Placeholder File Generator - All Formats
Generate placeholder and test files instantly. Create dummy text, JSON, CSV, PNG/JPG images, WAV/MP3 audio, and video files.
Runs in your browser. No data leaves your device.
Frequently Asked Questions
How does the Placeholder File Generator work?
Each file type uses a different generation strategy: text files are built from Lorem Ipsum or random strings, JSON/CSV files are constructed programmatically from schema templates, images are drawn onto an HTML Canvas with your chosen dimensions and colors, audio files are synthesized using the Web Audio API's OfflineAudioContext (sine tones, noise, or silence), and video files are captured from a canvas animation using MediaRecorder. All generation happens client-side in the browser.
What file types can I generate?
Plain text, JSON, CSV, PNG images, JPG images, WAV audio, MP3 audio, and video files (MP4 or WebM depending on your browser).
What are placeholder files used for?
Placeholder files are commonly used for software testing, UI/UX mockups, design prototyping, filling CMS content areas, testing file upload forms, and creating sample datasets.
Can I customize the generated files?
Yes. Each file type has its own options. Images support custom dimensions and colors. Audio files can be tones, noise, or silence at configurable frequencies and durations. Data files offer presets for common schemas.