Base64 File Encoder & Decoder
Convert any file into Base64 data URIs and CSS snippets, or decode Base64 strings into original binary files. 100% in-browser processing.
Drop any file here to encode
Supports images (PNG, JPG, WebP, SVG), documents, PDFs, audio, or archives
100% In-Browser · 0 Bytes Sent to ServerHow to Use Base64 File Encoder & Decoder
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Choose Encode or Decode mode
Select "Encode File to Base64" to convert any file into a string, or "Decode Base64 to File" to reconstruct binary files.
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Upload file or paste Base64
Drag and drop any image, document, PDF, or binary file, or paste an existing data URI / Base64 string.
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Copy snippet or download file
Copy the standard RFC 2397 Data URI, CSS background snippet, or download the reconstructed file directly.
Base64 Data URI Example
favicon.png (PNG image, 1.2 KB)data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9h...Ready to paste into img src or CSS background-image url().
Technical Specifications
- Supported Inputs: All file formats (PNG, JPG, PDF, SVG, TXT, ZIP, etc.), Base64 strings, RFC 2397 Data URIs
- Input Limit: 50 MB in-browser
- Processing Engine: 100% In-Browser (FileReader & Uint8Array APIs)
- Content Uploads: None (Your files and text are processed locally on your device with zero uploads)
Privacy & Security Guarantee
Your files and encoded strings are processed entirely in your web browser's memory using native client-side web technologies. Unlike traditional cloud tools, your content is never uploaded to remote servers, stored on external disks, or analyzed by third parties.
2ClickKit In-Browser vs Traditional Cloud Tools
| Feature | 2ClickKit (In-Browser) | Traditional Cloud Services |
|---|---|---|
| Data Privacy | Files never leave your local device | Uploaded to remote servers and third-party clouds |
| Processing Speed | Instant local execution (0ms upload time) | Constrained by internet upload & server processing queues |
| Account & Costs | 100% Free with zero registration or paywalls | Tiered subscriptions, limits, or forced sign-ups |
Best Practices & Tips
- Use Data URIs for small icons and avatars to eliminate extra HTTP network requests.
- For files larger than 2MB, standard URLs are usually more efficient than embedding Base64 strings due to the ~33% Base64 size overhead.
Frequently Asked Questions
What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It allows you to embed images, audio, and documents directly inside HTML, CSS, or JSON without separate HTTP requests.
Are my files sent to any remote server?
No. The entire encoding and decoding process runs locally in your browser using standard JavaScript FileReader and Blob APIs. No data leaves your machine.
What file types are supported?
Any file type! Images (PNG, JPEG, WebP, SVG, GIF), PDFs, Word documents, audio files, and ZIP archives can all be encoded and reconstructed.
What is the difference between a Data URI and raw Base64?
A Data URI includes a metadata prefix (e.g. data:image/png;base64,) specifying the MIME type, ready for use in HTML <img> tags or CSS. Raw Base64 is only the encoded payload.