Checksum-Aide is a free Windows utility from Red Regent Software that helps you verify the integrity of your files using industry-standard checksums and hashes, such as MD5 and SHA variants.
By comparing a file’s calculated checksum with a known, trusted value, you can quickly confirm that downloads are complete, that files have not been corrupted in transit, and that they have not been tampered with.
Checksum-Aide is designed to be lightweight, easy to use, and completely free of bundled toolbars, adware, or other unwanted extras.
- Multiple hash algorithms – Calculate CRC32B, MD5, and several SHA variants so you can match whatever checksum the download site provides.
- Single files or batches – Verify one file at a time or run checksums on a selection of files in a single operation.
- Share data between applications – Drag and drop data between Checksum-Aide and other applications.
- Copy files from Windows Explorer – Use drag and drop to copy files to Checksum-Aide.
- Export results to CSV format – Save checksum lists for your records or to share with colleagues.
- Safe, lightweight, and free – No registration required, no bundled software, and a small footprint on your system.
- Verifying downloaded installers and ISOs
1. Download the installer or ISO file.
2. Copy the checksum value from the download page.
3. Use Checksum-Aide to calculate the checksum of your downloaded file.
4. Compare the two values to confirm the file is genuine and uncorrupted. - Checking backups over time
1. Generate and save checksum lists for important folders.
2. At a later date, re-run checksums on the same folders.
3. Compare results to detect accidental changes, corruption, or missing files. - Confirming file transfers
1. Generate checksums for files before copying them to external drives or network locations.
2. After the transfer, calculate checksums on the destination files.
3. Match the values to confirm the transfer completed correctly.
Supported operating systems
Checksum-Aide is designed for modern versions of Microsoft Windows. It runs on current desktop editions of Windows and does not require any additional frameworks beyond what is normally installed.
Hardware and disk space
The program has a small footprint and requires only a modest amount of disk space for the installer and installed files. Any reasonably up-to-date Windows PC that can run standard desktop applications should be sufficient.
Installation overview
- Download the Checksum-Aide installer from the official Red Regent Software website.
- Locate the downloaded installer file and double-click it to start the setup wizard.
- Review and accept the license terms, then choose the installation folder if you want to change the default.
- Complete the wizard and, once finished, launch Checksum-Aide from the Start menu or desktop shortcut.
Checksum-Aide does not require an active internet connection to calculate checksums after it has been installed.
Always download Checksum-Aide directly from the official Red Regent Software website to ensure you receive the authentic, malware-free installer.
On the download page, you will see checksum values published for the current installer. After downloading, you can use Checksum-Aide or another checksum tool to confirm that the installer on your system matches the published values.
If the checksums do not match, do not run the installer. Instead, delete the file and try downloading again or contact Support for assistance.
Checksum-Aide focuses on widely used algorithms such as CRC-32B, MD5, and SHA variants so you can verify most downloads and files you encounter.
If the checksum you calculate does not match the expected value, do not open or run the file. Delete it, download a fresh copy from the official source, and verify again. If mismatches persist, contact Red Regent Software Support or the maker of the corrupted software.
Yes. Checksum-Aide is designed to run in the background. For very large files, calculations may take longer, but you can continue using your PC for other tasks.
Visit the Support page for more information and to submit an inquiry request, support email, or WhatsApp message.
| Version | Release highlights |
|---|---|
1.1.1.0 | Updated About screen to include CPU architecture (32‑bit/64‑bit) in the product name, fixed the portable-mode bug that placed the settings file in the wrong location, and implemented various minor code improvements. |
1.1.0.0 | The release adds drag-and-drop support for files and text, a “Copy Hash” toolbar button, popup context menus in the Text and File tabs for copy/paste, and a “Keep main window On Top” preference to improve drag-and-drop; it also accepts a command-line file argument so dragging a file onto the program icon launches Checksum‑Aide, checks file access privileges (including Admin-required files) before opening, updates and redesigns the help system and documentation, improves the Setup program (including 32 versus 64‑bit detection) and the Setup software, and includes miscellaneous code improvements and enhancements. |
1.0.1.0 | The system requirements have been updated to require Internet Explorer 7 or later to support the online help system, and a bug has been fixed so that files with embedded commas in their names are handled correctly. |
1.0.0.0 | Initial public releases of Checksum-Aide with core checksum verification features. |