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File Hash Calculator - local SHA checksums for uploaded files

Compute SHA-1, SHA-256, SHA-384, or SHA-512 hashes for uploaded files entirely in the browser.

  • Runs locally
  • Category Encoding & Crypto
  • Best for Checking file type, size, metadata, and obvious mismatch signals before sharing.
Nothing is uploaded. Up to 50 files / 100 MB per batch; text and Base64 tools use lower browser-memory limits.
Output

What this tool does

File Hash Calculator creates local checksums for releases, backups, legal evidence, vendor handoffs, firmware downloads, and audit notes. Drop one file or a batch, choose SHA-256 or another Web Crypto digest, and export a CSV containing filename, size, and hash. It is designed for the common workflow where you need to publish a checksum, compare two downloaded copies, record what was reviewed, or verify that a file did not change after transfer. The file bytes are read by the browser and never leave the tab.

Tool details

Input
Files + Text + Numbers
The page exposes text boxes, numeric controls, file pickers, or structured inputs depending on the tool.
Output
Live result + Copy + Download
The result area focuses on usable output, with copy, download, or preview actions when supported.
Privacy
Browser-side processing
The main tool logic does not call an external API, so inputs normally stay in the current tab.
Save / share
Shareable URL state
Key settings are encoded in the URL so another person can reopen the same setup.
Performance budget
Initial JS <= 34 KB
No WASM budget is declared, keeping the tool quick to open on mobile.
Best fit
Encoding & Crypto · Developer
Category and role tags drive related tools, internal links, and quick fit checks.

How to use

  1. 1. Input

    Paste or drop your content into the tool panel.

  2. 2. Process

    Click the button. All processing is local in your browser.

  3. 3. Copy / Download

    Copy the result or download to disk in one click.

How File Hash Calculator fits into your work

Use it before upload, handoff, archive, support review, or any moment where a file needs one local check before it leaves your machine.

File jobs

  • Checking file type, size, metadata, and obvious mismatch signals before sharing.
  • Preparing mixed folders for upload, archive, intake, or review.
  • Keeping sensitive files in the browser instead of sending them to an account-based service.

File checks

  • Do not treat the extension alone as proof of the real file type.
  • Review metadata before a file goes to customers, vendors, or a public page.
  • Keep the original file until the copied, converted, or exported result is verified.

Good next steps

These links move the current task into a more complete workflow.

  1. 1 File Checksum Compare Paste an expected checksum, upload a file, and verify SHA digest matches locally before installing or sharing. Open
  2. 2 Duplicate File Finder Upload a batch and find exact duplicate files by SHA hash locally, with a Markdown cleanup report. Open
  3. 3 MD5 / SHA Hash Generator Compute MD5 / SHA-1 / SHA-256 / SHA-384 / SHA-512 hashes, all five at once, browser-only Open

Real-world use cases

  • Publish release checksums

    Hash downloadable assets locally and paste the digest into release notes or verification docs.

  • Record reviewed evidence

    Store filename, size, and digest in an audit table so later reviewers can confirm the exact file.

Common pitfalls

  • A hash proves equality, not safety or trustworthiness.

  • Hashes change when a file is re-saved even if visible content looks similar.

Privacy

Hashing uses Web Crypto locally. Only the digest is displayed; source bytes are not uploaded.

FAQ

Tool combos

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Made by Toolora · 100% client-side · Updated 2026-06-13