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The HDF5 WebAssembly engine loads only after you choose a file.
Convert HDF5 datasets to JSON
Browse an HDF5 hierarchy, select a numeric dataset and slice, then download structured dimensions, coordinates and values as JSON — entirely on your device.
Structured output without native tools
Hierarchy-aware
Find datasets inside nested groups instead of guessing paths.
Slice large arrays
Choose leading dimension indices and export the 2-D field you need.
Application-ready JSON
Keep dimension names, shape, coordinates and values together.
100% local
The HDF5 file never leaves your browser.