Large File Upload Speed Test

Evaluate Azure Blob Storage upload performance by pushing your own large file to different regions and tracking throughput in real time.

Testing steps
1 Choose the Azure storage region to target. 2 Pick a large test file and tune block size + concurrency. 3 Start the upload and watch progress, timing, and throughput.
Tip: Larger block sizes and higher concurrency may improve performance, but consume more bandwidth and memory.
Recommended: Use files larger than 100 MB for realistic results.
4 MB+ typically works best for large files.
Higher values increase parallel uploads but may be limited by bandwidth.

Select a target region and file before starting the upload test.

Frequently asked questions

How does Large File Upload Speed Test tool work?

The performance test tool:

  • Uploads your test file to temporary Azure Blob storage in your selected region
  • Measures actual transfer speeds accounting for network conditions
  • Calculates and displays detailed performance metrics
  • Automatically removes the test file after completion

Results can vary based on network conditions, file size, and selected parameters.

How should I choose block size and concurrency?

Block Size: Larger blocks (4 MB+) typically work better for files over 100 MB but require more memory.

Concurrency: Higher values can improve speed but may be limited by bandwidth and local resources.

Start with default values and adjust based on your results.

Why do test results vary between runs?

Performance variations are normal and can be attributed to multiple factors:

  • Network path changes and internet traffic conditions
  • Regional network congestion
  • Local network quality and bandwidth availability
  • Distance to the selected Azure region
  • System resource availability

For the most accurate assessment, we recommend running multiple tests at different times and comparing the results.