6 free browser-based tools to generate and verify file hashes, checksums and HMAC signatures. All calculations run locally in your browser.
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes for any file.
Compare two checksums to verify file integrity.
Calculate the CRC-32 checksum of any file.
Generate an MD5 hash for file verification purposes.
Hash any text string using MD5, SHA-1, SHA-256 or SHA-512.
Generate an HMAC signature using a secret key and hash algorithm.
A clear explanation of file hashes and how to use them for verification.
Step-by-step guide to verifying downloaded files with SHA-256.
Understand what local processing means and what it does not protect.
Common questions about checksums, file hashes and integrity verification.
A checksum is a short value calculated from a file's contents. If the file changes even slightly, the checksum changes too. This lets you confirm that a downloaded file arrived intact and has not been tampered with.
SHA-256 is the recommended choice for integrity verification. MD5 and SHA-1 are older and have known weaknesses for collision resistance, though they are still commonly used for basic corruption checks. Use SHA-256 or SHA-512 when security matters.
A matching checksum confirms the file matches the reference copy. It does not prove the original file was free of malware or that the reference itself was trustworthy. Always download checksums from the official source.
No. All hash calculations run locally in your browser using the Web Crypto API. Your file is read by the browser and processed on your device - it is not sent to NEXDOWNLOAD servers.
HMAC (Hash-based Message Authentication Code) combines a secret key with a hash function. It is used to verify both the integrity and authenticity of a message when two parties share a secret key. It is different from a plain hash, which has no secret.
CRC-32 is a fast checksum algorithm commonly used to detect accidental data corruption in file transfers and storage. It is not cryptographically secure and should not be used for security purposes - use SHA-256 for that.
Tool reference
Hash and checksum tools help reproduce a digest, compare exact values and detect data changes. A matching value confirms agreement with the reference, not that the reference source is trustworthy or that the file is malware-free.
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes for any file. Use it when you need checking data integrity with hashes, checksums or keyed message authentication values. Use the same algorithm as the published reference and compare every character. A matching checksum verifies equivalence to that reference; it does not by itself prove the file is malware-free.
Compare two checksums to verify file integrity. Use it when you need checking data integrity with hashes, checksums or keyed message authentication values. Copy the reference hash from the official publisher or another trusted channel. Compare the full value rather than only the first or last few characters.
Calculate the CRC-32 checksum of any file. Use it when you need checking data integrity with hashes, checksums or keyed message authentication values. Use the same algorithm as the published reference and compare every character. A matching checksum verifies equivalence to that reference; it does not by itself prove the file is malware-free.
Generate an MD5 hash for file verification purposes. Use it when you need checking data integrity with hashes, checksums or keyed message authentication values. Use the same algorithm as the published reference and compare every character. A matching checksum verifies equivalence to that reference; it does not by itself prove the file is malware-free.
Hash any text string using MD5, SHA-1, SHA-256 or SHA-512. Use it when you need checking data integrity with hashes, checksums or keyed message authentication values. Use the same algorithm as the published reference and compare every character. A matching checksum verifies equivalence to that reference; it does not by itself prove the file is malware-free.
Generate an HMAC signature using a secret key and hash algorithm. Use it when you need checking data integrity with hashes, checksums or keyed message authentication values. Verify the algorithm, secret key encoding and input bytes match on both sides. A different space, line ending or character encoding produces a different HMAC.
Complete category reference
Checksums and hashes are exact-data tools. The algorithm, complete digest and trusted reference all matter. A matching value can confirm byte agreement, but it does not automatically prove publisher identity or malware safety.
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes for any file.
Use it when you need checking data integrity with hashes, checksums or keyed message authentication values. A digest is calculated from the exact bytes of the selected file or text. The source is not intentionally modified. Small input changes should produce a different checksum or cryptographic hash.
Before you finish, Use the same algorithm as the published reference and compare every character. A matching checksum verifies equivalence to that reference; it does not by itself prove the file is malware-free.
Compare two checksums to verify file integrity.
Use it when you need checking data integrity with hashes, checksums or keyed message authentication values. The comparison normalizes the values you enter and checks whether they match. It does not establish that the reference checksum came from a trustworthy source.
Before you finish, Copy the reference hash from the official publisher or another trusted channel. Compare the full value rather than only the first or last few characters.
Calculate the CRC-32 checksum of any file.
Use it when you need checking data integrity with hashes, checksums or keyed message authentication values. A digest is calculated from the exact bytes of the selected file or text. The source is not intentionally modified. Small input changes should produce a different checksum or cryptographic hash.
Before you finish, Use the same algorithm as the published reference and compare every character. A matching checksum verifies equivalence to that reference; it does not by itself prove the file is malware-free.
Generate an MD5 hash for file verification purposes.
Use it when you need checking data integrity with hashes, checksums or keyed message authentication values. A digest is calculated from the exact bytes of the selected file or text. The source is not intentionally modified. Small input changes should produce a different checksum or cryptographic hash.
Before you finish, Use the same algorithm as the published reference and compare every character. A matching checksum verifies equivalence to that reference; it does not by itself prove the file is malware-free.
Hash any text string using MD5, SHA-1, SHA-256 or SHA-512.
Use it when you need checking data integrity with hashes, checksums or keyed message authentication values. A digest is calculated from the exact bytes of the selected file or text. The source is not intentionally modified. Small input changes should produce a different checksum or cryptographic hash.
Before you finish, Use the same algorithm as the published reference and compare every character. A matching checksum verifies equivalence to that reference; it does not by itself prove the file is malware-free.
Generate an HMAC signature using a secret key and hash algorithm.
Use it when you need checking data integrity with hashes, checksums or keyed message authentication values. HMAC combines a secret key with a hash function to produce an authentication code. The original text is not encrypted, and anyone who receives the HMAC cannot recover the input from the code alone.
Before you finish, Verify the algorithm, secret key encoding and input bytes match on both sides. A different space, line ending or character encoding produces a different HMAC.