Image Base64 Converter
Convert image files to Base64 Data URLs, or decode Base64 strings back to previewable, downloadable images. 100% client-side.
About This Tool
QuickKit Image Base64 Converter lets you convert image files to Base64 Data URLs and decode Base64 strings back to viewable, downloadable images — all inside your browser. Base64-encoded images can be embedded directly in HTML, CSS, or JSON without hosting a separate file, which is useful for inline icons, email templates, and data-URI schemes.
Features
- ✓Image → Base64 — Upload any image and get the full data:image/... Data URL for embedding in HTML or CSS.
- ✓Base64 → Image — Paste a Base64 string or Data URL to instantly preview the decoded image and download it.
- ✓One-click Copy — Copy the full Base64 Data URL to clipboard with a single button.
- ✓Privacy-first — FileReader API processes everything locally — your image never leaves your device.
FAQ
- What is a Base64 Data URL?
- A Data URL is a string prefixed with data:<mediatype>;base64, followed by the Base64-encoded image data. It lets browsers render images without a separate HTTP request.
- When should I use Base64 images?
- Best for small icons, email templates, or CSS backgrounds where an extra HTTP request is costly. Avoid it for large images as Base64 strings are ~33% larger than the original binary.
- What formats are supported?
- Any image your browser supports: JPEG, PNG, WebP, GIF, SVG, AVIF, etc.
- Why is my Base64 string not decoding?
- Ensure the string starts with data:image/ or is a valid raw Base64 string. Whitespace or truncation will cause decoding to fail.