📖 What is Image to Base64?
Image to Base64 converts an image file into a Base64-encoded data URI string. The output can be embedded directly in CSS (as a background-image), HTML (as an img src), or JSON without needing a separate file. Supports PNG, JPG, GIF, SVG and WebP formats. Everything runs in your browser — your images are never uploaded.
💡 Example
Input
Upload: icon.png (2 KB)
Output
data:image/png;base64,iVBORw0KGgoAAAANSUhEU...
🛠️ Common Use Cases
- Embedding small icons in CSS to avoid extra HTTP requests
- Including images in JSON API responses or configuration
- Embedding images in HTML email templates
- Creating self-contained single-file HTML pages
- Converting images for use in data URIs
📝 When to Use Base64 Images
- Do use for small icons (<2KB), CSS sprites, email templates
- Don't use for large images — Base64 increases size by ~33% and prevents browser caching
- Base64 images add to CSS/HTML file size, increasing initial parse time
- For larger images, a regular URL with proper caching is more efficient
⚠️ Common Mistakes
- Encoding large images — a 100KB image becomes ~133KB in Base64 and cannot be cached separately
- Wrong MIME type — the data URI must match the actual image type (image/png, image/jpeg, image/svg+xml)
- Using in production CSS bundles — Base64 images bloat CSS files. Use only for tiny icons or email templates.
❓ Frequently Asked Questions
How much larger is a Base64-encoded image? ▾
Approximately 33% larger than the original binary. A 3KB icon becomes ~4KB in Base64.
Can I use Base64 images in CSS? ▾
Yes — use background-image: url(data:image/png;base64,...). Best for small icons under 2KB.
Does Base64 work in all browsers? ▾
Yes — data URIs with Base64 are supported in all modern browsers. IE8+ supports them up to 32KB.
Is my data private? ▾
Yes — all processing runs entirely in your browser. Your data is never sent to any server.
Is this tool free? ▾
Completely free — no login, no usage limits, works offline once loaded.
Yes — completely free, no login required, no usage limits.
Is my data private? ▾
Yes — all processing runs in your browser. Your data is never sent to any server.
Does it work offline? ▾
Yes — once the page is loaded, the tool works without an internet connection.