Client-side QA tooling
Generate test files.
Exactly the size you need.
Create PDF, JPG, PNG, JSON, CSV, MP4, WAV, and other test fixtures directly in your browser. No uploads. No accounts. No server required.
File type
Target size
Filename
How It Works
1. Select Format
Filter by category (Text, Documents, Media, …) then pick PDF, JPG, JSON, WAV, and more.
2. Set Size
Optional exact size in bytes, KB, or MB — perfect for boundary and upload-limit tests.
3. Optional Body
For text formats, optionally paste JSON, CSV, or HTML; binary types use embedded templates.
4. Download
Save the file securely. No server upload is ever involved.
The primary workspace
Generate a fixture, then test it.
Create a test file
02 / Configure
Set an exact byte target and optional text content.
One-click presets
Common QA sizes (limits are illustrative — always verify against your vendor docs).
Hard cap ~512 MiB per generation (browser memory).
Choose a file type to get started.
100% Client-Side
Files are generated purely in JavaScript. No server info means full compliance with NDA and GDPR.
Instant Speed
Direct Blob creation bypasses network latency. Generate 1GB files in seconds.
Any Format
From PDF to binary. Validate your application's file type detection logic strictly.
What is Dummy File Generator?
Dummy File Generator is a free test file generator and dummy file creator for QA engineers, testers, and developers. It helps you build sample files of specific sizes and formats (PDF, JPG, JSON, CSV) to validate upload limits and MIME checks in your applications — as a true file generator by size, not approximate downloads from the web.
Popular testing scenarios
- 5 MB dummy PDF upload test — boundary value analysis for storage tiers.
- Exact-byte file generator — pin payloads like 1,048,577-byte JPEGs for API quotas.
- Large padded CSV — ETL and import benchmarks without PHI.
- PDF format guide — structure, MIME, and when to pad dummy PDFs.
Who is this for?
- QA Testers: Verify upload limits (e.g., rejecting files > 5MB).
- Developers: Test MIME-type validation logic.
- System Admins: Check storage behavior and disk quotas.
Why Developers Use It
Finding a "clean" 5MB PDF or a corrupt JPG for testing is surprisingly hard. Downloading random files involves security risks. Our tool generates these files locally in your browser, ensuring 100% safety and privacy.
Supported Formats
We support generating legitimate file headers for text, documents, images, audio, and video containers used in upload QA:
- Text & data: TXT, JSON, CSV, XML, YAML, SQL, Markdown
- Documents: PDF, HTML
- Images: JPG, PNG, GIF, SVG
- Media: MP3, WAV, MP4, WebM (synthetic shells for MIME/size tests)
Editorial content on this site
Beyond the generator, we maintain long-form resources so teams can learn why and when to use dummy files: step-by-step guides, searchable format explainers, intent-based scenario playbooks with shareable URLs, an engineering blog, and a glossary of MIME and upload terminology. That editorial layer is the primary publisher content; the generator is a companion utility that runs entirely in your browser.
Privacy & compliance
Because generation is client-side, you can use Dummy File Generator on locked-down laptops and in environments where uploading sample data to unknown SaaS tools is prohibited. Read our privacy policy for details on analytics and advertising technologies.