System · BAT
A 100 KB BAT file, on demand.
Exactly 102,400 bytes of a Windows batch script with a real @echo off header, built on your machine the moment you press the button.
102,400 bytes, exactly.
Every byte above the 111 bytes structural minimum goes into unreachable text after a goto :eof, which cmd.exe never parses, which is why this file still behaves like one a real user would send.
Unit convention
100 KB on this page means exactly 102,400 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 57 pages of typed text, 6.4 seconds of 128 kbps audio. These figures compare file size only — the generated file does not contain this text, audio or image content.
Accepted by
PHP default upload_max_filesize, Discord free attachment, AWS API Gateway payload — all publish a limit at or above this size, based on commonly cited figures that can vary by plan and change over time.
Other BAT sizes
This is where avatar and thumbnail uploaders usually cap, making it the standard size for testing the happy path of an image or document form.
100 KB in other system formats
Questions.
Is this 100 KB BAT file valid?
Yes. It is a Windows batch script with a real @echo off header. The extra bytes sit in unreachable text after a goto :eof, which cmd.exe never parses, so it opens in Notepad, VS Code and cmd.exe.
Does 100 KB mean 102,400 bytes?
On this page, yes — 100 KB uses the binary (MiB) convention, so the file is exactly 102,400 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 KB file used for?
This is where avatar and thumbnail uploaders usually cap, making it the standard size for testing the happy path of an image or document form. For BAT specifically, the usual job is testing script upload handling and text-file size limits.
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.