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Dropvi

Online 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.

Verifier

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.

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 from the Dropvi website, your browser works out its SHA-256 during the upload and encrypts it, as it does the file. The download page decrypts it in the recipient's browser and shows it. Dropvi's servers cannot read or check that value, so it is the checksum the sender's browser calculated. To check a download, open the verifier from the download page, which fills in the expected checksum, or copy the SHA-256 and paste it into the field above. The Dropvi command-line tool checks it for you on every file it downloads from an end-to-end encrypted transfer, whether it was sent from the website or the command-line tool.

Send the files with Dropvi

Dropvi Free sends up to 50 GB per transfer and keeps the link for up to 7 days. You need no account to send a link, and recipients never sign in.

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