Free Online Hash Checker — MD5, SHA-256, BLAKE3 & 13 Algorithms
How to Verify a File Hash in 3 Steps
Step 1 — Choose an algorithm. For most modern security use cases, SHA-256 is the recommended default. BLAKE3 is faster and just as secure. Avoid MD5 and SHA-1 for any security purpose — they are cryptographically broken.
Step 2 — Paste text or upload a file. The hash is computed in your browser using the Web Crypto API for SHA algorithms and hash-wasm for MD5/BLAKE/RIPEMD/Keccak. For large files (>100 MB), the hash is computed after all chunks are read, so the UI may briefly freeze during the final digest.
Step 3 — Compare against the expected hash. Use the Verify mode to automatically check whether a downloaded file's hash matches the value published by the source. If they differ, the file has been corrupted or tampered with — re-download from a trusted mirror or contact the publisher. Tip: use the multi-algorithm mode to see all 13 hashes at once, and note that files larger than 100 MB take longer because we stream them in 1MB chunks and then run the final digest.
Whenever you download software, firmware, or sensitive documents, take ten seconds to verify the hash. A mismatched SHA-256 or BLAKE3 hash is the only reliable way to detect tampering, corruption, or man-in-the-middle attacks. For day-to-day file integrity checks, use our free online hash checker above — all computation happens locally in your browser, so your data never leaves your device.
Frequently Asked Questions (FAQ)
A: A hash is a unique digital fingerprint of a file or text. Verifying the hash confirms that a downloaded file matches the original — no corruption, no tampering, no man-in-the-middle modification. Software vendors, Linux distributions, and security researchers all publish hash values so users can confirm integrity.
A: No. All hash computation happens entirely in your browser using the Web Crypto API and the hash-wasm library. Your text and files never leave your device. You can verify this by checking the network tab — only the page itself loads, no data is uploaded.
A: MD5 is cryptographically broken for security purposes (collisions can be generated), but it remains useful for non-security file integrity checks and for verifying legacy hash values published by older systems. We display a warning whenever you compute an MD5 hash.
A: All three are cryptographically secure hash algorithms with no known practical attacks. SHA-256 is the most widely adopted standard. SHA-3 uses a different internal structure (Keccak sponge) and is standardized by NIST. BLAKE3 is the fastest of the three on modern hardware and is increasingly popular for new applications.
A: Yes, up to 1 GB. Files are streamed in 1MB chunks so memory stays bounded, and the page stays responsive during reading. For files above 1 GB, we recommend using a dedicated command-line tool like sha256sum (Linux/Mac) or Get-FileHash (Windows PowerShell).
A: Paste the file or text into the Hash Checker above, select the matching algorithm (MD5, SHA-256, BLAKE3, etc.), and use the Verify mode to compare against the published hash. If the values match, the file is intact and authentic. If they differ, do not open the file — re-download from a trusted mirror or contact the publisher. This is the standard integrity check used for software downloads, firmware updates, and sensitive document transfers.
A: A hash is a fingerprint, not a verdict: a hash alone cannot prove a file is clean, but it can flag one. Compare the file's hash against the vendor-published value to confirm authenticity. You can also search the hash in VirusTotal or similar malware databases — if a known malicious sample matches, the file is flagged without you ever uploading it.
A: Each operating system has a built-in command: on Windows use certutil -hashfile file.exe SHA256 (or PowerShell Get-FileHash), on macOS shasum -a 256 file.dmg, and on Linux sha256sum file.tar.gz. Then compare the output with the SHA-256 checksum published on the software's official download page. For a quick check, paste the file into this Hash Checker instead.
A: Stop — do not install or run the file. A mismatch means the download was corrupted or tampered with in transit. Re-download from the software's official site or GitHub release page, verify again, and only proceed when the hash matches exactly. Also double-check that you selected the right algorithm and downloaded the correct version.
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