Corrupt File Generator
Corrupt a file to test an uploader: one kind of damage per file, with a description of the consequences.
Or take a ready-made sample
A whole file in the format you need, if you don't have one of your own at hand.
Choose and download a broken file:
The tool takes a working file and breaks exactly one spot in it. The result looks untouched: same extension, same size, same beginning. You use it to test someone else's code, a uploader, an importer, or a viewer, and see what the program tells a person once the file turns out to be corrupted. Drag your own file into the window, or, if you don't have one at hand, take a ready-made sample: PNG, JPEG, PDF, ZIP, DOCX, XLSX, WAV, or TXT.
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