File to Base64 | Base64 Converter Online
Encode files to Base64 online. Convert any file to Base64 content for embedding in HTML, JSON, or XML. Free file to Base64 converter.
Drag & drop a file here, or click to browse
Maximum file size: 10.00 MB
Use Cases
- • Embed images directly in HTML/CSS
- • Send binary data through JSON APIs
- • Store files in databases as text
- • Email attachments (MIME encoding)
Features
- Encode any file type to Base64
- Drag-and-drop file upload
- Live file size and Base64 size preview
- Support for images, PDFs, ZIP files, and more
- Client-side encoding (files never leave your browser)
- Copy Base64 output or download as .txt file
Common Use Cases
- Embed images in HTML img src attributes
- Send binary files through JSON APIs
- Include logos and assets in email templates
- Convert fonts for CSS @font-face embedding
- Create data URIs for inline CSS backgrounds
File to Base64 Conversion
File to Base64 encoding converts any file's binary content into a text-safe Base64 string that can be embedded directly in HTML, CSS, JSON, or transmitted via APIs.
Common use cases:
- Data URIs -
data:image/png;base64,iVBORw0KG... - HTML embedding -
<img src="data:image/png;base64,..."/> - CSS backgrounds -
background-image: url(data:...) - API payloads - Send files in JSON without multipart/form-data
File size considerations: Base64 encoding increases file size by ~33%. A 100KB image becomes ~133KB when encoded. For large files, direct file uploads are more efficient.
Best practices: Use file-to-Base64 for small assets (<50KB) that need to be embedded. For larger files, use standard file uploads or CDN hosting.
Examples
File: logo.png (2.3 KB)
Base64: iVBORw0KGgoAAAANSUhEUgAAAAUA...
Data URI: data:image/png;base64,iVBORw0KG...File: document.pdf (15 KB)
Base64: JVBERi0xLjQKJeLjz9MKMSAwIG9ia...
Use in JSON: {"file": "JVBERi0xLjQKJe..."}File: video.mp4 (50 MB)
// Too large! Base64 would be ~67 MB
// Use direct upload insteadFrequently Asked Questions
You can convert any file type to Base64—images (PNG, JPG, GIF, SVG), documents (PDF, DOC), archives (ZIP, RAR), fonts (TTF, W OFF), videos, executables, and more. Base64 treats all files as binary data regardless of format.
Use a data URL in the src attribute:
<img src="data:image/png;base64,iVBORw0KGgo..." alt="Logo">
The format is: data:[MIME-type];base64,[BASE64-data]
For browser performance, keep Base64-encoded files under 50-100KB. Larger files cause longer encoding times, increased memory usage, and bloated HTML/CSS. For files >100KB, use direct uploads or CDN hosting instead.
No. All file encoding happens client-side in your browser using JavaScript. Your files never leave your computer, ensuring complete privacy and security. The tool uses the browser's FileReader API to process files locally.
Yes! Use a Base64 decoder to convert the Base64 string back to binary data, then save it with the correct file extension. Our Encode/Decode tool supports this, or you can use the browser's atob() function with Blob APIs.