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File SHA-256

Calculate a SHA-256 checksum for file verification.

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Max 100 MB per file

    File checksum

    Calculates SHA-256 on your device. Requires HTTPS or a supported secure local context. This does not scan files for malware.

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    Free No watermark No sign-up Files never uploaded
    Checking for viruses?A checksum is not a virus scan and not encryption.
    Tool not working?The site must be opened over HTTPS.
    Large file taking long?Every byte must be read.

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    How to use File SHA-256

    1. Select your files.Add any downloaded files you want to check — several at once.
    2. Click File SHA-256.Each file gets a 64-character SHA-256 value.
    3. Download your checksum text file.Save the checksums in the standard “checksum filename” format.
    4. Compare the SHA-256 value.Every character must match the value published by the source.

    About File SHA-256

    When is it useful? File SHA-256 calculates the fingerprint (checksum) of any file. Comparing it with the value published by a software website tells you whether your download is complete and has not been changed.

    Good to know: each file gets a 64-character SHA-256 value, shown on screen and saved in a text file in the standard “checksum filename” format. Several files can be checked at once. A matching checksum provides strong evidence that the files are identical — it is not a virus scan and not encryption. The site must be opened over HTTPS for this tool to work.

    Tips for Better Results

    • Copy the published checksum and compare it carefully — every character must match.
    • Even a one-byte change gives a completely different value.
    • Large files take longer because every byte is read.

    Frequently Asked Questions

    What does a matching checksum show?
    It provides strong evidence that your file is identical to the one published — complete and unchanged.
    Is this a virus scan?
    No. A checksum is not a virus scan and not encryption.
    Why does one changed byte matter?
    Even a one-byte change gives a completely different value.
    Works with: Any file type · checksums published by software websites

    What converts well, and what doesn't

    What you getDetail
    SHA-256 value64 characters per file
    On screenShown for every file
    Text fileStandard “checksum filename” format
    Several filesChecked at once
    Matching checksumProvides strong evidence that the files are identical
    💡 Tip: Compare carefully — every character must match; a one-byte change gives a completely different value.

    Common uses

    DownloadsCheck they are complete.
    SoftwareVerify installers.
    File transfersConfirm nothing changed.
    BackupsCheck copies.
    Comparing filesSame or different.
    RecordsSave checksums.

    Is my file safe?

    Browser processing: your files are processed on your own device and are never uploaded to our server.

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    Guide

    File SHA-256: a complete guide

    What a checksum is

    A SHA-256 checksum is a 64-character fingerprint calculated from every byte of a file. Even a one-byte change produces a completely different fingerprint. Software publishers, Linux distributions, banks and archives publish checksums so you can confirm that a downloaded file is complete and has not been changed.

    How it works

    Add one or more files of any type. Your browser reads each file and calculates its SHA-256 checksum using the built-in Web Crypto feature; nothing is uploaded. The values appear on screen and are saved in a text file in the standard “checksum filename” format, which command-line tools such as sha256sum can check.

    How to compare

    Copy the checksum published by the software website and compare it with the one shown — all 64 characters must match. If they match, your file is byte-for-byte identical to the published one. If they do not, download the file again from the official source.

    What a checksum does not do

    A matching checksum provides strong evidence that the file is the same as the published file; it does not show the file is safe, and it is not a virus scan or encryption. If the website itself was compromised, both the file and its checksum could be fake — download from official sources.

    Good habits

    Verify large downloads such as operating system images, keep the checksum file with archived backups, and note that this tool needs the website to be opened over HTTPS.

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