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HDF5 Core Implementation

A binary format reader built from the spec. Event → Gate → Stream. No dependencies. Drop a file to begin.

Drop a file to see the gate pipeline fire

Explorer

Drop .h5 / .hdf5 file here
or click to browse

Search datasets

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Data Inspector

Select a dataset from the tree to inspect its contents.

File Structure

Superblock

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Statistics

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Performance

Superblock Bytes

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Byte Inspector

Gates Fired

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superblock · object-header · dataspace · datatype · layout · btree · snod · heap · deflate Every operation is a gate

HDF5 Core Implementation

A complete HDF5 binary format reader built from the spec, in 63 KB(min) of JavaScript. No native libraries. No WebAssembly. Just bytes.

Supports superblock v0–v3, object headers v1/v2, layout messages v1–v4, dataspace v1/v2, filter pipeline v1/v2, and attribute messages v1–v3. Browser-based — files under 200 MB recommended.

Try it: Drop any .h5 file, browse the tree, click a dataset to read its data.

superblock v0–v3 object headers v1/v2 symbol tables link messages contiguous data chunked data deflate / zlib b-tree v1 fixed array index float32/64 int8–32 gate pipeline viz structural search value search + elimination byte inspector attribute display string datasets heatmap / sparkline sub-op tracing extensible array idx B-tree v2 idx shuffle filter fletcher32 compact layout big-endian swap 5-gate pipeline header hex inspector vlen strings global heap compound types implicit chunk idx

Runs entirely in your browser. No data leaves your machine.