Dummy File Generator

Dummy file creator & test file generator

Generate test files with exact specifications in your browser — a file generator by size for PDF, JPG, CSV, JSON, and more. Pick a format, set an exact size in bytes/KB/MB, and download. Nothing is uploaded to our servers. For step-by-step QA workflows, see our testing guides and scenario playbooks.

Shareable presets: add ?preset=pdf-upload-5mb or ?ext=csv&bytes=520000 to the URL.

1. Select File Type

Category:

One-click presets

Common QA sizes (limits are illustrative — always verify against your vendor docs).

2. Exact size, optional body & download

Hard cap ~512 MiB per generation (browser memory).

Select a file type above first.

The Ultimate Custom Dummy File Generator

While standard files cover the basics, rigorous software testing often requires precision. This tool allows you to generate files with exact byte specifications and custom content signatures. This is crucial for "Boundary Value Analysis" — testing the exact limits of your application's logic.

How to Use This Tool effectively

  1. Select Function: Choose "Generate" to create a new file from scratch, or "Convert" to transform text into a file.
  2. Set Parameters: Define the desired file size (in bytes, KB, or MB) and extension.

    Tip: Enter "1048576" bytes to generate an exact 1MB binary file.

  3. Choose Type: Select "Binary" for random efficient filling, or "Text" if you need the content to be readable characters.
  4. Generate & Download: The file is created locally in your browser memory and downloaded instantly.

Why Client-Side Generation Matters

Unlike other tools that generate files on a server and send them to you, our generator runs entirely in your browser. This offers three major benefits:

  • ✓
    100% Privacy: Your data (or the data structure you are testing) never leaves your device.
  • ✓
    Zero Latency: No waiting for network uploads or downloads. A 100MB file generates as fast as your CPU can process it.
  • ✓
    Unlimited Bandwidth: Since you aren't downloading from a server, you can generate gigabytes of test data without hitting daily limits or slow speeds.

Technical Specs

Max Single File Size
2GB*
*Browser memory limit dependent
Generation Algorithm
Pseudo-random byte stream
Supported Formats
Unlimited (Custom Extensions)
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