Drag & Drop File Upload Demo - Online With Preview
Drop files onto a zone and see a preview with name, size, and type. Copy the JavaScript pattern for your site.
UD5 Toolkit
Drop files onto a zone and see a preview with name, size, and type. Copy the JavaScript pattern for your site.
Encode any file into a Base64 string that you can copy, or decode a Base64 string back to a downloadable file. Pure frontend.
Paste a data: URL and instantly download the file it represents. Supports all MIME types. Simple extraction.
Drop any file to see its raw hexadecimal representation and ASCII side‑by‑side. Navigate with offset. Client‑side only.
Drop a file to see its MIME type and the first few magic bytes (hex and ASCII). No upload, works instantly.
Upload multiple text files and concatenate them into one, with optional separators. No upload; processed instantly.
Upload a small file to see each byte as a block, color-coded by value. Visualize the structure of binary data. Client-side.