Upload Simulation Tool
Simulate real-world file upload scenarios entirely in your browser. Test how your UI handles slow connections, interrupted transfers, chunked uploads, and timeouts — no server required.
Select a file to simulate upload
Any file — it stays in your browser
Ready
Why Simulate Uploads?
Test Progress Bars
Verify your upload progress UI works correctly at different speeds. Catch edge cases like 0% stuck states and 100% completion delays.
Error Recovery
Test how your application handles upload failures, timeouts, and network interruptions. Verify retry logic and user-facing error messages.
Chunked Uploads
Simulate chunked transfer behavior to test resumable upload implementations and verify chunk reassembly logic.