dependencies.

Common Uses for a Base64 Image Converter

Our Base64 image generator is used by web developers, designers and content creators for many workflows:

Front-end development: Convert small UI icons, logos and button images to Base64 for use in CSS or inline HTML — reducing HTTP requests and improving Core Web Vitals scores.
Email marketing: Most email clients block external images by default. Embedding images as Base64 data URIs ensures they always display.
Favicon encoding: Convert .ico or PNG favicons to Base64 for use in <link rel="icon" href="data:image/..."> tags in single-page applications.
Mobile and React Native development: Pass images as Base64 strings through props or state without managing local file paths.
Data URIs in SVG: Embed raster images inside SVG files using Base64 data URIs in <image xlink:href="data:..."> elements.
PDF generation: Many PDF libraries (jsPDF, PDFKit) accept Base64 image strings directly for embedding images in programmatically generated PDFs.

image to Base64 image to Base64 converter convert image to Base64 Base64 image encoder Base64 image converter Base64 encode image Base64 image generator PNG to Base64 JPG to Base64 convert image to Base64 string Base64 data URI generator online image to Base64 converter Base64 image encoder for HTML img src Base64 image for CSS background-image

Frequently Asked Questions

An image to Base64 converter encodes the binary bytes of an image file into a Base64 ASCII string. The result — called a data URI when prefixed with data:image/png;base64, — can be embedded directly in HTML, CSS and JSON without needing a separate image file or any server request.

Drag and drop your image onto the upload area above, or click Select Image. The tool instantly encodes it to a Base64 string. Choose your output format (Data URI, Raw Base64, HTML <img> or CSS url()) and click Copy Base64. All encoding happens in your browser — no file is ever uploaded.

Select the HTML <img> output tab to get a ready-to-paste <img> tag with the Base64 data URI as the src. This is the standard way to use a Base64 image encoder for HTML img src. The image displays inline in the HTML without any external file dependency.

Select the CSS url() output tab to get the Base64 string formatted as a CSS background-image: url(...) value. This is the standard approach for using a Base64 image for CSS background-image — ideal for small icons and patterns to reduce HTTP requests.

This Base64 image encoder online supports PNG, JPG/JPEG, GIF, WebP, BMP, ICO and SVG. The MIME type is detected automatically, so the correct data URI prefix is generated for each format — data:image/png;base64, for PNG, data:image/jpeg;base64, for JPG, and so on.

Yes on both counts. This convert image to Base64 online free tool has no registration, no usage limits and no watermarks. It is also completely safe — your image is encoded using the browser's FileReader API with zero server communication. Your image file never leaves your device.