File Hash Checker
Drop a file to compute MD5 and SHA-1/256/384/512 digests locally — zero bytes uploaded; instantly tell if a download is intact.
>_ USAGE GUIDE
Drop a file into the tool and it computes MD5 plus SHA-1/256/384/512 digests locally, all four algorithms in one pass. Zero bytes are uploaded — the whole computation happens in your browser, so even multi-GB installers never reach any server.
- Drag the file in: hashing starts immediately, streamed in blocks so memory stays flat
- Compare with the published value: match the algorithm the vendor published, usually SHA-256
- Decide: identical means the file is intact; any difference means re-download
The classic use case is verifying a download. When the vendor's site publishes a SHA-256 value, drop the file here and compare at a glance — a match confirms the file arrived exactly as released, a mismatch means corruption or tampering. System images, installers, and important documents all deserve this final check after transfer. The whole operation is read-only: the tool reads bytes and computes digests without ever modifying the file, so it is equally safe to run against firmware images, backup archives, or anything you cannot afford to alter.
>_ FAQ
Q1 · How do I check that a downloaded file is the official original?
Three steps: find the official checksum on the vendor's release page (prefer SHA-256); drop the file here to compute the local digests; compare character by character. A match means the file is identical to the official release; a mismatch means it was corrupted or intercepted in transit — do not install it. Only trust checksums from the official site; values posted in comments or chat groups are not a baseline.
Q2 · Is hashing a large file slow?
Hash throughput is typically in the hundreds of MB per second, so a 1 GB file takes seconds to a dozen or so. The tool reads the file in blocks and streams the computation — the whole file never sits in memory. Keep the tab in the foreground while computing; browsers throttle background pages.
Q3 · If two files have the same MD5, are they the same file?
For everyday verification, close enough — but strictly, methods to construct MD5 collisions are public, so an attacker can craft two different files sharing one MD5. For security-sensitive checks such as system images and executables, rely on SHA-256. MD5 remains fine for non-adversarial duplicate detection and quick comparisons.
Q4 · The published digest uses different capitalization than mine — is that a mismatch?
No, it is only a case difference in the hexadecimal notation; the content is identical. Normalize case before comparing (this tool outputs lowercase). Likewise, make sure you compare the same algorithm: a SHA-1 value will never match a SHA-256 value, and that is expected.
Q5 · Why compute a hash before sending a file to someone?
A hash is a fingerprint. Compute it before sending and share the value; the receiver hashes what arrived and compares. A match proves the transfer introduced neither corruption nor substitution — the cheapest possible integrity guarantee when moving large files over untrusted channels such as cloud drives and chat apps.