Download JSON Files by Exact Size
Need sample JSON files with specific sizes? Generate precise payloads in your browser with one click. Perfect for testing API uploads, rate limits, and performance.
Download JSON Files by Size (Bytes, KB, MB)
Generate and download JSON files in precise sizes for testing APIs, upload limits, and performance scenarios. Client-side only for privacy—your data never leaves the browser.
Exact-size generation with a controllable padding field for precision.
Popular Use Cases
- Test API upload limits with precisely sized payloads.
- Benchmark network performance across different file sizes.
- Validate client-side file validators and size restrictions.
- Generate fixtures for E2E, integration, and unit tests.
Ready to Get Started?
Choose from our suite of JSON tools to start processing your data right away.
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Ai JSON Generator
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APIs with Fake JSON Data
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FAQ
Do you store any generated files?
No. Files are generated locally and downloaded directly. Nothing is uploaded or stored on our servers.
Why does pretty printing change the size?
Pretty printing adds whitespace (newlines and spaces) to improve readability, so the byte size increases compared to compact JSON.
How do I generate very large files?
Use the 5 MB or 10 MB presets as a starting point. For larger sizes, try incrementally increasing the custom size and ensure your device has enough memory.