Free online file hash calculator and integrity verifier. Drag and drop any file to compute MD5, SHA-1, SHA-256, and SHA-512 hashes. Paste an expected hash to verify file integrity — algorithm auto-detected. Runs entirely in your browser.
Drag & drop a file here or click to select
Any file type — processed entirely in your browser
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Paste the expected hash to compare against the computed value. The algorithm is auto-detected from hash length.
File Hash Verifier is a free online tool that computes cryptographic hashes (MD5, SHA-1, SHA-256, SHA-512) for any file you drop into your browser. It also lets you paste an expected hash value to verify file integrity — confirming that the file you downloaded matches the hash published by the software author. The algorithm is auto-detected from the length of the expected hash. All hashing is performed entirely in your browser using the Web Crypto API — your files are never uploaded to any server, making it safe for sensitive documents, software installers, and proprietary files.
Use the File Hash Verifier when you download software installers, firmware updates, or ISO images and want to confirm the file was not corrupted or tampered with during transfer. It is essential for verifying PGP-signed releases, validating checksums published on download pages, and confirming that large file transfers completed without data corruption. The drag-and-drop interface makes it faster than using command-line tools like shasum or md5sum.
Security-conscious developers and system administrators use File Hash Verifier to verify downloaded software against published checksums, check ISO image integrity before creating bootable media, validate firmware files before flashing embedded devices, confirm that backup archives are not corrupted, compare file versions by hash to detect changes, and audit file integrity as part of security compliance workflows. The built-in verification feature with automatic algorithm detection makes the comparison process quick and reliable.
Essential terms and definitions related to File Hash Verifier.
A mathematical function that takes an arbitrary-length input and produces a fixed-length output (digest) with three key properties: deterministic (same input always gives the same output), pre-image resistant (cannot reverse the hash to find the input), and collision resistant (extremely difficult to find two different inputs with the same hash). Used for data integrity verification, digital signatures, and password storage.
A value derived from a data set used to detect errors or changes. In the context of file downloads, publishers compute a checksum (usually SHA-256) of the original file and publish it alongside the download. After downloading, you compute the checksum of your local file and compare — a match confirms the file was not corrupted or tampered with during transfer.
A member of the SHA-2 (Secure Hash Algorithm 2) family designed by the NSA. It produces a 256-bit (64-character hexadecimal) digest. SHA-256 is widely used in file integrity verification, digital certificates (TLS/SSL), blockchain (Bitcoin), and software distribution. It has no known practical attacks and is recommended by NIST for current use.
A browser-native JavaScript API that provides cryptographic operations including hashing (SHA-1, SHA-256, SHA-384, SHA-512), encryption (AES, RSA), digital signatures, and key generation. It runs in compiled native code (not JavaScript), making it significantly faster than JavaScript-based crypto libraries. All modern browsers support it. This tool uses Web Crypto for SHA hashing and a JavaScript implementation for MD5 (which Web Crypto does not support).
No. All hash computation happens entirely in your browser using the Web Crypto API. Your file is read locally using the JavaScript FileReader API and processed in memory. No data is ever transmitted to any server, making this tool safe for sensitive files, proprietary software, and confidential documents.
The tool can hash files of any size that your browser can load into memory. Most modern browsers handle files up to several hundred megabytes without issues. For very large files (1GB+), processing may take several seconds and will depend on your device's CPU speed and available memory.
Use the same algorithm that the file publisher provides. If you have a choice, SHA-256 is the current best practice for file integrity verification — it is fast, widely supported, and provides strong collision resistance. MD5 and SHA-1 are considered cryptographically broken for security purposes but are still commonly used for checksum verification where collision attacks are not a practical concern.
The tool detects the algorithm from the length of the expected hash you paste: 32 characters = MD5, 40 characters = SHA-1, 64 characters = SHA-256, 128 characters = SHA-512. This covers all standard hash lengths. If the hash length does not match any known algorithm, the tool will display a warning.
A hash mismatch means the file you have is different from the file the publisher hashed. Common causes: the file was corrupted during download (retry the download), the file was modified or tampered with (do not trust it), you are comparing against the wrong file or version, or the hash was computed using a different algorithm than you selected. Always verify you are using the correct expected hash from a trusted source.
Common errors developers encounter and how to resolve them.
Hash does not match but the file downloaded correctly First verify that you are comparing against the correct hash for the exact file version and platform you downloaded. Some publishers provide different hashes for different OS builds (Windows, macOS, Linux) or architectures (x64, ARM). Also ensure the expected hash is for the same algorithm — a SHA-256 hash will never match a SHA-512 hash of the same file. Finally, check that the download was not intercepted by an antivirus scanner or corporate proxy that may have modified the file.
Hashing large files causes browser to freeze When hashing files larger than 500MB, the browser's main thread may become unresponsive during computation. The Web Crypto API (used for SHA algorithms) runs natively and is generally fast, but the MD5 implementation runs in JavaScript and is slower for large files. For very large files, consider using the command-line tool shasum on macOS/Linux or Get-FileHash in PowerShell on Windows for better performance.
Different tools give different MD5 hashes for the same file MD5 hash differences usually indicate that the tools are processing the file differently. Common causes: one tool is hashing the file content in text mode (converting line endings) while another uses binary mode, or the file was modified between hash computations. Always use binary mode for file hashing. This tool reads files as raw ArrayBuffer (binary), which produces correct results.