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How to Verify a File SHA-256 Checksum on iPhone

Calculate a file checksum in Fileso and compare it with a trusted SHA-256 value to check whether a download matches.

2 min readFileso

A SHA-256 checksum can tell you whether a downloaded file matches the bytes expected by its publisher. Fileso’s File Checksum tool calculates hashes on iPhone, which is useful for an archive, disk image, or data export received without a desktop computer.

Get the expected value first

Find the SHA-256 value on the publisher’s trusted download page or in the verification material that accompanies the file. Keep track of the exact filename and version. A checksum for a different release will not match even if both downloads are valid.

The algorithm matters. An MD5 value cannot be compared with a SHA-256 result. Fileso offers MD5, SHA-1, and SHA-256; choose the one used by the reference.

Calculate and compare

  1. Finish downloading the file and save it locally in Fileso.
  2. Open Tools → File Checksum.
  3. Select the downloaded file.
  4. Calculate its checksum and inspect the SHA-256 value.
  5. Paste the expected checksum into the verification field, or compare the complete values carefully.

Compare every character rather than only the start and end. Hexadecimal letter case is a display convention; the sequence of hexadecimal digits is what identifies the digest.

What a mismatch means

A mismatch says the files differ. It does not identify why. Check whether you chose the correct version, architecture, archive, and algorithm. Then consider an incomplete download, a modified file, or an error response saved under the expected filename.

Calculate the hash of the original downloaded archive if that is what the publisher hashed. Extracting it and hashing one of its contents is a different comparison.

What a match does not prove

A matching checksum verifies consistency with the reference you used. It does not independently prove who published the file or whether it is safe to run. If a malicious source supplies both a file and its checksum, the pair can still match.

For a personal transfer, calculate a hash before sending and again after receiving to check that the bytes survived unchanged. If you later edit, recompress, or convert the file, expect its checksum to change even when the visible content looks similar.

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