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Privacy

Local File Hash Checker

Details

How to use Local File Hash Checker

What the tool does, how to run it, and what to expect from the result.

How to check a file hash

To check a file hash, choose a local file and the tool computes its SHA-256, SHA-1, and MD5 checksums right in your browser. You can then paste a known checksum to compare, and the tool tells you whether it matches the file you selected.

All hashing happens locally on your device, so the file is never uploaded to a server. This makes it a private, fast way to confirm a download was not corrupted or tampered with, or to verify two files are identical, without trusting an external service with your data.

  • Select a local file
  • Read the computed SHA-256, SHA-1, and MD5 hashes
  • Paste a known checksum to compare (optional)
  • Confirm whether the hashes match

When to use a file hash checker

A file hash checker is useful whenever you need to verify integrity: confirming a downloaded installer or archive matches the checksum the publisher listed, checking that a file transferred without corruption, or proving two copies of a file are identical byte-for-byte.

SHA-256 is the most common modern checksum and the safest choice for verification. SHA-1 and MD5 are included because many older downloads still publish those values, even though they are weaker. Matching the algorithm the publisher used lets you compare against their listed checksum directly.

Tips

Getting a better result out of Local File Hash Checker

Specific settings and thresholds, not general advice.

  • Every run computes SHA-256, SHA-1 and MD5 from the same buffer, so you do not need to know which algorithm the publisher used before you start.
  • Paste the vendor checksum into the compare box and the tool reports which of the three matched. The compare value is trimmed and lowercased first, so an uppercase checksum copied from a release page still matches.
  • A matching SHA-256 proves the bytes are identical to the bytes the checksum was made from. It does not prove who made the file, and it does not prove the file is safe.
  • MD5 and SHA-1 are both broken for collision resistance. Treat them as corruption checks and use SHA-256 when the real question is whether someone tampered with a download.
  • The file is read fully into memory with file.arrayBuffer() before hashing, so a multi-gigabyte archive can exhaust the tab. Hash very large files with a native tool instead.
Limits

What Local File Hash Checker does not do

The honest boundary, so you do not lose time finding it yourself.

  • One file per run. There is no folder mode and no batch queue.
  • Three algorithms only: SHA-256, SHA-1 and MD5. No CRC32, SHA-512 or BLAKE3.
  • No signature verification. It does not check GPG, PGP or code-signing certificates.
  • The input is a file picker, not a text box. It does not hash pasted strings.
Reference

Terms used on this page

Short, plain-language definitions for the formats and settings above.

Privacy & securityHashingHashing turns any input into a fixed-length string of characters using a one-way function — you cannot reverse a hash back into the original data. It is used to store passwords safely, verify files have not changed, and detect duplicates.GeneralAPIs & internalsMD5 ChecksumAn MD5 checksum is a 128-bit value computed from a file's exact bytes. Two byte-identical files always produce the same MD5, while changing a single byte produces a completely different value, making it a fast way to detect exact-duplicate files.General
At a glance

Who Local File Hash Checker is for

A quick way to understand who this helps, what it solves, and where it connects next.

Best fit

Developers, QA, support teams, and careful operators verifying files before sharing, archiving, or troubleshooting.

Ideal for

Simple local file verification without opening a terminal or using a separate desktop tool.

FAQ

Common questions

Short answers for the questions people usually have before trying a utility like this.

Is the file hash checker free?

Yes. This local file hash checker is completely free to use with no signup or account required.

Does the file leave my browser?

No. Hashing happens entirely in your browser on your own device, so the file is never uploaded to a server and stays private.

Which hash algorithms are supported?

It computes SHA-256, SHA-1, and MD5, covering the checksums most downloads and publishers use.

Can I compare against a known checksum?

Yes. Paste a known hash and the tool tells you whether it matches the file you selected, verifying its integrity.

Does it work on large files?

Yes. The file is read locally in your browser rather than uploaded, so you can hash large files without sending them anywhere.

Does the file get uploaded anywhere?

No. SHA-256 and SHA-1 are computed with the browser WebCrypto API (crypto.subtle.digest) and MD5 is computed by a JavaScript library running in the page. The file bytes stay in the tab, and the page makes no network request with them. You can confirm this by opening the network panel and hashing a file.

Which hash should I compare against?

Whichever one the source published. Because the tool computes all three, you can paste any of them into the compare box and it will tell you which algorithm matched. If you paste a SHA-256 and it reports a match on SHA-256, the download is byte-identical to the one that was published.

A matching hash means the file is safe, right?

No. It means the file is unchanged since the checksum was generated. If the publisher signed malware, the checksum matches the malware. Integrity and trust are different questions, and a hash only answers the first one.

Why show MD5 if it is considered broken?

Plenty of vendors, mirrors and older release pages still publish only MD5, so you need it to check what they gave you. MD5 is fine for detecting a truncated or corrupted download. It is not fine as evidence that nobody deliberately altered the file.

My terminal gives a different hash than this page. Why?

The most common cause is hashing two different things. Command-line tools hash the exact bytes on disk, so a file that was re-saved by an editor, re-zipped, or downloaded a second time through a proxy that recompresses it will differ. Check the file size shown next to the picker against the size on disk before assuming the tool is wrong.

Is there a file size limit?

There is no fixed cap in the tool, but there is a practical one. The whole file is loaded into memory as an ArrayBuffer, so hashing a file larger than a few gigabytes may fail or crash the tab depending on the device and browser.

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