🔒 Your file is processed entirely in your browser — it never leaves your device.
The HDF5 WebAssembly engine loads only after you choose a file.
Convert HDF5 to CSV in your browser
Open the group tree, choose a numeric dataset, pin any leading dimensions, and download the selected 2-D slice as CSV. No Python, install or upload.
From hierarchical data to rows
Choose one dataset
Browse nested groups and select the array you actually need.
Slice before export
Pin time, level or other leading dimensions before creating CSV rows.
No Python setup
Skip h5py, pandas, conda and native HDF5 libraries.
Private conversion
The source file and generated CSV stay on your device.