Test File Generator
Need a 5 MB JPG or a 100 KB PDF to test an upload limit? Pick a size and extension and download it instantly, generated locally in your browser, nothing is uploaded anywhere.
What you get
Real, valid files, not just correctly-named junk.
Structurally valid. Open in any PDF viewer, unzip cleanly, or render as a real GIF, padded to your exact target size.
A real tiny image, padded to size using standard comment/chunk mechanisms every image viewer already knows to skip.
Readable filler text, random bytes, or all-zero: your choice, exact byte count.
Everything above ~a few hundred bytes hits your exact target size. A handful of formats (PDF, GIF, JPG, PNG, ZIP) have a small unavoidable structural minimum. The tool always shows you the real generated size, not just what you asked for.