Image to Base64 Converter
Convert image files to Base64 strings online for free. No upload required — runs entirely in your browser. Use the output to embed images inline in HTML, CSS, JSON, or APIs.
Checks that make conversion safer
Before converting
- Confirm the format required by the app, upload form, or person receiving the file.
- Check details that may change during conversion, such as transparency, animation, or image quality.
- Decide whether your main goal is compatibility, editing, or a smaller file size.
After converting
- Open the converted image and check colors, text edges, and visible artifacts.
- If the result is too large, continue with compression or resizing.
- Use PNG for editing stages, and JPG or WebP when the final goal is sharing or publishing.
Need help choosing the right workflow?
The guide section covers format differences, compression tips, and common PDF workflows so you can choose the right tool with more context.
Common next steps
When do you need Base64 encoding?
Base64 represents binary image data as a text string. This lets you embed images directly in HTML using <img src='data:image/png;base64,...'>, in CSS as background-image values, inside JSON payloads, or in email templates. It is a common technique for icons, logos, and other small images where avoiding an extra HTTP request is worth the size trade-off.
Data URL vs Base64-only
A Data URL includes the full prefix: data:image/png;base64,... and can be pasted directly into an HTML src attribute or CSS url() value. The Base64-only string is the raw encoded text without the prefix, which is useful for API payloads, JSON fields, and custom systems that add the prefix themselves.
Use the Data URL output when you are working with HTML or CSS directly. Use the Base64-only output when sending the image data through an API or embedding it in a structured format like JSON or XML.
File size consideration
Base64 encoding increases file size by approximately 33% because it represents binary data using only ASCII characters. Embedding large images inline can slow down page load times, so this technique works best for small icons, logos, and decorative elements under 1 MB.
Practical reminders
- Converting from Image to Base64 does not restore detail that is already missing in the source file.
- If a site, client, or upload form asks for a specific format, check that requirement before exporting.
- If file size still matters after conversion, compression or resizing is often the next useful step.
- Text-heavy graphics, transparent assets, and photos can behave very differently depending on the target format.
Image vs Base64
How to use
- Upload an image file (JPG, PNG, WebP, GIF, SVG, etc.)
- The Data URL and Base64 string appear automatically
- Copy the format you need using the copy button
FAQ
How do I use this in HTML?
Paste the Data URL directly into the src attribute: <img src="(paste Data URL here)">.
How do I use this in CSS?
Use it as a url() value: background-image: url('(paste Data URL here)').
Is my image safe?
Yes. All processing runs locally in your browser. Your image is never uploaded to a server.
Which image formats are supported?
JPG, PNG, WebP, GIF, SVG, AVIF, and any other format your browser can read.
Is there a file size limit?
The limit depends on your browser's memory. For practical use, Base64 encoding works best for images under 1 MB, since larger images produce very long strings.