Media
MP4 test files, any size.
Set a size and generate a structurally valid MP4 immediately. Nothing is uploaded and nothing is stored.
MP4, built to spec.
Each file is an ISO Base Media container with correct ftyp branding. The size you ask for is reached with a free box, the container’s own reserved-space atom, so the result opens in container parsers and ffprobe — note it carries no video track, so it will not play. Most people generate these for testing upload size limits where playback is not required.
Common sizes
Pick a size to jump straight to it, or set your own on the caliper above.
1 KB MP4
1,024 bytes
5 KB MP4
5,120 bytes
10 KB MP4
10,240 bytes
50 KB MP4
51,200 bytes
100 KB MP4
102,400 bytes
500 KB MP4
512,000 bytes
1 MB MP4
1,048,576 bytes
2 MB MP4
2,097,152 bytes
3 MB MP4
3,145,728 bytes
5 MB MP4
5,242,880 bytes
10 MB MP4
10,485,760 bytes
15 MB MP4
15,728,640 bytes
20 MB MP4
20,971,520 bytes
25 MB MP4
26,214,400 bytes
50 MB MP4
52,428,800 bytes
100 MB MP4
104,857,600 bytes
200 MB MP4
209,715,200 bytes
500 MB MP4
524,288,000 bytes
1 GB MP4
1,073,741,824 bytes
2 GB MP4
2,147,483,648 bytes
Questions.
How small can an MP4 file be?
About 48 bytes. Below that the format cannot carry its mandatory structure, let alone padding.
Will the file open normally?
Yes — it opens in container parsers and ffprobe — note it carries no video track, so it will not play, because the padding lives in a free box, the container’s own reserved-space atom.
Can I ask for an unusual size?
Any byte count above the minimum works, including values like 3,145,728 or 27.5 MB. Drag the caliper or type the number.
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