0x56erify is a minimal, offline-first checksum verification tool for Android.

Pick a file with the system document picker, compute its SHA-256 or SHA-512
checksum, and compare it against a hash you paste in (for example, one
published alongside a download) to confirm the file wasn't corrupted or
tampered with.

Features:

Pick any file using Android's built-in Storage Access Framework picker
Compute SHA-256 or SHA-512 checksums
Streamed hashing: large files are never fully loaded into memory
Copy or share the computed hash
Paste an expected hash and get a clear MATCH / MISMATCH result
Case-insensitive, whitespace-tolerant hash comparison

Privacy and permissions:

All processing happens entirely on-device
No network access, no INTERNET permission, no analytics, no ads, no accounts
No broad storage permissions - files are accessed only through the system
picker for the duration of the operation
No proprietary or Google Play Services / Firebase dependencies

0x56erify is free and open source software, released under the Apache
License 2.0.