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HDFView 3.5.0

Tool for browsing and editing HDF files

filecart Mac Updated Oct 21, 2026
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About HDFView

Tool for browsing and editing HDF files
Release info Update on Oct 21, 2026
Release notes HDFView version 3.5.0

HDFView Changelog
All notable changes to this project will be documented in this file. This document describes the differences between this release and the previous HDFView release, platforms tested, and known problems in this release.

Quick Links
• HDFView releases
• HDFView source
• Getting help, questions, or comments

Contents
• Executive Summary
• New Features & Improvements
• Bug Fixes
• Platforms Tested
• Known Problems

Executive Summary: HDFView Version 3.5.0

Enhanced Features:
• Nested and variable-length compound types: Variable-length sequences of compounds, and compounds with variable-length or nested compound members, can now be opened and displayed.
• Bundled filter plugins: The HDF5 filter plugins shipped with HDFView are now found automatically on every platform.

New Features & Improvements

Major Enhancements
• GH #472 - Variable-length sequences of compound types can now be read. Each sequence is displayed in a single cell, e.g. [{1, 2}, {3, 4}].
• GH #477 - The bundled filter plugin directory is now on the HDF5 plugin search path by default, so datasets written with those filters open without editing the plugin path in User Options. Windows and macOS installers now include the plugin files as well.
• HDFView is now built against HDF 4.4.0 and HDF5 2.2.0, up from HDF 4.3.1 and HDF5 2.0.0.

Bug Fixes

Major Bug Fixes
• GH #165, GH #470, GH #491 - Compound datasets and attributes with variable-length or nested compound members could show error values, drop columns, fail to open, or crash HDFView. They now display correctly, with nested values shown in a single cell.
• GH #475 - Files were always opened read-only in SWMR mode, regardless of the SWMR setting in User Options.
• Windows: other HDF4/HDF5 installations no longer prevent HDFView from starting: HDFView ships its own copies of the HDF4 and HDF5 libraries, but Windows could load a different installation in their place if one was on PATH. Windows DLLs carry no…
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