Image to Base64 & Data URI Converter Online
Convert any PNG, JPG, SVG, GIF, or WebP image into a raw Base64 string or ready-to-paste `data:image/...;base64` URI in your browser.
Encode a file or image to Base64
Convert any file (PNG, JPG, SVG, PDF, fonts…) to a Base64 string or data URI. The file stays on your device.
Quick answer
To convert an image to Base64 online, click "Choose file" in the file section of the KaviForge Image to Base64 Converter and select your PNG, JPG, SVG, GIF, or WebP image. You immediately get both the raw Base64 string and the complete `data:image/...;base64,...` data URI for HTML `<img>` tags or CSS `background-image`. Your image stays on your device.
Embedding small icons, logos, or placeholder thumbnails directly into HTML (`<img src="data:image/png;base64,..." />`), CSS (`url("data:...")`), or JSON payloads eliminates extra HTTP requests and keeps single-file HTML documents self-contained.
This converter reads your image file locally in your browser using the FileReader API and outputs both the raw Base64 payload and the MIME-prefixed Data URI.
How to Convert an Image to Base64 or Data URI
- 1Scroll to the "Encode a file or image to Base64" section inside the tool and click "Choose file".
- 2Select a PNG, JPG, SVG, WebP, or GIF image from your computer.
- 3Preview the image and check the original vs. Base64 file size.
- 4Click "Copy Base64" for JSON/APIs or "Copy data URI" for HTML `<img>` tags and CSS.
Features
Supports PNG, JPG, SVG, WebP & GIF
Automatically detects your image’s MIME type and builds the exact `data:image/...;base64,` prefix.
Raw Base64 + Data URI Outputs
Copy just the Base64 payload for APIs or the full Data URI for HTML and CSS.
Instant Image Preview & Size Comparison
See a live preview of your encoded image and compare KB size before and after encoding.
Text to Base64 Included
Also encodes UTF-8 text or SVG source markup directly to Base64.
100% Local in Browser
Your photos, logos, and assets are never uploaded to any server.
Free & No File Limits
No watermarks, no account signup, and no daily conversion caps.
When to Use the Image to Base64 Converter
Inline icons and logos in HTML & CSS
Paste the `data:image/png;base64,...` URI into an `<img src="...">` attribute or CSS `background-image` rule.
Send images in JSON API payloads
Copy the raw Base64 string to send images to OpenAI Vision, Anthropic Claude, or REST endpoints.
Self-contained HTML email & single-file exports
Bundle images directly inside standalone HTML reports so nothing breaks offline.
When Should You Use Base64 for Images?
Base64 encoding represents binary image bytes as safe ASCII text, which increases the payload size by roughly 33%. Because of this overhead, Base64 Data URIs are best suited for small icons, logos, blur placeholders (LQIP), and single-file HTML documents under 10–20 KB.
For API payloads that only accept JSON (such as LLM vision APIs or webhook payloads), raw Base64 strings are the standard way to transmit binary images.
Image to Base64 Converter FAQs
How do I use a Base64 image in an HTML img tag?
Copy the "Data URI" output from this tool and paste it into the `src` attribute: `<img src="data:image/png;base64,iVBORw0KGgo..." alt="..." />`.
How do I use a Base64 image in CSS?
Paste the Data URI inside `url()`: `background-image: url("data:image/png;base64,iVBORw0KGgo...");`.
Are my images uploaded to a server?
No. Your image is read and encoded locally inside your browser tab.
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