Image to Base64 Encoder Online
Encode images as Base64 data URIs — single or batch
Como usar Image to Base64
- 1
Upload one or more images
Drop a single image or multiple files. Batch mode activates automatically when 2 or more files are loaded.
- 2
Copy the encoded output
Each image is encoded instantly. Copy the data URI, Base64 string, or HTML img tag for use in your code.
- 3
Use in your code
Paste the data URI directly into your HTML, CSS, or JSON.
- 4
Download as JSON (batch)
In batch mode, click 'Download all as JSON' to get every encoded image in one structured file.
Perguntas frequentes
Is my data safe?
Why use Base64 for images?
Does Base64 increase file size?
What image formats are supported?
Can I decode a Base64 string back to an image?
Can I encode multiple images at once?
Saiba mais
O que é Image to Base64?
Convert any image to a Base64-encoded data URI for embedding directly in HTML, CSS, or JSON. Supports PNG, JPEG, WebP, GIF, and SVG. Eliminates separate HTTP requests by inlining the image directly in your code. Useful for email templates that block external images, single-file HTML documents, CSS background images, and API payloads that need to carry image data. No file uploads required — encoding happens instantly in your browser using the FileReader API. No sign-up, no limits. Drop multiple images at once to encode them all in one go and download a single JSON file containing every data URI, Base64 string, and img tag — ready to paste into your project.
Por que usar Image to Base64?
- Eliminate extra HTTP requests — inlining images as Base64 removes the separate request for each image file, reducing latency.
- Works in email templates — email clients often block externally hosted images, but Base64-encoded images are always displayed inline.
- Useful for single-file HTML exports, screenshots embedded in JSON reports, and self-contained components.
- Supports all common image formats: PNG, JPEG, WebP, GIF, and SVG.
- Completely private — encoding happens in your browser. Your images are never sent to any server.
- Batch encode — drop 2 or more images to encode them all at once. Download a JSON file with every data URI, Base64 string, and HTML img tag in one click.
Casos de uso de Image to Base64
Email HTML templates
Embed small logos, icons, or decorative images directly in HTML emails to ensure they display even when external images are blocked by email clients.
CSS background images
Use data URIs in CSS for small background patterns or icons, reducing HTTP requests and improving load time for critical UI elements.
Single-file applications
Bundle all assets into one HTML file by embedding images as Base64, making the file fully self-contained and shareable as a single attachment.
API payloads
Some APIs accept or return images as Base64 strings within JSON. Convert your image here before constructing your API request.
Dicas e boas práticas
- 💡Base64 increases data size by about 33%, so only inline images that are small (ideally under 5 KB). Larger images are better served as separate files.
- 💡The generated data URI can be used directly as an img src attribute: <img src="data:image/png;base64,...">
- 💡For CSS, use it as a background: background-image: url('data:image/png;base64,...');
- 💡SVG files encoded as Base64 are often larger than SVG inlined directly in HTML. For SVG, consider using an inline <svg> tag instead.
Como funciona
The encoder uses the browser's FileReader API with readAsDataURL() to convert the image binary to a Base64 data URI. The output format is data:[mimeType];base64,[base64string], which is the standard data URI scheme defined in RFC 2397. The MIME type is automatically detected from the file. SVG files are handled as text/plain or image/svg+xml depending on the file content. Encoding is synchronous for small files and asynchronous for larger ones to avoid blocking the UI.