Image to Base64 Converter
Free Image to Base64 Converter — 4 Output Formats
Convert any image to Base64 encoding instantly in your browser. Choose from 4 output formats: Raw Base64 string, Data URI for use in src attributes, HTML img tag ready to paste into any webpage, or CSS background-image declaration ready for your stylesheet.
When to Use Base64 Image Encoding
Base64 is ideal for embedding small icons and logos directly into HTML emails (avoiding blocked image requests), inlining critical above-the-fold images to eliminate HTTP requests, storing images in JSON APIs or databases, and embedding images in CSS without separate file dependencies. Avoid Base64 for large images — the encoded size is 33% larger than the binary original.
Frequently Asked Questions
What is Base64 image encoding?
Base64 encoding converts binary image data into a text string of ASCII characters. This lets you embed images directly in HTML, CSS, JSON or email without needing a separate image file or server request.
What are the 4 output formats?
Raw Base64 — the encoded string only. Data URI — the full src-ready string starting with data:image/. HTML img tag — ready to paste into any HTML page. CSS background-image — ready to paste into a stylesheet.
Is Base64 good for all images?
Base64 is best for small images like icons and logos (under 5KB). Larger images increase file size by about 33% compared to the original binary file. For large photos use a regular image URL instead.
Is my image uploaded to a server?
No. All encoding happens entirely in your browser using the FileReader API. Your images never leave your device — completely private and secure.