File Checksum Calculator

Choose a local file and algorithm, hash the file bytes in the browser, then compare the complete digest with a trusted published value.

—File

—Bytes

6Algorithms

ReadyStatus

Choose a file to calculate checksums locally.

SHA-256/SHA-384/SHA-512 are modern cryptographic digests. MD5 and SHA-1 are retained for legacy comparison and file-identification workflows, not collision-resistant security. CRC32 is an error-detection checksum. The existing single-file limit is 256 MB because standard browser digest APIs are not streaming.

File Checksum: Expected Hash Verification & Manifest Audit

Compare a calculated file checksum with an expected hash, detect the likely algorithm and create verification-ready evidence locally.

Expected checksum

Batch SHA-256 manifest and verification

The primary single-file calculator above remains authoritative for its six algorithms. Use this local batch workspace when you need a reproducible SHA-256 list for several files or want to compare selected files with a saved manifest.

Batch files

Manifest to verify

Files are read only in this browser tab. Batch limits protect browser memory.

Integrity and authenticity are different jobs

connects text/file digests, checksum verification and HMAC workflows. Hashes compare exact bytes; HMAC additionally depends on a shared secret key.

Password-storage boundary

Fast hashes such as SHA-256, SHA-1 and MD5 are not password-storage schemes. Production password storage should use a purpose-built slow password hashing/KDF design with salts and reviewed parameters; legacy algorithms remain here only for compatibility and checksum workflows.

How to use this File Checksum Calculator

Choose a file and let the browser calculate six common checksums. SHA-256 is visually emphasized for modern integrity workflows while legacy algorithms remain available for compatibility checks.

Practical guide and verification

Use the tool first, then apply these checks to verify the inputs, interpret the result, and hand it off without displacing the primary workflow.

Use a checksum from an independent trusted source

A matching digest shows that two byte sequences are identical under the selected algorithm. It does not prove that the file is benign or that the reference checksum itself is trustworthy. Compare against a value published through a source you already trust, ideally separate from the mirror or transfer path you are checking.

Choose the algorithm the publisher actually provides

SHA-256 is a strong modern default for file-integrity comparison, while MD5 and SHA-1 remain common in legacy manifests but are collision-broken for adversarial security use. Do not convert or truncate one digest to make it resemble another. The algorithm name and complete digest belong together in any verification record.

Keep filenames and relative paths in batch manifests

A folder or multi-file check is only reproducible if each digest remains tied to the intended file. Renaming, duplicate basenames, and different relative paths can make a flat list ambiguous. The batch workspace therefore preserves a name with each SHA-256 digest; review duplicates before treating a manifest as a release record.

Remember the browser-memory boundary

The primary tool and batch add-on process selected files locally, but browser hashing can still require substantial memory. Large files or large batches may fail on low-memory devices. For very large artifacts, use a trusted streaming checksum utility on the local machine and compare the resulting digest with the same trusted reference.