Hash any text or file
in milliseconds

A hash function takes any input (text, file, or arbitrary data) and produces a fixed-length output called a hash, digest, or fingerprint. Good hash functions have three key properties: (1) the same input always produces the same hash, (2) any change to the input produces a completely different hash (the avalanche effect), and (3) it is computationally infeasible to reverse a hash back to its input. Cryptographic hash functions like SHA-256 add a fourth property: collision resistance — it is infeasible to find two different inputs with the same hash.

For most use cases, SHA-256 is the best choice in 2026. It is widely supported, cryptographically secure, fast on modern hardware, and the default in virtually all current security protocols (TLS, code signing, cryptocurrencies). Use SHA-512 when you want a larger security margin or when working with 64-bit-optimized systems. Use MD5 or SHA-1 only for legacy compatibility — both are cryptographically broken. Use CRC-32 only for non-security error detection. For passwords, never use any plain hash — use Argon2id, bcrypt, or scrypt.

Yes, this hash generator is 100% free with no usage limits. There is no signup, no registration, no payment, no daily quota. Hash as many strings or files as you want. The tool is completely client-side — your inputs are processed in your browser, so there are no per-user server costs to limit. Files are limited only by your browser's available memory.

Your data is 100% safe — it never leaves your device. All hash calculation runs entirely in your browser using JavaScript and the Web Crypto API. There are no server uploads, no logging of inputs, and no tracking of what you hash. You can verify this yourself by opening browser DevTools, switching to the Network tab, and hashing some data — you will see zero outgoing requests carrying your input. This makes the tool safe for sensitive data, confidential documents, and proprietary files.

On this page, paste your text into the input box and the common hashes (MD5, SHA-1, SHA-256, SHA-512) appear instantly. To hash a file, click the File tab and drag your file onto the drop zone. Need a different algorithm or all 10 at once? Use the All Algorithms page. Each algorithm also has its own dedicated page with detailed explanation and use cases.

All four produce fixed-length hashes of any input, but with different output sizes and security levels. MD5 (128-bit, broken) and SHA-1 (160-bit, broken) are legacy algorithms with known collision attacks — fine for checksums, not for security. SHA-256 (256-bit) is the modern standard with no known practical attacks. SHA-512 (512-bit) provides a larger security margin and is faster on 64-bit CPUs. For new projects use SHA-256 or SHA-512; use MD5/SHA-1 only for legacy compatibility.

No — cryptographic hash functions are one-way by design. Given a hash, there is no efficient algorithm to recover the original input. However, common or short inputs (like 'password' or 'admin123') can be found via rainbow tables — precomputed databases of common inputs and their hashes. This is why password storage should always use salted, slow hash functions like Argon2id, never plain SHA-256.

Yes, the hashes generated by this tool are byte-identical to those produced by standard command-line tools (md5sum, sha256sum, sha512sum, certutil, openssl dgst) when applied to the same input bytes. The cryptographic hashes use your browser's built-in Web Crypto API, which implements the NIST FIPS standards. The CRC-32 uses the IEEE 802.3 polynomial standard. We have verified outputs against published test vectors for all 10 algorithms.

The terms are often used interchangeably, but technically: a checksum is a short value used to detect accidental errors (CRC-32, Adler-32, Internet Checksum), while a cryptographic hash is designed to detect both accidental and intentional changes (MD5, SHA family). All cryptographic hashes can serve as checksums, but not all checksums are cryptographic hashes. Use 'checksum' for error detection (CRC-32) and 'hash' for security applications (SHA-256).

Common reasons: (1) Verifying downloads — comparing a downloaded file's SHA-256 against the value published by the source to confirm the file isn't corrupted or tampered with. (2) Detecting duplicates — two files with the same hash are byte-identical. (3) Forensics and evidence — proving a file hasn't been modified since a known time. (4) Database deduplication — using hashes as content-addressable identifiers. (5) Software distribution — package managers verify integrity via hashes. (6) Build reproducibility — confirming that a build output matches an expected hash.