AkousaFile Checksum Calculator
Compute MD5, SHA-1, SHA-256, and CRC-32 checksums simultaneously.
About File Checksum Calculator
The File Checksum Calculator computes MD5, SHA-1, SHA-256, and CRC-32 checksums simultaneously for any file entirely within your browser using the Web Crypto API and the File API, so your file is never uploaded to a server. These four algorithms cover the full spectrum of checksum use cases: CRC-32 for fast error detection, MD5 for legacy compatibility, SHA-1 for Git object hashing, and SHA-256 as the modern NIST-recommended standard for cryptographic integrity verification. All four hashes appear side by side for immediate comparison against published values.
How to Use
Drag and drop any file onto the upload area or click to open the file browser — there is no size limit since the file stays entirely on your device. All four checksums begin computing immediately and appear as they complete, with SHA-256 taking slightly longer for large files. Copy any individual hash with a single click, or use Copy All to get a formatted block of all four values for inclusion in release notes, security advisories, or deployment verification scripts.
Common Use Cases
- Developers and sysadmins verifying that downloaded software installers, ISO images, or package archives match the SHA-256 checksums published on the vendor security page before installation
- DevOps engineers generating SHA-256 and MD5 checksums for release artifacts, Docker base images, or binary builds to publish in release manifests and enable downstream integrity verification
- Forensic investigators computing multiple hash values for evidence files to document their integrity state at acquisition time and detect any subsequent modification during analysis
- System administrators detecting file corruption after long-distance SCP or rsync transfers by comparing pre and post-transfer checksums of critical configuration files and binaries
- QA engineers identifying duplicate binary assets in large repositories or build outputs by comparing SHA-256 fingerprints across files that may have different names but identical content