Image to Base64 Encoder
Convert any image to a Base64 data URL string instantly in your browser. Copy or download the result.
Pure browser JavaScript (HTML canvas) — no upload.
How to use this tool
- Choose an image.
- The Base64 data URL appears below.
- Copy or Download as .txt.
Convert any image to a Base64 data URL string instantly in your browser. Copy or download the result.
How it works
The Image to Base64 Encoder converts any image file into a Base64-encoded text string formatted as a data URL. This format embeds the full image directly inside text, making it possible to include images in CSS, HTML, JSON payloads, or email templates without separate file references.
Upload your image and the tool immediately produces the data URL in the format data:image/png;base64,... Click Copy to put the string on your clipboard, or Download to save it as a .txt file. Everything runs locally in your browser; no image data leaves your machine.
Base64 encoding is commonly used to inline small icons or loading spinners in stylesheets, embed images in JSON API responses, attach images to email without MIME attachments, or store image data in databases as text. Keep in mind that a Base64 string is roughly 33 percent larger than the original binary file, so inlining large images increases page weight.
Worked example
Inline a small logo in an HTML file
- Upload your logo PNG to the encoder.
- Wait for the data URL to appear in the output box.
- Click Copy to copy the full data URL.
- In your HTML, set the img src attribute to the copied string.
An HTML img tag that displays the logo without needing an external file.
Common mistakes to avoid
- Using Base64 for large images and wondering why the page loads slowly -- inline images above about 5 KB should usually be served as separate files.
- Copying only part of the data URL and then getting broken image errors when pasting it.
- Forgetting to include the data URL prefix (data:image/png;base64,) when pasting into HTML or CSS.
Key terms
- Base64
- An encoding scheme that converts binary data into a string of 64 printable ASCII characters, making binary safe to embed in text formats.
- Data URL
- A URI scheme that embeds file content directly in the URL string rather than pointing to an external resource.
- MIME type
- A label such as image/png or image/jpeg that tells software what kind of data a file contains.
Frequently asked questions
- What is a data URL?
- A data URL embeds the image bytes as Base64 text, useful for embedding images in HTML/CSS/JSON without a separate file.