🔒 Your file is processed entirely in your browser — it never leaves your device.
The HDF5 WebAssembly engine loads only after you choose a file.
Open HDF5 files without Python
Drop an .h5, .hdf5, .he5 or NetCDF-4 file to browse nested groups and datasets, inspect metadata, select a multi-dimensional slice, and export it. The file stays on your device.
A private HDF5 workflow
Inspect scientific containers without setting up Python, h5py or HDFView.
Nested group browser
Expand the HDF5 hierarchy and inspect datasets with their shape, data type, units and attributes.
Multi-dimensional slices
Pin leading dimensions and preview one numeric 2-D slice instead of loading an entire dataset into the page.
Local by design
libhdf5 runs as WebAssembly in a dedicated browser worker. Your file is never uploaded.
CSV and JSON export
Download the selected dataset slice for spreadsheets, notebooks or application pipelines.