System · EXE
A 100 MB EXE file, on demand.
Exactly 104,857,600 bytes of a genuine MS-DOS + PE header — the same bytes file-type scanners and antivirus engines check to identify a Windows executable, built on your machine the moment you press the button.
104,857,600 bytes, exactly.
Every byte above the 512 bytes structural minimum goes into trailing bytes after a header that declares zero sections, so a real Windows loader refuses to run it, which is why this file still behaves like one a real user would send.
Unit convention
100 MB on this page means exactly 104,857,600 bytes, using the binary (MiB) convention some systems label "MB" for short. 1 MB in the strict decimal sense is 1,000,000 bytes; 1 MiB is 1,048,576 bytes — the readout above always shows the exact count either way.
Approximate size equivalents
Roughly 58,254 pages of typed text, 109 minutes of 128 kbps audio, 10 minutes of CD-quality audio, 42 photos from a 12 MP camera. These figures compare file size only — the generated file does not contain this text, audio or image content.
Accepted by
Cloudflare Free proxy body, GitHub repository file, Slack free workspace file — all publish a limit at or above this size, based on commonly cited figures that can vary by plan and change over time.
Rejected by
Gmail attachment, Outlook.com attachment, Discord free attachment — this exceeds their commonly cited limit, which makes it a useful negative test. Published limits can vary by plan and change over time.
Other EXE sizes
Files this large exercise multipart and chunked upload paths rather than a single request, which is usually where the bugs are.
100 MB in other system formats
Questions.
Is this 100 MB EXE file valid?
Yes. It is a genuine MS-DOS + PE header — the same bytes file-type scanners and antivirus engines check to identify a Windows executable. The extra bytes sit in trailing bytes after a header that declares zero sections, so a real Windows loader refuses to run it, so it opens in file managers and antivirus scanners — deliberately never executes.
Does 100 MB mean 104,857,600 bytes?
On this page, yes — 100 MB uses the binary (MiB) convention, so the file is exactly 104,857,600 bytes. 1 MB in the strict decimal sense would be a different, smaller byte count. Upload validators may use either convention, so the exact byte count is always shown to remove any ambiguity.
What is a 100 MB file used for?
Files this large exercise multipart and chunked upload paths rather than a single request, which is usually where the bugs are. For EXE specifically, the usual job is testing upload size limits, download managers and file-type filters without ever shipping runnable code.
Where is the file downloaded from?
Nowhere. It is assembled in a Web Worker on your own device and handed to the browser as a Blob, so nothing is uploaded, fetched or stored.