Inline small PNG in HTML
Generate a complete <img src="data:image/png;base64,..." alt="" /> snippet to embed a small icon directly into markup without extra HTTP requests.
Processed locally
Image to Base64 Online
Convert PNG, JPEG, WebP, GIF, BMP, and SVG images to Base64, Data URI, HTML, and CSS snippets locally in your browser with file size diagnostics.
Overview
What this tool does
Image to Base64 Converter converts local PNG, JPEG, WebP, GIF, BMP, and SVG images into raw Base64, Data URI, HTML <img> tags, and CSS background-image url() snippets locally in your browser. It measures pixel dimensions, checks byte sizes, and calculates payload overhead without uploading files to a server.
Workflow
How to use
Follow the core workflow below. Use “Show in tool” to locate the real control in the live tool above.
Add an image
Drop an image into the tool, choose a local file, paste an image from the clipboard, or click Replace image to change files. The image is processed 100% locally.
Drop image hereChoose imageReplace imagePaste imageReview the image and file facts
Check the local preview, image type, dimensions, and source file size before generating an inline representation.
PreviewTypeDimensionsOriginal sizeChoose the Base64 representation
Switch between Data URI, Raw Base64, HTML <img>, and CSS url() depending on where the encoded image snippet will be used.
Data URIRaw Base64HTML <img>CSS url()Check the encoded size
Review the Base64 length and size overhead before embedding large images directly into code or markup.
Base64 lengthOverheadLarge inline assetCopy the output
Copy only the representation you need. The selected Base64, Data URI, HTML, or CSS output stays local until you copy it.
Copy
Success
You can now convert local images to Base64, inspect facts and overhead, switch between Data URI, HTML, and CSS snippets, and copy the output.
Copy outputCopy summaryPractical cases
Examples
CSS background Data URI
Generate a CSS background-image: url("data:image/png;base64,...") declaration for standalone UI components or icon stylesheets.
Embed icon in JSON or config
Copy the raw Base64 string without data URI prefix to populate database fields, environment configs, or web manifest assets.
Compare raw file bytes vs Base64 length
Inspect original byte count alongside Base64 character length to verify the exact ~33% transport size overhead before embedding.
Clipboard screenshot to Data URI
Paste a screenshot directly from the clipboard and instantly obtain a Data URI snippet without saving temporary image files.
Troubleshooting
Common errors
- Using Base64 as image compression; Base64 increases transport payload size by approximately 33%.
- Including the data:image/...;base64, prefix where a raw Base64 string is expected by an API or schema.
- Specifying an incorrect MIME type in the Data URI header, causing image rendering failures.
- Embedding large image assets (>2 MB) inline, which degrades web page load performance and parsing speed.
- Expecting image quality, resolution, or color palette to change; Base64 conversion is byte-preserving.
From evidence to action
AI workflow
Use the generated Data URI, HTML or CSS snippet directly when code needs an inline image. Do not send a large Base64 payload to an AI assistant unless the payload itself is explicitly required.
Developer guides
Learn with this tool
Understand the concept, inspect a testable example, then open it in the tool above.
FAQ