HDF5 dataset to CSV
Select one numeric HDF5 dataset and export its values locally.
Drop your files here
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Multiple files welcome · processed one at a time
Select a tool to see its supported formats and conversion limits. Large files may exceed your browser’s memory.
Before processing large files
On phones and tablets, start with files under 20 MiB and keep this tab in the foreground. Video, OCR and 3D operations can use several times the input size in memory. Desktop browsers generally have more room, but the 128 MiB job limit is not a guarantee that every file will fit. Smaller batches reduce memory pressure.
Supported input formats
- Hierarchical Data Format 5 (.h5)
- Hierarchical Data Format 5 (.hdf5)
- Hierarchical Data Format (HDF5 files only) (.hdf)
- NeXus scientific data (HDF5) (.nxs)
Output format
Comma-separated values (.csv)
Support applies to this conversion direction. Check the limits below for features that may change or be discarded.
Compare all supported formats and conversion limits →How to use HDF5 dataset to CSV
- Add your supported file using the chooser or drop zone.
- Review the settings and conversion limits before processing.
- Select Convert files, then download the result.
What to expect
- 100 MB input; 2 million selected elements. Explicit dataset path required. Compound, reference, string and variable-length data unsupported.
- JSON preserves dimensions and dtype in an envelope. CSV contains values only, without headers; rank must be 1 or 2. Attributes are omitted; unsafe integers and non-finite values are rejected.
Engine: h5wasm. The engine may need a first-use download. Your file stays in this browser session.Check conversion engines and offline requirements.
Conversion settings
These settings are available in the converter above.
- Dataset path
- Inspect the HDF5 file and enter an explicit path, such as /measurements. JSON keeps all dimensions; CSV accepts 1D / 2D only.
About this conversion
Is hdf5 dataset to csv free?
Yes. This tool runs on your device without an account or a conversion fee.
Are files uploaded during conversion?
File processing happens locally in your browser. Engines may download their code on first use; your input files are not sent to a conversion server. Read how file privacy works.
What if conversion fails?
Check that the file matches a supported input, review the engine’s limitations and try a smaller representative file. If the engine cannot load, check its engine assets and browser requirements. The app reports failures without switching to a remote converter.
Continue with your output
These tools accept this tool’s output format. Each step has its own settings and fidelity limits.
- Numeric data to HDF5
Create a single selected HDF5 dataset from a numeric matrix or an exported JSON envelope.
- Numeric CSV to Matrix Market
Turn a headerless numeric CSV matrix into sparse Matrix Market coordinate data, omitting zero entries.
- CSV to JSON
Convert CSV locally with an explicit structured-data mapping.
- CSV to TSV
Convert CSV locally with an explicit structured-data mapping.
- CSV to YAML
Convert CSV locally with an explicit structured-data mapping.
- CSV to XML
Convert CSV locally with an explicit structured-data mapping.
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