Fast Sum

Fast Sum is an application for calculating and verifying file checksums. The software allows generating MD5, SHA-1, SHA-256, and other cryptographic algorithm hash codes to confirm file authenticity and integrity. The tool is used to detect unauthorized modifications, data corruption, and to verify that downloaded files match the originals.

★★★★★

5.0(1 ratings)

• Multiple algorithm calculation. Fast Sum supports the most commonly used hash algorithms: MD5, SHA-1, SHA-256, SHA-384, SHA-512, and CRC32. This variety provides verification options for different security needs and compatibility with various standards.
• Checksum verification. The application allows comparing calculated hashes with predefined reference values. The system clearly shows whether files match or present discrepancies in their content.
• Command line interface. Includes a CLI version for automated operations and batch processing. This feature facilitates integration into scripts and automated processing systems.
• Graphical user interface. Offers a visual interface for users who prefer mouse operations. The GUI presents organized options and clearly visible results.
• Batch processing. Capability to process multiple files simultaneously. This function saves time when verifying groups of files or entire directories.
• Windows Explorer integration. Adds options to the context menu for quick access to functions. Users can right-click any file to calculate its hash.
• Report generation. Creates text documents with verification results to maintain records. Reports include timestamp, file name, algorithm used, and checksum result.
• File comparison. Function to compare two files using their hashes without needing reference values. Identifies differences between file versions or copies.
• Algorithm customization. Preferential selection of hash algorithms for different file types. Users can configure default algorithms for specific workflows.
• Portability. Portable version that does not require installation and runs from USB devices. Maintains full functionality without leaving traces on the host system.
• Drag and drop support. Allows drag-and-drop operations in the graphical interface. Users can drag files directly into the application window.
• Security updates. Implementation of updated cryptographic algorithms according to current standards. Maintains compatibility with modern verification requirements.

Fast Sum was developed by Kirill Zinov. The program was initially created in 2003 to meet the need for a simple yet powerful file integrity verification tool. The application is written primarily in C++ to optimize performance in hash calculation operations, which are computationally intensive. Over the years, the software has undergone numerous updates to add new algorithms, improve the interface, and maintain compatibility with the latest versions of Windows.

Alternatives to Fast Sum:

MySecretFolder

MySecretFolder is a Windows utility that transforms any standard folder into a password-protected and invisible folder to other users of the system.

Price: Free   Size: 1.37 MB   Version: 20.8   OS: Windows

Integrity Downloader

Integrity Downloader is a Windows application designed for downloading files from the Internet.

Price: Free   Size: 1 MB   Version: 2.1.0.7   OS: Windows

RapidCRC Unicode

RapidCRC Unicode is a tool designed to calculate and verify file checksums.

Price: Free   Size: 0.584 MB   Version: 0.3.40   OS: Windows