What is the Image to Base64 Converter?
The Image to Base64 converter is a developer tool that turns image files such as PNG, JPG, GIF, WebP, and SVG into a text string (Base64) and a Data URI, letting you embed an image directly inside HTML, CSS, or Markdown without a separate image file. Just drag & drop an image or paste it from your clipboard, and the browser's FileReader instantly builds a 'data:image/...;base64,...' Data URI.
Unlike a generic Base64 encoder that only outputs a raw string, this tool is purpose-built for embedding images on the web. It gives you a MIME-aware Data URI plus ready-to-paste HTML ＜img＞, CSS background-image, and Markdown snippets as separate tabs, along with a live preview and a roughly 33% size-overhead notice—all on one screen. It is ideal for front-end developers who want to inline small icons and logos to reduce HTTP requests.
Key Features
Drag, paste & batch upload
Drag & drop an image, pick a file, or paste from the clipboard with Ctrl+V. Upload several at once and choose each one from the thumbnails to convert.
Five output format tabs
Switch between raw Base64, Data URI, HTML ＜img＞, CSS background-image, and Markdown to instantly get the snippet you need. The MIME type is detected automatically.
Preview + size guidance
The converted Data URI renders live so you can verify the encoding, and the tool shows the overhead versus the original plus an inline-embedding recommendation (50 KB threshold).
One-click copy & download
Copy any format with a single click or download it as a .txt, .html, .css, or .md file. Everything runs entirely inside your browser.
How to Use
- Drag & drop an image onto the drop zone, click Select Files, or paste from the clipboard with Ctrl+V. You can add several images at once.
- Choose the output format tab you need (Base64 · Data URI · HTML · CSS · Markdown). The MIME type is detected automatically.
- Check that the image renders correctly in the preview, and review the size overhead and embedding recommendation.
- If you uploaded several files, pick the image to convert from the thumbnails to switch the result.
- Use Copy to put the code on your clipboard or Download to save it as a file (.txt/.html/.css/.md).
Use Cases
Inline small icons & logos
Drop a button icon or logo into your HTML/CSS as a Data URI so it renders without a separate request, speeding up the first paint.
Embed images in HTML email
In email where external images are often blocked, include a small image inline as a Data URI so it displays reliably.
Author CSS background-image
Inline a sprite or background pattern with CSS background-image: url() to keep everything in a single stylesheet.
Attach images in docs & README
Embed a small image directly in Markdown as  without external hosting so it never breaks when shared.
Frequently Asked Questions
What is image to Base64 conversion?
It turns an image's binary data into a text string (Base64). Prefixing that string with something like 'data:image/png;base64,' makes a Data URI, which lets you embed an image directly inside HTML, CSS, or Markdown without a separate image file. It is handy for inlining small icons or logos to cut HTTP requests.
Which image formats are supported?
PNG, JPG/JPEG, GIF, WebP, SVG, BMP, and ICO are supported. The MIME type is detected automatically so the 'data:image/...;base64,' prefix matches the format and the output works directly in the browser. You can also upload several images at once and pick each one to convert.
Does converting increase the file size?
Yes. Base64 represents 3 bytes with 4 characters, so the output is about 33% larger than the original, and the tool shows the exact overhead. That is why it works best for inlining small 1–2 KB icons and logos rather than large photos. A notice suggests linking a separate file when the image exceeds 50 KB.
How do the Data URI, HTML, and CSS outputs differ?
The Data URI is the raw 'data:image/...;base64,...' data URL. HTML wraps it in an ＜img src="..."＞ tag, CSS wraps it in background-image: url("..."), and Markdown uses . Pick the tab that matches where you'll use it (markup, stylesheet, or document) and copy-paste it straight in.
Are uploaded images sent to a server?
No. Every conversion runs entirely on your device through the browser's FileReader API, so neither the image nor the result is uploaded or stored on any server. It even works offline, so you can safely convert internal assets or sensitive images.
Can I convert SVG to Base64 too?
Yes, SVG converts to a Base64 Data URI just like raster formats. Note that SVG is text-based and often already small, and inside CSS url() a URL-encoded form can be more readable. Use Base64 conversion when inline embedding is specifically required.
Privacy Notice
Your uploaded images and the conversion results are processed entirely inside your browser via the FileReader API; no data is ever sent to or stored on a server. The tool even works offline, so you can safely convert internal assets and sensitive images.
Comments & questions