Hash Generator MD5/SHA
Calculate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text instantly.
What it's for
Cryptographic hashes in milliseconds
Multiple algorithms
MD5, SHA-1, SHA-256, and SHA-512 available in one place for any use case.
100% private
The hash is computed in your browser using the Web Crypto API. Your text never leaves your device.
Web Crypto API
Uses the browser's native implementation, the same one that powers HTTPS connections and JWTs.
Instant
The hash appears in milliseconds, even for long text. No form submission required.
How it works
Three steps, no hassle
Enter your text
Type or paste the text you want to hash. It can be a password, message, configuration string, or any text.
Choose the algorithm
Select MD5, SHA-1, SHA-256, or SHA-512 based on your use case. SHA-256 is the recommended choice for new projects.
Copy the hash
The hexadecimal hash appears instantly. Copy it with one click for integrity verification, secure storage, or comparison.
FAQ
Got questions?
MD5 produces a 128-bit hash (32 hex characters), SHA-256 produces a 256-bit hash (64 hex characters). The key difference is not size but security: MD5 has known collisions (two different inputs producing the same hash), making it insecure for digital signatures and certificates. SHA-256, part of the SHA-2 family, has no known collisions and is the NIST-recommended standard for security applications.
No. They are fundamentally different operations. Encryption is reversible: with the key, you can decrypt the original message. Hashing is a one-way function: given a hash, it is computationally impossible to recover the original input. Hashing does not protect data confidentiality — it protects data integrity: it lets you verify that data has not been modified without revealing the original data.
MD5 is insecure for cryptographic applications because practical collisions have been found: in 2004, researchers showed they could create two different files with the same MD5 hash within hours. This invalidates its use in digital signatures and SSL certificates. However, MD5 remains valid for non-cryptographic checksums (verifying integrity of downloaded files) where intentional collision attacks are not a threat.
SHA-512 produces a 512-bit hash (128 hex characters) and is part of the SHA-2 family. It is used in applications requiring the highest level of security: high-value digital signatures, cryptographic key derivation, authentication protocols for critical systems, and long-term archival. On 64-bit architectures, SHA-512 can actually be faster than SHA-256 because it better leverages the processor's 64-bit operations.
No, by mathematical design. Hash functions are one-way: they produce a fixed-length output from an arbitrary-length input and this transformation is not reversible. What is possible are dictionary attacks or rainbow table attacks: precomputing hashes of common passwords and looking for matches. This is why passwords should never be stored as plain hashes, but with slow hash functions like bcrypt or Argon2 with a salt.
Cryptographic hash functions: MD5, SHA-1, SHA-256, and SHA-512 explained
A cryptographic hash function is a one-way mathematical function that transforms an input of arbitrary length into a fixed-length output called a digest or hash. The essential properties of a secure hash function are: determinism (the same input always produces the same hash), the avalanche effect (changing a single input bit changes roughly 50% of the hash bits), preimage resistance (given a hash, the input cannot be recovered), and collision resistance (no two distinct inputs can be found with the same hash).
The SHA (Secure Hash Algorithm) family was developed by the NSA and standardized by NIST. SHA-1 (1995, 160 bits) was deprecated in 2017 when Google demonstrated the first practical collision with the SHAttered attack. SHA-2 (2001) includes SHA-224, SHA-256, SHA-384, and SHA-512, and remains secure for all current applications. SHA-3 (2015) uses a completely different architecture (sponge construction) as a design alternative to SHA-2, although SHA-2 remains the most widely adopted standard.
Convertir.ai calculates hashes using the browser's SubtleCrypto API (window.crypto.subtle.digest()), the same implementation that secures HTTPS connections and validates JWT tokens. This API is available in all modern browsers with no external dependencies. Running entirely on the client side, the text you enter is never transmitted over the network, making it appropriate for hashing sensitive data such as password fragments or private configuration strings.