Verify that your downloaded Apple firmware package is 100% complete, authentic, and uncorrupted before flashing. Drag and drop your .ipsw or .dmg file below to compute its SHA-256 hash locally in your browser.
or click to browse from your device (.ipsw, .dmg, .zip)
When downloading massive Apple firmware files (typically 5GB to 15GB in size for iOS 27 and macOS 27 releases), transient packet loss, server drops, or Wi-Fi fluctuations can silently introduce corrupt bytes into the download stream.
Attempting to flash a corrupted IPSW restore package via iTunes, Apple Configurator, or Mac Finder often causes your device to crash halfway through restoration. This results in bricked devices, recovery mode loops, or untraceable errors like iTunes Error 14, Error 3194, Error 4013, or Error 9.
A SHA-256 checksum acts as a unique 256-bit cryptographic fingerprint of a file. If even a single byte differs between your local file and Apple's master release, the SHA-256 string will be completely different. Validating your hash before restoring guarantees a seamless installation.
Your files are processed strictly inside your local web browser. Zero network bytes or file data are ever transmitted to external servers.
Built with a 16MB streaming chunk algorithm that processes massive 15GB+ macOS IPSW files without freezing your browser RAM.
Cross-references computed checksums against thousands of indexed official Apple release builds for instant verification badges.
If you prefer using native terminal utilities on macOS, Linux, or Windows, you can calculate SHA-256 digests directly from your command line:
shasum -a 256 /path/to/downloaded_firmware.ipsw
Get-FileHash -Algorithm SHA256 C:\path\to\downloaded_firmware.ipsw
certutil -hashfile C:\path\to\downloaded_firmware.ipsw SHA256
Corrupted IPSW checksums are the primary cause of unexplained restoration failures. Review common error codes below:
Caused by corrupted firmware image payloads during unpacking. Solution: Verify SHA-256 hash and re-download from direct Apple CDN links.
Triggered when device disconnects during flash due to unexpected corrupt RAM sectors in firmware. Ensure cable integrity and verify checksum.
Occurs when attempting to flash an unsigned or modified IPSW build. Verify your build status on our homepage.
Occurs during security check handshake. Using a verified, uncorrupted IPSW prevents timeout errors during restoration.
Yes, completely safe. Your file is read locally using the browser's standard File API and Web Crypto interface. The file contents never leave your computer or transmit across the internet.
If the calculated checksum differs from Apple's official hash, your file is corrupted. Delete the incomplete file, ensure you have sufficient storage space, and re-download directly from official Apple CDN mirrors.
Yes! This tool accepts .ipsw, .dmg, .zip, and .bin packages up to any size.
All database checksums are programmatically validated against official Apple CDN manifests (updates.cdn-apple.com).