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Dummy File Generator

Create a test file of an exact size and type on demand. Generate a 10 MB blank, a 1 GB placeholder or a small text sample to check upload limits, test forms, and try storage and transfer behaviour without hunting for a real file.

A dummy file generator creates a test file of an exact size and type on demand. Set a size and unit, pick blank, random bytes or repeated text, and download it, so it works to make a 10 MB test file or a 1 GB placeholder to check upload limits and forms. A blank file compresses to almost nothing, while random bytes stay their full size after zipping. The file is built on your own device with nothing uploaded.

Read the guide: How to Generate a Dummy Test File
Dummy File Generator

Size

Contents

Zero-filled. Compresses down to almost nothing in a ZIP.

File name

.
Creates test-file.bin at exactly 10.00 MB.

How it works

  1. 1

    Set the size

    Type the size you want and pick the unit: KB, MB or GB.

  2. 2

    Choose the contents

    Pick blank (zero-filled), random bytes or repeated text, and set the file name and extension.

  3. 3

    Download the file

    Generate the file on your device and download it, ready to use for testing.

Instant & 100% private — nothing is uploaded

Everything runs locally in your browser. Your files are processed on your own device and are never sent to a server, so there are no upload waits, no size limits from us, and nothing is ever stored or logged.

Frequently asked questions

Why would I need a dummy file?
To test things without real data. A file of a known size lets you check an upload size limit, see how a form or app handles a large attachment, measure a transfer speed, or fill space for a test, all without exposing anything real.
What is the difference between blank and random contents?
A blank file is filled with zero bytes, so it compresses down to almost nothing in a ZIP. Random contents do not compress, which is better when you want the file to stay its full size after archiving or transfer.
How large a file can I make?
Large files are built in your browser, so the practical ceiling is your device memory and the browser. Smaller sizes are instant; very large files take a moment and use more memory while they are created.

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