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Image Tools

Free Image to Base64 Converter

Encode images to a Base64 string, or decode a Base64 string back into a downloadable image — entirely in your browser. Nothing is ever uploaded to a server.

What is Base64 Image Encoding?

Base64 is a text encoding scheme that represents binary data — like an image file — as a string made up of letters, numbers, and a few symbols. Encoding an image to Base64 lets you embed it directly inside HTML, CSS, or JSON without linking to a separate file, which is handy for small icons, inline email images, or CSS background images that need to travel as a single self-contained block of text. The resulting string is typically wrapped in a "data URL" like data:image/png;base64,... so browsers know how to decode and render it. This tool converts in both directions: upload an image to get its Base64 string, or paste a Base64 string (with or without the data URL prefix) to preview and download the original image. Everything happens locally using the browser's built-in FileReader API — your images and strings are never sent anywhere.

How to Use the Image to Base64 Converter

  1. Choose the "Image to Base64" or "Base64 to Image" tab depending on what you need.
  2. To encode, drag and drop a JPG, PNG, WebP, GIF, or SVG file into the upload area.
  3. Copy the generated Base64 string or download it as a .txt file.
  4. To decode, paste a full data URL or a raw Base64 string into the text box.
  5. Review the live image preview, then click Download image to save the result.

When to Use an Image to Base64 Converter

  • Frontend developers inlining small icons or sprites directly into CSS or HTML to save an extra network request.
  • Email developers embedding logo or signature images that need to render without loading external assets.
  • Students and self-taught coders learning how data URLs work while building their first web pages.
  • API developers who need to send an image as a JSON string field instead of a binary file upload.
  • Designers testing how a favicon or logo looks as an inline data URL before shipping it to production.
  • Anyone decoding a Base64 string from an API response or a code snippet who just needs to see and save the actual image.

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Frequently Asked Questions

Yes, it's 100% free with no signup, no watermark, and no limit on how many images you convert.

No. Encoding and decoding both happen locally in your browser using the FileReader API — your image never leaves your device.

PNG, JPG, WebP, GIF, and SVG are all supported for both encoding and decoding.

Paste the generated data URL directly into an <img> tag's src attribute, e.g. <img src="data:image/png;base64,...">, with no separate image file needed.

Use the data URL as a background-image value, e.g. background-image: url("data:image/png;base64,...") — useful for small icons or sprites you want bundled into your stylesheet.

Base64 is a text encoding scheme that represents binary data — like an image file — as a string of letters, numbers, and a few symbols, so it can be embedded anywhere plain text is allowed, such as HTML, CSS, or JSON.

Base64 encoding increases file size by roughly 33% compared to the original binary, since every 3 bytes of image data becomes 4 characters of text. Larger or high-resolution images produce proportionally longer strings.

Yes, SVG files encode the same way as raster images — upload the .svg file and copy the resulting data URL.

You can encode images up to 20MB. Keep in mind very large Base64 strings are impractical to embed inline in HTML or CSS.

Switch to the Base64 to Image tab, paste a full data URL or a raw Base64 string, preview the result, then click Download image to save it as a file.