One fingerprint per file
Know exactly
what's inside your files.
FolderManifest computes SHA-256, SHA-1, and MD5 checksums for single files or entire folder trees — locally, in bulk, with a manifest you can re-verify any time.
Free 7-day trial · No credit card · Windows, macOS & Linux
0
hashed
3
algorithms
100%
local
0
same hash
Three algorithms
SHA-256, SHA-1, and MD5 in one pass
Bulk-ready
hash files by the thousands or entire folder trees
Offline
nothing uploads — hashing happens on your machine
Scriptable
CLI with stable exit codes and JSON output
Why people hash files
A fingerprint that can't lie.
A checksum condenses every byte of a file into a short digest. Identical files, identical digest. One changed byte, completely different digest. That's the whole trick — and it's enough.
01 / DOWNLOADS
Is the file you downloaded?
Publishers publish SHA-256 hashes next to installers. Calculate yours and compare — if they differ, the file was corrupted or tampered with. Don’t run it.
02 / BACKUPS
Prove the copy is clean
A backup that silently corrupted is worse than no backup. Hash the source, hash the copy, compare manifests — byte-level proof the archive is intact.
03 / EVIDENCE
Data that holds up
Research datasets, legal holdings, audit exports — a checksum manifest dated today proves the files were exactly these bytes at this time.
How it works
Hash. Export. Prove.
1
Point at your files
Drop in a file, pick a folder, or feed the CLI a list. Local disks, USB, NAS, mounted cloud drives.
2
Hash instantly
SHA-256, SHA-1, and MD5 are computed locally in one multi-threaded pass. Nothing leaves your machine.
3
Export the manifest
Save a per-file checksum report — CSV, JSON, or HTML — and re-verify it any time to prove nothing changed.
installer.exe → 9f2c…e81b
matches publisher's hash ✓
dataset-v3.csv → 4ab7…0d3f
archived with backup · re-verified ✓
contract.pdf → c19d…77a0
differs from yesterday's manifest — review
The manifest habit
Hash today.
Verify forever.
A checksum only proves a moment. A manifest proves every moment after it: re-run verification whenever you want and see exactly which files changed, appeared, or vanished since the last run.
hash · export · re-verify · repeatOne license · Everything included
$39 once
The checksum calculator ships inside FolderManifest. No subscription, no upsells.
- Checksum calculator — SHA-256, SHA-1, MD5
- Whole-folder manifest generation
- One-click re-verification & drift alerts
- Duplicate finder with one-click undo
- CLI for scripts, schedulers & agents
30-day money-back guarantee · All features unlocked in trial
Questions
Before you hash
What is a checksum?
A checksum is a short fingerprint computed from a file’s contents. Change one byte anywhere in the file and the fingerprint changes completely. SHA-256 is the modern standard; MD5 and SHA-1 are older algorithms kept for compatibility.
Which algorithm should I use?
Use SHA-256 for anything new — verification, integrity, duplication checks. Use MD5 or SHA-1 only when an external system or older tool still requires them.
Can I checksum entire folders, not just files?
Yes. FolderManifest walks a folder tree, hashes every file, and writes a manifest — a complete checksum report you can re-verify any time to prove nothing changed.
Can I calculate checksums in bulk?
Yes. Select hundreds or thousands of files, or generate a whole-folder manifest in one run. The CLI can script it and schedule it with Task Scheduler or cron.
Is there a free online checksum calculator?
Yes — the FolderManifest Checksum Calculator runs in your browser, computes SHA-256, SHA-1, and MD5 locally, and uploads nothing. Try it free, no sign-up.
Is the checksum calculator included in the trial?
Yes. The seven-day full-access trial includes the calculator, folder manifests, integrity monitoring, duplicate finding, and the CLI. One $39 lifetime license keeps everything.
Related
Related guides & free tools
Compute a hash right now in your browser, or go deeper on algorithms and verification.
Fingerprints in seconds
Hash anything. Prove everything.
Single files or whole trees — get SHA-256, SHA-1, and MD5 digests plus a manifest you can re-verify forever.
No credit card · $39 once after · 30-day money-back