Does Base64 encoding increase file size?

Yes, Base64 encoding increases the data size by approximately 33%. A 10KB image becomes about 13.3KB when Base64 encoded. This is the trade-off for being able to embed images directly in code.

Image to Base64 Converter

Encode images to Base64 data URI strings or decode Base64 back to images. Processed in your browser — nothing is uploaded.

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Drag & drop, click to browse, or press Ctrl+V to paste

Supports: JPG, PNG, GIF, WebP — processed locally

Original: 0 KB Base64: 0 KB Increase: +33%

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What is Base64 Image Encoding?

Base64 is a binary-to-text encoding scheme that represents binary data as ASCII characters. When you encode an image to Base64, you get a text string that can be embedded directly in HTML, CSS, or JSON without requiring a separate file.

Extra HTTP Requests

Embed images directly in HTML/CSS — no additional server requests needed

+33%

Size Increase

Base64 encoding increases data size by ~33%. Best for small images under 10KB

100%

Browser Support

Data URIs are supported by all modern browsers including mobile

Frequently Asked Questions

What is Base64 image encoding?

Base64 encoding converts binary image data into a text string using 64 ASCII characters. This allows you to embed images directly in HTML or CSS code using data URIs like data:image/png;base64,...

When should I use Base64 images?

Base64 is ideal for small images (icons, logos, placeholders) under 10KB, email HTML templates where external images may be blocked, and single-file applications. For larger images, regular files are more efficient.

Is my image uploaded to a server?

No. Everything is processed in your browser using the FileReader API. Your images never leave your device.