File Upload & Download

Practice single-file and multi-file uploads (including drag-and-drop), client-side validation, fake progress bars, and real, openable file downloads (PDF, CSV, ZIP) generated entirely in the browser.

Single file upload

Max 5MB. Allowed extensions: .png, .jpg, .jpeg, .pdf, .txt, .csv, .docx.

Multi-file upload

Select multiple files at once, or use the drag-and-drop zone below. Remove any file before uploading with the × button.

Drag & drop files here

Downloads

Each button generates a real file client-side and triggers a browser download. All three are valid, openable files (not renamed text files).