What is a Base64 Data URI?

A Data URI is a URI scheme that includes the file data inline within a string, formatted as "data:image/png;base64,...", allowing assets to be embedded directly.

Does Base64 encoding increase image file size?

Yes. Base64 encoding represents binary data using 6-bit ASCII characters, increasing raw data size by roughly 33% compared to binary.

When should I use Base64 images?

Base64 is ideal for small icons, micro-graphics, critical preload patterns, and email signatures under 10–20KB where saving an HTTP request outweighs the size increase.

Can I decode a Base64 string back into an image file?

Yes. Paste any valid Base64 Data URI into the Decode tab to preview the image and download it as a PNG or JPEG.

Is my image uploaded during conversion?

No. File reading is performed by the browser's native FileReader API entirely in local memory.

Image Tools

Image to Base64

Convert images to Base64 strings for embedding.

100% Private & Client-Side Execution

Encoding and decoding run entirely on your local machine. No images are sent to any server.

About Image to Base64

Image to Base64 encodes bitmap images into inline Data URI strings that can be embedded directly into HTML `<img src="...">` tags, CSS `background-image` rules, and JSON payloads. It eliminates separate HTTP requests for critical micro-assets, icons, and email templates.

How to Use Image to Base64

Upload an image file (PNG, JPG, SVG, WebP, GIF) or paste an existing Base64 string into the decoder tab.
View the instant conversion into standard Base64 Data URI format.
Choose your preferred copy format: Raw Base64 string, CSS background rule, or HTML image element.
Click the Copy button to immediately use the string in your stylesheets or code.
Switch to the Decode tab anytime to verify or download Base64 strings as image files.

Common Real-World Use Cases

Email Developers: Embed small logo graphics and icons directly into HTML newsletters to bypass email client image-blocking.
Frontend Engineers: Inline critical above-the-fold SVG icons or tiny background patterns into CSS to reduce HTTP requests.
API Developers: Package image attachments as Base64 strings inside JSON API payloads for mobile and web endpoints.
Offline App Authors: Package graphic assets directly into single-file HTML or offline Progressive Web Apps.

Technical Specifications & Limitations

Supports PNG, JPG/JPEG, WebP, SVG, GIF, and ICO up to 5MB. Files under 50KB are recommended for optimal inline performance.

Frequently Asked Questions

What is a Base64 Data URI?: A Data URI is a URI scheme that includes the file data inline within a string, formatted as "data:image/png;base64,...", allowing assets to be embedded directly.
Does Base64 encoding increase image file size?: Yes. Base64 encoding represents binary data using 6-bit ASCII characters, increasing raw data size by roughly 33% compared to binary.
When should I use Base64 images?: Base64 is ideal for small icons, micro-graphics, critical preload patterns, and email signatures under 10–20KB where saving an HTTP request outweighs the size increase.
Can I decode a Base64 string back into an image file?: Yes. Paste any valid Base64 Data URI into the Decode tab to preview the image and download it as a PNG or JPEG.
Is my image uploaded during conversion?: No. File reading is performed by the browser's native FileReader API entirely in local memory.

Related Tools

Image Compressor Compress images without visible quality loss. Image Resizer Resize images to any dimension with quality preservation. Base64 Encoder Encode and decode Base64 strings online. SVG Optimizer Clean and minify SVG files for the web.