How to Check MD5, SHA-1, SHA-256 & SHA-512 File Hashes on iPhone

If a download publisher gives you a checksum, you can compare it with the hash of the file on your iPhone.

ShowPro's File Hash Calculator at https://showprosoftware.com/tools/file-hash-calculator calculates four values in the browser:

The selected file is read in browser memory; the hashing operation does not upload the file to a ShowPro hashing server.

How to calculate a hash on iPhone

Which hash should you compare?

Always compare the same algorithm.

A SHA-256 value cannot be compared with an MD5 value, even when both were calculated from the same file.

If the download page publishes SHA-256, compare it with ShowPro's SHA-256 result.

What a matching hash tells you

If your calculated checksum exactly matches a trustworthy checksum published by the source, that is strong evidence that the bytes you received are the same bytes the publisher hashed.

It can detect download corruption, accidental changes, a different file being substituted, or modification after the publisher generated the reference checksum.

A hash match does not by itself prove that the publisher or original file is trustworthy.

MD5 and SHA-1: useful, but not for modern security guarantees

ShowPro includes MD5 and SHA-1 because software archives and legacy download pages still publish them.

Both algorithms have known collision weaknesses and should not be chosen for new security-sensitive integrity schemes.

If a publisher offers SHA-256 or SHA-512, prefer one of those for modern verification.

SHA-256

SHA-256 is widely used for download verification and produces a 256-bit digest represented as 64 hexadecimal characters.

For most verify-this-download workflows, SHA-256 is the most common modern choice.

SHA-512

SHA-512 produces a 512-bit digest represented as 128 hexadecimal characters.

ShowPro calculates it alongside the other hashes automatically.

How ShowPro calculates the values

The current implementation reads the file in 10 MB chunks so it can show read progress.

Those chunks are then combined into a complete in-memory buffer.

MD5 is calculated with ShowPro's JavaScript MD5 implementation. SHA-1, SHA-256, and SHA-512 use the browser's Web Crypto digest API.

Because the SHA operations use the complete file buffer, very large files can require substantial memory.

For multi-gigabyte files, a native desktop hashing utility may be more practical.

Why a downloaded file can have a different hash

A mismatch means the bytes are not identical to the bytes used to create the reference hash.

Common causes include the file being updated while the published hash was not, download corruption, choosing the wrong file/version, hashing an extracted file instead of the archive, packaging or line-ending changes, or comparing against a different algorithm.

Do not partially compare a hash. The full expected digest should match.

Privacy and local processing

The hash calculation reads the selected file in your browser.

The file itself is not uploaded to a ShowPro hashing endpoint.

Normal website traffic, analytics, advertising, and billing are separate from the browser-local file-processing step. See https://showprosoftware.com/privacy#local-processing.

FAQ

Can I calculate a file hash in Safari without installing an app?

Yes. ShowPro performs the current hashing workflow in browser JavaScript and Web Crypto.

Does the tool upload my file?

The selected file is read locally for hashing rather than uploaded to a ShowPro hashing server.

Why does ShowPro include MD5?

Legacy publishers still provide MD5 checksums. It remains useful for non-adversarial byte comparison but is not recommended for new cryptographic security uses.

Does ShowPro calculate SHA-512 too?

Yes. The current tool calculates MD5, SHA-1, SHA-256, and SHA-512.

Can I hash a huge file?

Practical limits depend on Safari and device memory because the current implementation ultimately combines the file into one in-memory buffer.