File Checksum Verifier — Step-by-Step Guide
Learn how to use File Checksum Verifier: step-by-step instructions, settings, export options, privacy, limits and troubleshooting.
Open File Checksum VerifierStep-by-step instructions
- Choose one or more files and select SHA-256 or SHA-512.
- Optionally paste the expected checksum beside each file.
- Calculate checksums, review Match, Mismatch or Not provided, then download TXT or JSON.
Processing limits
Up to 20 files, 20 MB per file and 24 MB combined; empty files supported. One file is hashed at a time in a worker.
Formats and important details
SHA-256 produces 64 hexadecimal characters; SHA-512 produces 128. Uppercase expected digests are accepted. Surrounding whitespace is trimmed, while internal spaces, separators, algorithm prefixes and malformed lengths are rejected.
A matching checksum confirms that the calculated digest equals the expected value. It does not establish who supplied the file or prove the file is safe. Obtain expected values from a trusted source.
Native browser Web Crypto runs inside a local worker. Each operation reads at most one 20 MB file into its hashing buffer. Cancel terminates the active worker. HTTPS and a current browser are required. Reports preserve full lowercase digests and original file names as text.
Privacy and downloads
All processing happens on this device. Successful results become available after the normal access confirmation. Keep the page open until processing finishes and save your downloads before leaving.
Processing and privacy
Files and entered content are processed on your device in this browser tab. File contents and results are not uploaded to Helphonic or sent to analytics. The page still contacts Helphonic to load its tools, check access and confirm non-content usage information. Work is not saved to your account; download or copy results before leaving or reloading the page.
Access and current limits
Check the tool page for current access, remaining usage and per-operation limits. File count, per-file size, total size and page limits can depend on your access and can change. Device and processor safety limits still apply when usage is unlimited. A paid pass does not necessarily increase every processing limit.
One successful export counts as one operation. Previewing and editing do not use an operation. Daily allowances reset at 00:00 UTC. Downloads of an already-created result do not count again.
If an operation cannot finish
Use a current browser and smaller inputs if the tab runs out of memory. Some tools download a local processing library or model on first use, so an internet connection is needed even though your content stays on the device.
If the tool reports that access or limits changed, review the current policy and run it again. If usage confirmation is uncertain after an interrupted connection, a retry can count as another operation. Download completed work before reloading; this site does not keep a recovery copy.
Check the current limits
Allowances and per-operation limits can change. The File Checksum Verifier page shows the policy that applies to you. Per-operation safety limits still apply when usage is unlimited. See access passes if a tool or extra usage requires paid access.
For site-wide information, read the privacy policy and security details.