Compute SHA-1/256/384/512, MD5 and CRC32 of any file, entirely in your browser.
Pick one or more files, choose the hash algorithms you need (multi-select with Ctrl/Cmd-click), then click Calculate. SHA family uses the browser's native SubtleCrypto; MD5 uses SparkMD5 with chunked incremental reads so large files won't crash the tab; CRC32 is computed over an in-memory buffer (very large files may take a moment). Nothing is uploaded — all hashing runs locally.