Test file generator
Valid files of an exact size for testing uploads, limits and validation. Up to 500 MB.
1,048,576 B · Minimum for this format: 768 B · Maximum: 500 MB
Everything runs in your browser: your input and files are never uploaded.
How to use
- Choose a file format.
- Enter the size and unit: bytes, KB or MB.
- Click “Generate”: the file is built in your browser and downloaded.
FAQ
Do the files really open?
Yes. Each file is a real document of its format: the PDF opens in a viewer, images in an editor, DOCX in Word. Padding is added in a way the format itself allows.
Is the size exact?
Yes, to the byte. 1 KB = 1024 bytes, 1 MB = 1,048,576 bytes.
Why is there a minimum size?
Every format has a mandatory structure: headers, pages, metadata. A valid file cannot be smaller than that.
Can I make a file larger than 500 MB?
Not yet: the file is assembled in browser memory, and very large sizes can crash the tab on weaker devices.
What is it for?
For testers and developers: checking upload limits, file type validation, progress bars and behaviour with large files.