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  3. Checksum Calculator
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Checksum Calculator

Calculate file checksums and verify integrity (MD5, SHA-1, SHA-256)

Upload a file and calculate its checksum using MD5, SHA-1, or SHA-256. Compare it against an expected value to verify the file has not been corrupted or altered during download or transfer.

Runs in your browser and files never uploadedMore converters & encodersJump to full guide

Related reading

  • Hash Functions Explained: MD5, SHA-256, and When to Use Each14 min read

Initializing in your browser…

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Checksum Calculator: a worked example

You burned an ISO to a USB stick and want to confirm it is bit-for-bit identical to the source before booting it.

File

ubuntu-24.04.iso (selected locally)
Checksum Calculator produces

Checksums

CRC32:   8f3a1b2c
MD5:     b1946ac92492d2347c6235b4d2611184
SHA-256: 9f86d081884c7d659a2feaa0c55ad015…

The file is read in your browser and reduced to checksums you compare against the values the publisher posted; any mismatch means corruption or tampering. CRC32 catches accidental transmission errors cheaply, while SHA-256 is the one to trust for integrity. The file never leaves your machine.

What is Checksum Calculator?

Upload a file and calculate its checksum using MD5, SHA-1, or SHA-256. Compare it against an expected value to verify the file has not been corrupted or altered during download or transfer.

How to use

  1. 1Upload the file you want to verify.
  2. 2Select the checksum algorithm.
  3. 3Paste the expected checksum to compare (optional).
  4. 4The tool highlights whether the values match.

Key features

  • MD5, SHA-1, and SHA-256 support
  • Drag-and-drop file upload
  • Side-by-side comparison with an expected checksum
  • Match/mismatch indicator
  • Processes files locally, nothing is uploaded to a server

Common use cases

  • Verifying software downloads

    Confirm that a downloaded ISO, installer, or archive matches the hash published by the developer.

  • Data transfer validation

    Ensure a file sent via email or cloud storage arrived intact by comparing checksums on both ends.

Frequently asked questions

Which algorithm should I use?

Use whichever algorithm the file publisher provides. SHA-256 is the most common choice for modern software verification.

How is this different from the hash generator?

The checksum calculator is focused on file verification with a comparison feature. The hash generator is broader, supporting text input and multiple simultaneous algorithms.

Private by design

Conversions run on your device in JavaScript. The values you enter are never sent over the network.