Check if a known hash matches the text you entered above.
How it works
01
Type or paste text
Enter any text — a password, a message, a file content. All 4 hash types update instantly.
02
Choose the algorithm
MD5 for quick checksums, SHA-256 or SHA-512 for security-sensitive applications.
03
Copy your hash
Copy any hash with one click. Choose lowercase or uppercase output format.
04
Verify checksums
Paste a known hash to verify it matches your input. Great for file integrity checks.
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100% private. All hashing uses the browser's native Web Crypto API. Your text is never sent to any server — not even us can see it.
Frequently asked questions
A hash is a fixed-length string of characters produced by running data (text, files, passwords) through a mathematical algorithm called a hash function. The same input always produces the same output, but even a tiny change in the input completely changes the hash. Hashes are used to verify data integrity, store passwords securely, detect file tampering, generate unique identifiers, and create digital signatures.
MD5 produces a 128-bit (32-character) hash. It is fast but cryptographically broken — do not use it for security purposes. SHA-1 produces a 160-bit (40-character) hash and is also considered weak for security use. SHA-256 (part of SHA-2) produces a 256-bit (64-character) hash and is the current industry standard for most security applications. SHA-512 produces a 512-bit (128-character) hash — even stronger, but slower. For security-sensitive tasks, always use SHA-256 or SHA-512.
No. Hash functions are designed to be one-way — it is computationally infeasible to reverse a hash back to its original input. This is what makes them useful for storing passwords: even if an attacker obtains the hashed password, they cannot directly recover the original. However, weak or common passwords can still be cracked using rainbow tables (precomputed hash databases), which is why salting passwords is important in real applications.
When you download a file, the provider often publishes its SHA-256 hash. After downloading, you generate the hash of your downloaded file and compare it to the published value. If they match exactly, the file is intact and unmodified. If they differ, the file may have been corrupted or tampered with. This is a standard practice in software distribution and security auditing.
No. All hashing is performed locally in your browser using the Web Crypto API, which is a native, high-performance cryptographic library built into modern browsers. Your input text never leaves your device and is never transmitted to any server. This makes the tool safe to use with sensitive data such as passwords or private keys.
No — and this is important. MD5 (and SHA-1) are not suitable for storing passwords because they are too fast, making brute-force and rainbow table attacks practical. For password storage, use dedicated password hashing algorithms like bcrypt, Argon2, or PBKDF2, which are designed to be slow and include salting. The hash generator here is intended for data integrity checking and general-purpose use, not password storage in production applications.
This is called determinism — a core property of hash functions. Every time you run the same input through the same algorithm, you get the exact same output. This predictability is what makes hashes useful for verification: if two hashes of the same data match, the data is identical. If you change even one character in the input, the entire hash output changes completely (this is called the avalanche effect).
A hash collision occurs when two different inputs produce the same hash output. Because hash functions map infinite possible inputs to a fixed-length output, collisions are theoretically possible. MD5 and SHA-1 have known collision vulnerabilities, which is why they are no longer recommended for security use. SHA-256 and SHA-512 have no known practical collisions and are considered collision-resistant for current computing capabilities.