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OpenHashTab is a shell extension for conveniently calculating and checking file hashes from file properties.

• Support for 28 algorithms, seeAlgorithms
• High performance hash calculation
• Native Windows looks
• High DPI screen support
• Long path support*
• Multilingual (Consider contributing to translation!)
• Check hashes against VirusTotal with a button
• Hash checking against a checksum file (Supported: hex hash next to file, *sum output (hex or base64), corz .hash, SFV)
• Hash export to file or clipboard (Supported: *sum output, corz .hash, SFV)
• Optional context menu option for faster access
• File associations and standalone mode

* to the extent Windows and configuration supports it.Enable long paths on 1607+ for better support.

• Windows 7 or later (x86 / x64 / ARM64)
• 1 GB RAM or more (for efficient hashing of more than 512 files at a time)

Most of the actions should be obvious. Some not-so-obvious features are listed here:

• You can select multiple files or folders, all files will be hashed, directories traversed
• Double click hash to copy it
• Double click name or algorithm to copy the line in sumfile format
• Right click for popup menu: copy hash, copy filename, copy line, copy everything
• The counters next to the status text is in the format(match/mismatch/nothing to check against/error)
• Columns sort lexicographically, except the hash column which sorts by match type
• Selecting the tab on a sumfile will interpret it as such and hash the files listed in it.
• If a hashed file has a sumfile with same filename plus one of the recognized sumfile extensions and the option for it is enabled, the file hash is checked against it.

Override Windows language selection

Add aDWORD namedLangIdOverride toHKEY_CURRENT_USER\SOFTWARE\OpenHashTab with your preferredLCID

Disable VirusTotal button for all users on a machine

Add aDWORD namedForceDisableVT toHKEY_LOCAL_MACHINE\SOFTWARE\OpenHashTab with a nonzero value

• CRC32, CRC64 (xz)
• xxHash (XXH32, XXH64)
• xxHash3 (64 and 128 bit variants)
• MD4, MD5
• RipeMD160
• Blake2sp
• SHA-1
• SHA-2 (SHA-224, SHA-256, SHA-384, SHA-512)
• SHA-3 (SHA3-224, SHA3-256, SHA3-384, SHA3-512)
• BLAKE3 (256 bit, 512 bit)
• KangarooTwelve (264 bit, 256 bit, 512 bit)
• ParallelHash128 (264 bit) and ParallelHash256 (528 bit)
• Streebog (GOST R 34.11-12) (256 bit, 512 bit)

Latest release

Latest development build

Development builds

This software is provided completely free of charge to you, however I spent time and effort developing it. If you like this software, please consider making a donation:

• Bitcoin: 1N6UzYgzn3sLV33hB2iS3FvYLzD1G4CuS2
• Monero: 83sJ6GoeKf1U47vD9Tk6y2MEKJKxPJkECG3Ms7yzVGeiBYg2uYhBAUAZKNDH8VnAPGhwhZeqBnofDPgw9PiVtTgk95k53Rd

Translate the project atWeblate

In addition to contributors reported by git, some translations were also contributed by:xprism,@NieLnchn (Simplified Chinese),Niccolò Zanichelli (Italian)

• Visual Studio 2022 (with desktop C++, ARM64, clang-cl)
• vswhere in PATH
• CMake
• InnoSetup

1. Run build_algorithms.ps1
2. Run build_openhashtab.ps1
3. Use Inno Setup Compiler to compile installer.iss

More options and commands can be found in theGitHub Actions workflow

HashTab was a similar purpose proprietary software. While this software has been inspired by it, I was never a user of HashTab and this software contains no code or resources related to it.

All original code in this repo are licensed under the following license, unless explicitly stated otherwise in the file:

Copyright 2019-2025 namazso <admin@namazso.eu>OpenHashTab - File hashing shell extensionOpenHashTab is free software: you can redistribute it and/or modifyit under the terms of the GNU General Public License as published bythe Free Software Foundation, either version 3 of the License, or(at your option) any later version.OpenHashTab is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See theGNU General Public License for more details.You should have received a copy of the GNU General Public Licensealong with OpenHashTab.  If not, see <https://www.gnu.org/licenses/>.

This software also contains or uses code from various other sources, for a complete list seelicense.installer.txt