Base64 Image Encoder

Convert images to Base64 data URIs — embed images directly in HTML and CSS

What Is Base64 Image Encoding?

Base64 image encoding converts image files (PNG, JPEG, GIF, SVG, WebP) into Base64-encoded text strings that can be embedded directly in HTML, CSS, and JavaScript source code as data URIs. Instead of referencing an external image file via URL, you embed the entire image content inline using the format: data:image/png;base64,iVBORw0KGgo... This eliminates the need for a separate HTTP request to load the image.

Data URI embedding is valuable for small icons, logos, and UI graphics where reducing HTTP requests improves page load performance. It is also useful for generating self-contained HTML documents, email templates that display without external dependencies, and single-file applications. However, Base64 encoding increases the data size by approximately 33%, so it is best suited for images under 10KB where the HTTP request overhead outweighs the size increase.

How to Convert Images to Base64

1. Click Choose File or drag and drop an image onto the upload area
2. The tool reads the image file locally in your browser and encodes it
3. Copy the complete data URI string (including the data:image/... prefix) for HTML use
4. Or copy just the Base64 string without the prefix for use in API payloads or CSS
5. Preview the encoded image to verify it displays correctly before using it

Why Use PinusX for Image Base64 Encoding?

PinusX encodes your images with 100% client-side processing. Your image files never leave your browser — they are read using the browser's File API and encoded locally using JavaScript. This is important when working with proprietary graphics, unreleased product screenshots, internal branding assets, or any images containing confidential information. In November 2025, jsonformatter.org leaked over 80,000 user credentials processed on their servers. PinusX prevents this class of data exposure by keeping all processing local. Your images are encoded and displayed entirely within your browser tab.

Frequently Asked Questions

Which image formats are supported?

The encoder supports PNG, JPEG, GIF, SVG, WebP, BMP, ICO, and TIFF formats. The most common formats for data URI embedding are PNG (for graphics with transparency), JPEG (for photographs), and SVG (for vector graphics). SVG files can also be URL-encoded instead of Base64-encoded for even better efficiency.

When should I use Base64 images vs regular image files?

Use Base64 data URIs for small images (under 10KB) like icons, small logos, and UI elements where eliminating an HTTP request speeds up loading. For larger images, regular file references are better because Base64 increases size by 33% and prevents browser caching. Large Base64 strings also bloat your HTML/CSS files.

Can I use Base64 images in CSS?

Yes. Use the data URI in CSS background-image properties: background-image: url('data:image/png;base64,...'). This is especially useful for small repeating patterns, icons, and sprites in CSS where you want to avoid additional HTTP requests for styling resources.

Does Base64 encoding affect image quality?

No. Base64 is a lossless encoding — it converts the exact bytes of the image file without any quality loss or recompression. The decoded image is byte-for-byte identical to the original file. Image quality depends on the original format and compression, not on Base64 encoding.

What is the maximum image size I can encode?

Since encoding runs in your browser, the practical limit depends on your device's available memory. Most modern devices handle images up to 10-20MB without issues. However, for data URI embedding, images over 10KB are generally better served as separate files. Very large Base64 strings can cause performance issues in HTML rendering.

Your data never leaves your browser. 100% client-side processing.