Free ToolNothing Is Uploaded

Checksum Verifier for SHA-256 and MD5

Work out the checksum of a file and compare it with the one you were given. Your file never leaves your device: the hashing runs in this browser tab and nothing is uploaded. Once this page has loaded, it keeps working without a connection.

Choose a file or drop it hereSHA-256 is always calculated. The file stays on your device.

Also calculate MD5

Calculating MD5 as well takes longer. MD5 is not collision resistant, so use it only to match a published MD5. Changing this while a file is selected hashes the file again.

Expected checksum (optional)

Upper or lower case and spaces make no difference.

What Is a Checksum?

A checksum is a short string worked out from every byte of a file. A SHA-256 checksum is 64 hexadecimal characters and an MD5 checksum is 32. Change a single byte and the checksum changes completely, so if your checksum matches the one the sender published, you have the same file they had.

MD5 still shows whether a download was damaged, but it is not collision resistant: two different files can be made to share an MD5. Use SHA-256 whenever you have the choice.

Get a SHA-256 Checksum on Your Computer

Replace FILE with the path to your file.

macOS

In Terminal:

shasum -a 256 FILE

Windows

In Command Prompt or PowerShell:

certutil -hashfile FILE SHA256

Linux

In a terminal:

sha256sum FILE

Checksums on Dropvi

When you send a file of up to 500 MB with Dropvi, the sender's browser works out its SHA-256 as the upload completes, and the download page shows it. Dropvi's servers do not check that value, so it is the checksum the sender's browser calculated. To check a download, copy the SHA-256 from the download page and paste it into the expected checksum field above.

Send the Files with Dropvi

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