Calculate and verify file checksums online for free. Supports MD5, SHA-1, SHA-256, SHA-512 and CRC32. Runs entirely in your browser.
Drag and drop some files here, or click to select files.
SHA-256
How to calculate file checksums?
Drag & drop one or more files or click the input area to select files.
Choose the hash algorithm (MD5, SHA-1, SHA-256, SHA-512, CRC32).
The checksum is computed instantly in your browser — no files are uploaded to any server.
What is a file checksum?
A checksum is a fixed-size string computed from a file's contents using a hash algorithm. Even a tiny change in the file produces a completely different checksum, making it useful for verifying file integrity.
When should I use checksums?
To verify that a downloaded file has not been corrupted or tampered with.
To confirm two copies of a file are identical without comparing them byte-by-byte.
Software distributors publish checksums so users can verify authentic downloads.
Which algorithm should I choose?
SHA-256 is the recommended default — it is fast and widely used for integrity verification.
MD5 and CRC32 are faster but not cryptographically secure; use them only for simple error detection.
SHA-512 offers a longer hash for extra assurance. SHA-1 is provided for compatibility with older systems.
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