File SHA-1
Calculate a legacy SHA-1 checksum with a warning.
Add files or an archive
Drop files here. They will not be uploaded.
Result
How does File SHA-1 work?
Choose a file or a set of files. The app reads them directly in the browser, applies safety limits and performs the selected operation locally. The source file remains unchanged.
Security and limitations
Archives are checked for unsafe paths, extreme compression ratios and excessive entry counts. Archiwum does not execute extracted files and is not an antivirus scanner.
Privacy
File names and contents are not sent to our own server. Heavier formats use a local WebAssembly module that consumes the user device resources rather than DreamHost resources.
FAQ
Is the file uploaded?
No. The file is read by your browser on your device.
Can I cancel the operation?
Yes. The Cancel button stops the current task and releases resources.
Does the result modify the source file?
No. You download a new file or report.
Related tools
File SHA-256
Calculate SHA-256 in chunks without uploading the file.
#️⃣File SHA-384
Calculate SHA-384 locally.
#️⃣File SHA-512
Calculate SHA-512 locally.
#️⃣File MD5
Calculate MD5 only as a compatibility checksum.
#️⃣File CRC32
Calculate CRC32 for archive compatibility.
#️⃣File checksum
Choose an algorithm and copy the result.