Free online hash verifier tool. Supports MD5/SHA1/SHA256/SHA512 algorithms, text and file hash computation, one-click expected value comparison.
TL;DR: Free hash verifier supporting MD5, SHA-1, SHA-256, SHA-384, and SHA-512. Compute file or text hashes locally and compare to an expected digest — data never leaves your browser.
For local tools, open DevTools → Network and search your input — it should not appear in requests.
Next steps
Usage Guide
After downloading an ISO, installer or firmware, how do you confirm it was not corrupted or tampered with in transit? Compare the hash the publisher announced with the hash your local file actually produces — that is all this tool does: drop the file, paste the expected value, auto-compare. The file never leaves your machine.
1. Verify a file
- Drop the file into the upload zone (or click to select); the tool hashes it as a local stream — large files stay local.
- Pick the algorithm matching the publisher (SHA-256 is the mainstream; MD5 is no longer advised for security contexts).
- Paste the official hash into the expected box; the tool compares digit by digit and verdicts instantly.
2. Reading the verdict
Match: the file is byte-identical to what the publisher had (assuming no hash collision) — safe to use. A mismatch means exactly one of two things: the file got corrupted (truncated download, disk error) or it got replaced (tampering) — either way, do not use it; re-download and verify again. Note that comparison is case-insensitive and trims stray whitespace — handled automatically.
3. Three practical reminders
- Fetch the hash over a separate channel: the official page body, a GPG-signed note — never a popup on the same download page, since a compromised page swaps both file and hash together.
- For security-critical downloads (OS images, wallet software) prefer GPG/code signatures over bare hashes: a hash proves consistency; a signature proves origin.
- Browser extensions and chat-app transfers mutate bytes — even "the copy I sent myself" deserves a fresh verification.
- MD5/SHA-1 collisions are practical: under attack a Match is not anti-forgery proof — switch to SHA-256. This tool hashes one selected algorithm at a time, not five digests in parallel.
4. A systematic sweep when verification fails
When hashes refuse to match, it is almost always one of four things: line-ending drift (CRLF/LF rewritten by editors or transport — especially when copying content out of web pages); leading/trailing whitespace (an extra space, a missing one, a BOM); casing (upper vs lower hex does not change the value, but a strict string-compare script will flag it); and algorithm mismatch (comparing a SHA-256 expectation against an MD5 output). This tool normalizes case and whitespace before comparing, eliminating the three superficial classes up front — whatever still mismatches is genuine content difference or corruption.
5. Put a hash gate into your release flow
- Ship the trio: the artifact, a checksums file, and a signature — users verify with a single sha256sum -c.
- Supply-chain floor: verify before executing after download; for high-sensitivity paths graduate to GPG signature verification (hashes catch transport damage, signatures catch tampering).
- In CI, generate SHA-256 for build artifacts automatically and record them in release notes — turning "do I trust this package" into a checkable fact.
6. Large files and browser hashing limits
This page streams the selected file locally to compute a digest — nothing is uploaded. It runs only the algorithm you pick, not five digests in parallel. Background tab throttling can slow multi-gigabyte ISOs; that is scheduler behavior, not a broken hash. When a publisher lists several algorithms, match the one named in the release notes; if several are listed, prefer SHA-256 (or longer) and treat MD5 as legacy compatibility only.
FAQ
MD5, SHA-1, SHA-256, SHA-384, and SHA-512 — one algorithm at a time, so do not expect five digests at once. MD5 runs on SparkMD5 and the SHA family on Web Crypto; pick SHA-256 or stronger for security-sensitive downloads.
Get the hash from the publisher over a separate official channel (never the value offered by the download page popup itself), drop your local file in to compute the same algorithm, and paste the expected value — comparison is digit by digit with case and surrounding whitespace normalized. A match means byte-identical to the publisher's copy; a mismatch means corruption or tampering, and both warrant a fresh download and a re-check.
No. A match only proves the content equals whatever produced the expected digest — it says nothing about the channel. If an attacker swaps the file and the published hash together, or the algorithm (like MD5) admits crafted collisions, a match can mislead. Layer GPG or code signatures on top: hashes catch transport damage, signatures prove origin.
Four usual suspects: an algorithm mismatch (comparing an MD5 output against a SHA-256 expectation), case and whitespace differences (normalized here, but homegrown scripts often false-alarm on them), line endings rewritten in transit, and finally genuine corruption. Also note that files relayed through browser extensions or chat apps change bytes — even your own copy deserves a re-check.
No. The file is streamed and hashed inside the browser, never leaving your machine — a multi-gigabyte image goes through the same flow. If a background tab gets throttled the digest simply takes longer; that is scheduler behavior, not a broken hash.
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