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Image ↔ Base64 Converter

Convert images to Base64 encoded strings, or paste a Base64 string to preview and download the image. 100% private — no server upload.

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Click to upload or drag & drop an image

PNG, JPG, GIF, WebP, SVG supported

About Image ↔ Base64 Converter

Encode any image to a Base64 string for embedding in HTML, CSS, or JSON. Or decode a Base64 string back to a viewable and downloadable image. Supports all major image formats. Copy the result as a raw Base64 string, a full data URL, or a ready-to-use HTML <img> tag.

How to Use — Image to Base64

  1. Select the Image → Base64 tab.
  2. Upload any image file (PNG, JPG, GIF, WebP, SVG).
  3. The Base64 encoded string appears instantly below the preview.
  4. Click Copy Base64 to copy the raw string, Copy Data URL for the full data:image/... URI, or Copy <img> tag for a ready-to-paste HTML snippet.

How to Use — Base64 to Image

  1. Select the Base64 → Image tab.
  2. Paste your Base64 string (with or without the data:image/...;base64, prefix).
  3. Click Decode Image to preview the image.
  4. Click Download Image to save it to your device.

Frequently Asked Questions

Base64 is a method of encoding binary data (like image files) into a text string using only ASCII characters. This lets you embed image data directly into HTML, CSS, or JSON without needing a separate image file or URL.
Base64 is useful for small icons or logos embedded directly in CSS or HTML to eliminate an extra HTTP request. It is also used in emails (where external images may be blocked) and in JSON APIs that transfer image data as text.
Base64 encoding increases the data size by approximately 33% because every 3 bytes of binary data are represented as 4 characters of text. For large images this overhead can be significant, which is why Base64 is best suited for small images.
A Data URL (or data URI) combines the MIME type and the Base64 string into a single string in the format data:image/png;base64,.... You can use it anywhere a normal image URL is accepted, such as in an HTML src attribute or CSS background-image.
No. The entire conversion happens in your browser using the FileReader API. Your image data never leaves your device.

About Image to Base64 Converter

Base64 encoding converts binary image data into ASCII text, allowing images to be embedded directly in HTML, CSS, or JSON without a separate file request. This tool converts images to Base64 and back — entirely in your browser.

How to Use

  1. Click Upload Image to choose an image file.
  2. The Base64 encoded string appears instantly in the output area.
  3. Copy the data:image/... URI for use in HTML or CSS.
  4. To decode: paste a Base64 string and click Decode to preview the image.

How It Works

The browser reads the image file using FileReader.readAsDataURL(), which returns a Base64-encoded data URI. To decode, the data URI is set as the src of an <img> tag for preview.

Example

A small icon converted to Base64 can be embedded in CSS: background-image: url('data:image/png;base64,iVBORw0KGgo...'); This eliminates one HTTP request for small images.

Frequently Asked Questions

Base64 eliminates separate HTTP requests for small images, reduces latency, and works in environments where file paths aren't possible (like inline HTML emails or data URIs in CSS). It is best for small images under ~10KB.
No. Base64 increases file size by approximately 33% compared to the binary original. The trade-off is eliminating an HTTP request. For large images, loading a separate file is almost always better.
Any image format the browser can read works: JPG, PNG, GIF, WebP, SVG, BMP. The data URI will use the appropriate MIME type (e.g. image/png, image/jpeg).
No. The FileReader API processes your image entirely in your browser. Your image data never leaves your device.