Checksum Calculator
Calculate file checksums via drag-and-drop
Checksum Calculator is a free online tool from BrowserUtils that calculate file checksums via drag-and-drop. It runs entirely in your browser — your data never leaves your device. No account required.
Drop a file here or click to browse
How to use Checksum Calculator
- 1 Paste or type your input into the editor above.
- 2 The tool processes your data instantly — right in your browser, with nothing sent to a server.
- 3 Copy the result with one click or continue editing your input.
About Checksum Calculator
Free online file checksum calculator. Compute MD5, SHA-1, and SHA-256 checksums for any file to verify integrity and detect corruption. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
Checksum Calculator specs
- Runtime
- 100% client-side (browser)
- Built on
- Web Crypto API (SubtleCrypto) for hashing and crypto.getRandomValues for secure randomness
- Cost
- Free — no account, no rate limits, no usage caps
- Browser support
- Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
- Part of
- 299 developer tools on BrowserUtils (100% client-side)
Questions
What is a checksum?
A checksum is a hash value computed from a file's contents. By comparing checksums, you can verify that a file has not been altered or corrupted during transfer.
Is my file uploaded to a server?
No. All checksum calculations happen entirely in your browser using the Web Crypto API. Your files never leave your device.
How do I verify a downloaded file with a checksum?
Drop the downloaded file into this tool, then compare the computed checksum with the one published on the download page. If they match, the file has not been tampered with or corrupted.
Which checksum algorithm should I use?
SHA-256 is the best choice for security verification. MD5 is faster but vulnerable to collisions. Many software distributors publish SHA-256 checksums alongside their downloads.
How large a file can I check with this tool?
The tool processes files in your browser using streaming, so it can handle files of several hundred megabytes. Very large files (multiple GB) may be slow depending on your device.
Can I use checksums to detect if a file was corrupted during download?
Yes, compare the checksum of your downloaded file with the one published by the source. If they match, the file is intact. If they differ, the download was corrupted or tampered with.
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