Free Toolkit

Dummy File GeneratorGenerate files of any specified size for testing uploads, downloads, and storage systems.

Dummy File Generator illustration
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Dummy File Generator

Generate files of any specified size for testing uploads, downloads, and storage systems.

How to Use
1

Set Size

Enter desired size in KB, MB, or GB.

2

Choose Format

Binary or text.

3

Download

Generate and download.

What Is Dummy File Generator?

Creates Blob-based files of exactly the specified size, from 1KB to 1GB+. Generated entirely in your browser—no server download. Contains null or random bytes. Perfect for testing uploads, downloads, email attachments, storage quotas, and API file handling.

Why Use Our Dummy File Generator?

  • Exact sizes KB to GB
  • Browser-based
  • Test upload limits
  • Binary and text
  • Instant generation

Common Use Cases

Upload Testing

Test upload forms with specific sizes.

Speed Testing

Measure transfer speeds.

Storage Testing

Test quotas and cleanup.

API Testing

Test file handling and timeouts.

Technical Guide

Blob constructor with Uint8Array. Large files in chunks. Download via URL.createObjectURL() with programmatic anchor click. Size units: KB*1024, MB*1024^2, GB*1024^3. URL revoked after download.

Tips & Best Practices

  • 1
    Start small (1-10MB)
  • 2
    Large files (100MB+) take a few seconds
  • 3
    Watch RAM for very large files

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Frequently Asked Questions

QHow large?
Up to 500MB on most devices.
QExact size?
Yes, exactly specified bytes.
QUses internet?
No, entirely in browser.

About Dummy File Generator

Dummy File Generator is a free online tool from FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration required. No ads. Just fast, reliable tools.