Identify a file and compare its bytes
File Inspector & Hash reads a local file's size, supported signatures and image-header properties, then calculates its SHA-256 digest. It is useful when a download has an unexpected extension, a transfer needs an integrity check or you want to compare a saved output with a known reference. It does not upload the file to a scanning service or decide whether the content is safe to open.
Choose one file and wait for the inspection and streamed hash calculation. Large files can take longer because every byte must contribute to the digest. The filename can help you organize the task, but the tool does not treat an extension as conclusive proof of what the file actually contains.
A signature is a clue about format
Many formats begin with recognizable byte sequences or contain structures that help identify their family. A reported signature can reveal that an apparent JPG is actually another format or that a file is not the type its name suggests. That is useful evidence, but it is not a full parser validation of every object inside the file.
Some formats have ambiguous, shared or incomplete identifying patterns. A supported header inspection can report dimensions or related properties without decoding every pixel or understanding every embedded structure. An unknown result does not establish that a file is corrupt; it can simply be outside the inspector's recognition scope.
Do not solve a mismatch by renaming the extension and assuming conversion has occurred. If a recipient needs a genuine JPEG or PDF, use an appropriate conversion workflow and verify its actual output. A correct label should describe the bytes rather than conceal a disagreement between name and signature.
What SHA-256 equality establishes
A SHA-256 digest is a compact value calculated from the file's bytes. If it matches a trusted expected digest for the intended file, it provides strong evidence that the bytes are the same. This is useful for checking a downloaded package, a copied encrypted container or an output that should remain byte-identical during transfer.
The word trusted matters. A digest supplied beside a malicious file by the same untrusted source does not independently establish authenticity. It can show that your copy matches that source's copy, not that the source is legitimate. Obtain the expected value through the appropriate verified channel when authenticity is part of the question.
A hash also does not explain why files differ. A metadata change, a single altered pixel, a different encoder or a completely different document can all produce a different digest. Two photographs that look identical can have different file bytes. Use a visual or metadata tool when those narrower differences are what you need to understand.
Use the expected-digest field carefully
Enter the intended SHA-256 reference in the optional expected-hash field. A SHA-256 value is normally represented by sixty-four hexadecimal characters. Check that you did not copy a digest for another file, an extra label or only part of the value. A mismatch should remain visible rather than being corrected by replacing the reference with the newly calculated result.
Use Copy actual hash when you need to record the observed digest. Keep it associated with the correct file and purpose. A list of hashes without clear names or versions is difficult to use later, particularly when several similarly named outputs exist in a download folder.
If you are documenting a failed transfer, retain both the expected value and the observed mismatch. Do not erase the earlier evidence merely because another attempt succeeds. The useful conclusion is that a particular saved copy did or did not match its reference, not that every transfer route is now certified.
Integrity is not malware detection
A known digest does not tell the inspector whether a file contains malicious content. A harmful program has a perfectly valid SHA-256 value. The tool does not execute files, perform antivirus analysis, validate signatures from every publisher or issue a security certificate.
Likewise, image properties are not privacy conclusions. Width, height and format can be useful without telling you whether a photograph contains location metadata or a visible identifier. Image Inspector provides richer supported image metadata, while Image Privacy Check offers optional visible-content suggestions within its own limits.
A file can also be authentic but inappropriate to share. A correct copy of a private report remains private. Hash equality is evidence about bytes, not consent, rights, confidentiality or suitability for a particular recipient.
Streaming keeps the task bounded, not effortless
The hash is read in chunks rather than requiring a configured whole-file byte ceiling. That is different from a promise of unlimited file size. Available browser resources, storage access and read errors still matter. A large file can take time, and the fact that it was selected does not prove every byte can be read successfully.
The inspection handles one file at a time. Keep the task clear and allow the result to settle before choosing another file. Do not interpret a previous file's digest as evidence for a newly selected source simply because their filenames look similar.
Creative bytes remain in the browser workflow. Application code still loads from the site, and local processing does not protect against a compromised endpoint or an extension that already has access. Avoid posting a report containing private filenames or identifying properties without considering what it reveals.
Finish with a specific conclusion
Record the actual format clues, relevant properties, calculated digest and whether it matched the intended reference. If the purpose is a transfer check, calculate the digest of the saved destination file rather than an earlier in-memory source. A download request is not proof of complete saving, and an empty or partial file will not match the intended bytes.
For protection before transfer, Private File Encryptor is a separate passphrase-based workflow. For image appearance, Compare Images evaluates decoded pictures. Choose the evidence that answers your question and state its limit plainly rather than turning a successful hash comparison into a universal claim of safety.