Image to Base64 Converter
Encode an image as a data URL or raw Base64 for HTML, CSS, JSON, and scripts.
Choose an image to encode
PNG · JPG · GIF · WEBP · SVG — up to 25 MB
Your image never leaves this browser
100% local conversion
- →Your image is read with the browser's FileReader API
- →No upload, no account, no server-side storage
- →Copy a data URL or raw Base64 string
Base64 output is about 33% larger than the original file, so this tool works best for images under a few MB. Large images are still supported up to 25 MB.
How to Convert an Image to Base64
- 1
Choose an image
Click the upload area, drag a file in, or paste from your clipboard. PNG, JPG, GIF, WEBP, SVG, and other browser-readable formats work.
- 2
Watch it encode locally
Your browser reads the file and produces the data URL instantly. No bytes leave your device.
- 3
Pick your output
Use the Data URL tab for HTML/CSS embedding or the Raw Base64 tab for APIs, JSON, and databases.
- 4
Copy or download
Copy the full string to your clipboard or download it as a .txt file for later.
Why Convert Images to Base64 Locally
Unlike hosted converters that upload your image and return a URL, this tool performs the entire conversion on your device.
Runs entirely in your browser
The FileReader API converts the file on your device. There is no upload step, so the tool works offline-friendly and keeps your image private.
Data URL and raw Base64
Switch between a complete data URL for HTML and CSS, or the raw Base64 string for JSON payloads, APIs, and storage.
One-click copy
Copy the full output — not a truncated preview — straight to your clipboard, even when the string is hundreds of thousands of characters long.
Download as a text file
Save the encoded output as a .txt file so you can move large Base64 strings between tools without losing them.
Paste support
Copy a screenshot or image in another app and paste it directly with Ctrl/Cmd+V. Encoding starts immediately.
No account required
Because nothing is uploaded, there are no daily limits, file quotas, or sign-up walls.
Supported Formats and Limits
Supported formats
Any format your browser can render and read, including PNG, JPG, GIF, WEBP, SVG, AVIF, and BMP. The data URL preserves the original MIME type.
Size limit
Files up to 25 MB are accepted. Base64 output is about 33% larger than the source, and encoding happens in memory, so oversized files are rejected instead of freezing your browser.
Privacy: Your Image Never Leaves This Page
Image to Base64 is a browser-only tool. The file is read with the FileReader API on your device and encoded locally. Photo2URL does not upload, receive, process, or store the image, and the encoded result is never sent to our servers.
That makes this tool different from Photo2URL's hosted Image to URL tool, which uploads files to create a permanent public URL. If you need a hosted URL instead of a data string, use the Image to URL converter.
Frequently Asked Questions
Is the Image to Base64 converter free?
Yes. Encoding runs entirely in your browser, so there are no usage quotas, accounts, or server costs. Convert as many images as you like.
Is my image uploaded anywhere?
No. The image bytes are read locally with the browser's FileReader API and converted to Base64 on your device. Nothing is uploaded to Photo2URL or stored on our servers. When you leave or refresh the page, the encoded result disappears.
What is the difference between a data URL and raw Base64?
A data URL includes the MIME prefix — for example data:image/png;base64,iVBORw0KGgo... — and can be used directly in an img src or CSS url(). Raw Base64 is just the encoded text after the comma, which you can store or transmit and prefix yourself when needed.
Which image formats are supported?
Any image format your browser can read: PNG, JPG, GIF, WEBP, SVG, AVIF, BMP, and more. The original MIME type is preserved in the data URL.
What is the maximum file size?
Files up to 25 MB are accepted. Base64 output is roughly 33% larger than the original, and very large files can consume significant browser memory, so the tool rejects anything over 25 MB with a clear message.
Why is the Base64 output bigger than my image?
Base64 encodes binary data using 64 characters, so it needs about 4/3 as many characters as the original file has bytes. That size difference is normal and applies to every Base64 encoder.
How do I convert Base64 back into an image?
Use Photo2URL's Base64 to Image tool, which decodes Base64 and data URLs back into a previewable, downloadable image file — also entirely in the browser.