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Image to Base64 Converter

Client-side only

Convert images (PNG, JPG, GIF, WebP, SVG) to Base64 data URIs instantly. Perfect for embedding images in HTML, CSS, or JSON. All processing happens in your browser.

Drag & drop your image here, or click to browse

PNG, JPG, GIF, WebP, SVG supported

What is Image to Base64 Conversion?

Image to Base64 conversion transforms image files (PNG, JPG, GIF, WebP, SVG) into Base64-encoded text strings. This allows you to embed images directly in HTML, CSS, or JSON without requiring separate image files or HTTP requests.

A data URI (data URL) is a complete Base64 image representation that includes the MIME type: data:image/png;base64,iVBORw0KG.... Browsers can render data URIs directly in <img> tags or CSS background-image properties.

This tool converts your images entirely in your browser using JavaScript's FileReader API. Your images never leave your device — no uploads, no server processing, complete privacy.

How to Use This Tool

  1. Drag and drop an image onto the upload area, or click to browse and select a file.
  2. Your image will appear in the preview section immediately.
  3. Choose Data URI (includes data:image/... prefix) or Raw Base64 (just the encoded string).
  4. Click Copy to copy the output to your clipboard, or Download .txt to save it as a text file.
  5. Paste the data URI directly into HTML src attributes, CSS url() properties, or JSON fields.
  6. Click Clear to reset and convert another image.

Common Use Cases

Embed Images in HTML

Use data URIs in <img> tags to eliminate HTTP requests for small icons and logos: <img src="data:image/png;base64,...">.

Inline CSS Background Images

Embed images in CSS to reduce page load dependencies: background-image: url(data:image/svg+xml;base64,...).

Store Images in JSON/LocalStorage

JSON doesn't support binary data. Base64-encode images to store them in JSON APIs, MongoDB, or browser localStorage.

Email HTML Templates

Embed images in HTML emails to ensure they display without relying on external image hosting.

Reduce HTTP Requests

For tiny images (icons, bullets, badges), embedding as Base64 eliminates extra HTTP round-trips and speeds up page load.

Offline Web Apps

Package all images as Base64 in your HTML/CSS to create fully self-contained offline-capable web pages.

Frequently Asked Questions

What image formats are supported? ▾

All common web image formats work: PNG, JPG/JPEG, GIF, WebP, SVG, BMP, and ICO. The browser's FileReader API handles the conversion, so any image format your browser can display will work.

Is there a file size limit? ▾

No hard limit. However, very large images (>1-2 MB) will produce extremely long Base64 strings that may slow down your browser or cause performance issues when embedded in HTML/CSS. For large images, consider hosting them normally.

Should I use data URIs for all images? ▾

No. Data URIs are best for small images (<10 KB) like icons and logos. Large images increase HTML/CSS file size, prevent browser caching, and hurt performance. Use regular <img> tags with src URLs for photos and large graphics.

What's the difference between Data URI and Raw Base64? ▾

Data URI includes the full data:image/png;base64, prefix and can be used directly in HTML/CSS. Raw Base64 is just the encoded string — useful if you're building the data URI yourself or storing the value in a database.

Are my images uploaded to a server? ▾

No. All conversion happens in your browser using JavaScript. Your images never leave your device. This tool works completely offline once the page is loaded.

How much larger is a Base64 image vs the original? ▾

Base64 encoding increases file size by approximately 33%. A 10 KB image becomes roughly 13.3 KB as Base64. The data URI prefix adds a few extra bytes.

Want to learn more? Read our guide: How to Embed Images in HTML Using Base64 Data URIs

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