Free VBS test files and sample generator
Classic Windows VBScript. Generate valid .vbs sample files to test uploads, script hosts, editors and legacy automation.
What is a .vbs file?
VBS: VBScript File. VBScript runs under Windows Script Host and remains present in legacy automation. It is also a historic malware vector, which is why security tooling pays attention to .vbs files.
Why generate a test VBS file?
- Test that security tooling flags or blocks script uploads.
- Verify legacy Windows automation handling.
- Check parsing of an older scripting language.
What you can put inside a .vbs file
You get 3 content options for VBS, so the file holds something meaningful rather than random padding: Definitions, Simple statements, With comments. For VBS these are alternatives, so choose the one that matches what you need to test.
How a .vbs file is identified
A .vbs file has no signature at the start. A script is identified by its extension and, on Unix, by a #! on the first line, which is why a byte-order mark breaks it.
How the size lands on the exact byte
The format allows comments, so the padding is comment lines, legal, inert, and visible if you open the file.
Negative testing with broken VBS files
- Invalid. Identifiable, but wrong inside, so it fails during parsing.
- Corrupted. The leading bytes are destroyed. Same length as the valid file.
- Incomplete. Truncated part-way, so it is genuinely shorter.
- Empty. Chosen under Content rather than File Condition: valid structure, no data.
Which failure to reach for, and what to assert for each, is covered in how to make a corrupted file for testing. For upload limits and type checks see testing file upload validation, and for this format's encodings, UTF-16 and BOM test files.
Sample VBS content
' sample Option Explicit WScript.Echo 137
This shows the shape of the file. Your download is generated fresh at the size you choose, so the values will differ.
How to open and verify the file
Inspect in a text editor. Review carefully before running with `cscript`.
Media type text/vbscript · extension .vbs · category Scripts & OS
Generate a .vbs file → · questions about sizes, privacy or cost are answered on the site FAQ.
Frequently asked questions about VBS files
What identifies a .vbs file?
Nothing at the start of the file does. A script is identified by its extension and, on Unix, by a #! on the first line, which is why a byte-order mark breaks it.
How can a .vbs file be an exact number of bytes?
The format allows comments, so the padding is comment lines, legal, inert, and visible if you open the file.
What can go inside the VBS file?
There are 3 content options for .vbs: Definitions, Simple statements, With comments. For VBS these are alternatives, so pick the one matching what you need to test.
Can I download several broken VBS files at once?
Yes, select more than one File Condition and you get one ZIP containing a .vbs per condition, each named after its condition.
Can the VBS file use UTF-16 or a byte-order mark?
Yes. .vbs is a text format, so it can be generated as UTF-8, UTF-8 with a byte-order mark, UTF-16 LE or UTF-16 BE. The body is shortened before re-encoding so the finished file still lands on the exact size you asked for. Note that a UTF-16 file always has an even byte count.
How do I open or verify the VBS file?
Inspect in a text editor. Review carefully before running with cscript.