Free File Checksum & Hash
MD5, SHA-1, SHA-256 and SHA-512 of a file.
What is the File Checksum & Hash?
When you download software, an ISO or an important file, the publisher often lists a checksum next to it — a fingerprint that proves the file arrived intact and untampered. Comparing it by hand means finding a command-line tool; most people skip it, which is exactly when a corrupted or altered download slips through.
This tool computes a file's checksum in your browser and checks it against the expected value. The file is never uploaded.
Last updated: Sep 1, 2026
What does this tool do?
You pick a file and it computes four hashes — MD5, SHA-1, SHA-256 and SHA-512 — reading the file locally. Paste the checksum the publisher provided into the verify box and it tells you instantly whether it matches, confirming the file is genuine and undamaged.
SHA hashes use the browser's built-in Web Crypto; MD5 is computed in-page. Nothing leaves your device.
Key features
Four algorithms
MD5, SHA-1, SHA-256 and SHA-512.
One-click verify
Paste an expected checksum to compare.
Any file
Works on any file type.
Copy each hash
Grab a value to paste elsewhere.
Private
Read locally; never uploaded.
Example
Common use cases
- Downloaders — Verify installers, ISOs and archives.
- Developers — Confirm build and release artifacts.
- IT & security — Check files against known-good hashes.
- Publishers — Generate checksums to publish.
- Anyone — Make sure a download isn't corrupted.
- Privacy-conscious — Hash sensitive files without uploading.
Benefits
- Verify downloads without command-line tools.
- Four algorithms cover any published checksum.
- Instant match / no-match verdict.
- The file never leaves your device.
Tips
- Match the algorithm to what the publisher listed — a SHA-256 value won't equal an MD5 hash.
- Prefer SHA-256 where offered; MD5 and SHA-1 can be deliberately forged, so they prove accidental corruption more than tampering.
- Checksums are case-insensitive; the tool ignores case when comparing.
- If it doesn't match, re-download — a single flipped bit changes the whole hash.
- For very large files, hashing may take a few seconds as the file is read locally.
Common mistakes to avoid
Comparing different algorithms
Fix: A no-match often just means you pasted a SHA value against MD5 — match the algorithm.
Trusting MD5 for security
Fix: MD5/SHA-1 detect corruption but can be forged; use SHA-256 to guard against tampering.
Worrying about case
Fix: Checksums are case-insensitive; the comparison ignores case.
Assuming the file is uploaded
Fix: It isn't — it's read and hashed locally in your browser.
How it works
- 1
Choose a file
It's read locally, never uploaded.
- 2
Get the hashes
MD5, SHA-1, SHA-256 and SHA-512.
- 3
Verify
Paste an expected checksum to compare.
Frequently asked questions
No — the file is read and hashed entirely in your browser and never sent to a server, so it's safe for private files.
Compute the file's checksum here, then paste the checksum the download's publisher listed into the verify box. A match means the file is intact and unaltered.
Use whichever the publisher provides. SHA-256 is the modern standard; MD5 and SHA-1 are common for legacy verification but are weak against deliberate tampering.
No — the file is read and hashed entirely in your browser and never sent to a server, so it's safe for private files.
Compute the file's checksum, then paste the value the publisher listed into the verify box. A match means the file is intact and unaltered.
Whichever the publisher provides. SHA-256 is the modern standard; MD5 and SHA-1 are common for legacy verification but weaker against deliberate tampering.
Yes — free, no sign-up.
Conclusion
Confirm a download is genuine and undamaged in seconds — compute MD5, SHA-1, SHA-256 and SHA-512 locally and check against the published value, with nothing ever uploaded. Match the algorithm, prefer SHA-256, and re-download on any mismatch.
How-to guides
- How to Zip a File (Compress and Combine)Learn how to zip files and folders on Windows and Mac — to shrink them for email, bundle many files into one, or password-protect a sensitive archive.
- How to Encrypt a File to Keep It PrivateLearn how to encrypt a file so only you can open it — the methods for documents, archives and whole drives, and how to verify a file hasn't been tampered with.
- How to Back Up Your Data (the 3-2-1 Rule)Learn how to back up your files properly with the 3-2-1 rule — three copies, two types of storage, one offsite — so you never lose photos or documents again.