File Checksum Calculator
Drop in any file to compute its checksum across every common SHA-2 algorithm at once, useful for verifying that a downloaded file matches its published hash. The file is hashed directly on your device and never uploaded anywhere.
The checksum is computed inside your browser directly from the file; the file is never uploaded to any server.
Drag a file here or choose one
Any file type
What this tool does
Computes a checksum for a file on your device, so you can compare it against a published value and confirm the file arrived intact and unmodified.
When to use it
- You downloaded a file whose site publishes a checksum and want to match it.
- Confirming a file transferred over a network was not corrupted.
- Comparing two copies of a file to see whether they are byte-identical.
- Recording a checksum for a file before archiving it.
How to use it
- Put the file on the drop area or choose it.
- Wait for the computation to finish.
- Copy the value and compare it with the published one.
A practical example
Input
An installer you downloaded, alongside the SHA-256 published on its download page.
Output
A value computed from your copy: a match means the file is intact, a mismatch means it is corrupted or not the same file.
Limitations
- A match proves your file is the one the published value was computed from, provided that published value is itself trustworthy — if the site were compromised, both could be forged together.
- Large files take time, because the computation reads every byte.
- A mismatch tells you that something differs, not what.
Privacy and processing
The file is read and computed on your device and is never uploaded — which means you can verify a sensitive file without sending it to anyone.
Technical notes
- The computation runs over the file's entire binary content, so any change at all produces a completely different value.