multi-algorithm · streamed · local only

File Checksum Calculator

Drop any file and get its SHA-256, SHA-512, SHA-1, MD5 and CRC32 checksums in a single pass — computed locally, never uploaded.

All files are processed locally in your browser — your data never leaves your device.

Or drop a file

Drop a file here or click to browse Large files supported — streamed in chunks, never uploaded

Or hash text instead

Verify any file's integrity

A file checksum is a digital fingerprint: hash the file, and if your result matches the value the publisher listed, your copy is byte-for-byte identical to theirs. This file checksum calculator computes SHA-256, SHA-512, SHA-1, MD5 and CRC32 — and because download pages differ in which algorithm they publish, you can select several and get them all from a single read of the file.

Large files are the whole point of this tool, so it is built to stream: the file is read in 8 MB chunks and fed through every selected hash incrementally. A 700 MB ISO or a multi-gigabyte video hashes with steady progress and minimal memory use, and the page never freezes. And since everything runs inside your browser, the file itself never travels anywhere — all files are processed locally in your browser — your data never leaves your device.

How to verify a download

Find the checksum on the download page (look for "SHA-256", "sha256sum", "MD5" or a .sha256 / CHECKSUMS file).
Drop your downloaded file here and tick the matching algorithm.
Compare the result against the published value with the hash compare tool — a match means the file is intact.

Also try our: Hash Compare Tool · SHA256 Hash Generator · MD5 Hash Generator

§ Frequently Asked Questions

Are my files uploaded to a server?

No. All checksums are calculated locally in your browser. Your files never leave your device.

How large a file can I check?

Files are streamed in small chunks, so files of several hundred megabytes to multiple gigabytes can be hashed without exhausting memory or freezing the page.

Which checksum should I use to verify a download?

Use whichever algorithm the download page publishes — most modern sites list SHA-256. If several are listed, matching any one of them confirms integrity; SHA-256 gives the strongest guarantee.

Why did my checksum not match the published value?

A mismatch usually means an incomplete or corrupted download — try downloading again. It can also mean the published checksum is for a different version, or in rare cases that the file was tampered with.

Other Hash Tools

Checksum Calculator MD5 Hash Generator SHA256 Hash Generator SHA512 Hash Generator SHA1 Hash Generator CRC Calculator HMAC Generator Hash Compare Tool