Yes, absolutely. This tool runs entirely in your browser (client-side). Your HDF5 files are never uploaded to any server.

What is the file size limit?

Since processing happens on your device, the limit depends on your computer's RAM and browser capabilities. Files up to a few hundred megabytes usually work fine.

Can I convert multidimensional arrays?

The tool is optimized for 1D and 2D datasets (tables/matrices). Higher dimensional data will be flattened or may not display correctly in a standard CSV format.

HDF5 to CSV Online Converter | Free, Fast & Secure Tool

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Upload HDF5 File

Drag & drop your .h5 or .hdf5 file here, or click to browse

Processed locally in your browser. No data leaves your device.

Select a dataset

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Select a dataset from the left sidebar to preview and convert.

About HDF5 to CSV Converter

The HDF5 to CSV Online Converter is a powerful, free web tool designed to help researchers, data scientists, and engineers quickly extract data from Hierarchical Data Format version 5 (HDF5) files. Unlike other tools that require software installation (like HDFView) or Python scripting, this tool works instantly in your web browser.

We utilize advanced client-side technologies (WebAssembly and JavaScript) to parse binary files directly on your device. This ensures maximum privacy and speed, as your sensitive data is never uploaded to the cloud.

How to Use

Upload: Click "Select File" or drag and drop your .h5 or .hdf5 file into the upload area.
Explore: The tool will parse the file and display its internal structure (groups and datasets) in the left sidebar.
Select: Click on any dataset (marked with a 📊 icon) to preview its contents in the main window.
Convert: Once the data is loaded, click "Download CSV" to save it to your computer, or "Copy" to paste it into Excel or Google Sheets.

Features

100% Client-Side: Secure processing with no server uploads.
Instant Preview: View your data structure and values before exporting.
Universal Compatibility: Works on Windows, Mac, Linux, and even mobile devices.
Zero Dependencies: No need to install Python, Anaconda, or HDFView.

Frequently Asked Questions

What is an HDF5 file?

HDF5 (Hierarchical Data Format version 5) is a file format designed to store and organize large amounts of data. It is commonly used in scientific research, finance, and engineering to store complex multidimensional arrays.

Why convert HDF5 to CSV?

While HDF5 is great for storage, CSV (Comma Separated Values) is the universal standard for data exchange. Converting to CSV allows you to open your data in Excel, Google Sheets, or import it into other analysis tools easily.

My file is very large, will it work?

This tool runs in your browser's memory. It works best with files up to a few hundred megabytes. For multi-gigabyte files, we recommend using a desktop-based Python script or HDFView.

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