Hash Calculator
Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes for any text or file. 100% private — nothing leaves your browser.
Hash output
About Hash Calculator
Cryptographic hash functions transform any input — a string of text, a document, a binary file — into a fixed-length fingerprint called a hash or digest. This fingerprint changes completely when even a single character of the input is altered, making hashes essential for verifying data integrity, comparing files, and understanding how modern security systems work.
Our Hash Calculator supports the four most widely used hash algorithms: MD5, SHA-1, SHA-256, and SHA-512. It generates all four hashes simultaneously from any text you type or any file you upload, running entirely in your browser using the Web Crypto API. Your data never leaves your device — no text, no files, no potentially sensitive content is transmitted anywhere.
Understanding which algorithm to use matters in practice. SHA-256 is the modern standard — it is used by Bitcoin, TLS certificates, and most security-conscious applications because no practical collision attacks against it are known. SHA-512 produces a larger digest and is marginally harder to brute-force. MD5 and SHA-1 are cryptographically broken for security purposes but remain widely used for file integrity checksums where collision resistance is not critical.
How to Use Hash Calculator
- 1Type or paste any text into the input field to generate hashes from a text string.
- 2Alternatively, click "Upload File" to generate hashes from any file on your device.
- 3All four hash values (MD5, SHA-1, SHA-256, SHA-512) appear simultaneously in the output.
- 4Click the copy icon next to any hash to copy it to your clipboard.
- 5To verify a file, compare the generated hash against the checksum published by the file source.
Use Cases
- →Verify the integrity of a downloaded file by comparing its SHA-256 checksum against the official value
- →Generate a unique fingerprint for a string to use as a cache key or deduplication identifier
- →Compare two files to confirm they are byte-for-byte identical without opening them
- →Learn how different hashing algorithms produce completely different outputs from the same input
- →Generate content hashes for cache-busting in web asset pipelines
- →Create a quick text fingerprint when you need a stable identifier from a variable-length string
Tips
- ✓SHA-256 is the recommended algorithm for any security-sensitive use case in modern applications
- ✓MD5 is fast and widely used for file checksums, but is NOT secure for passwords or signatures
- ✓Even a single space difference produces an entirely different hash — this is the avalanche effect
- ✓SHA-512 is slightly more secure than SHA-256 but produces twice the output length (128 hex chars)
- ✓Never use MD5 or SHA-1 for password hashing — use bcrypt, Argon2, or scrypt instead
- ✓File hashing works with any file type and size — the hash always has the same fixed length
Frequently Asked Questions
A hash function takes any input (text, file, data) and produces a fixed-length string of characters. The same input always produces the same hash, but even a tiny change in the input produces a completely different hash.
They differ in output length and security strength. MD5 (128-bit) is considered broken for security use. SHA-1 (160-bit) is also deprecated. SHA-256 (256-bit) and SHA-512 (512-bit) are current standards.
No. MD5 and SHA-1 have been broken for password storage. For passwords, use a dedicated algorithm like bcrypt, scrypt, or Argon2.
The File Hash tab reads your entire file directly in the browser using the File API, converts it to a byte array, and runs each hash algorithm over the raw bytes. The file never leaves your device.
SHA-256 is the most widely used hash algorithm today. It is used by Bitcoin, TLS/HTTPS certificates, code signing, software integrity verification, JWT tokens, and HMAC authentication.
Hash functions are deterministic — the same input always maps to the same output. This lets you verify that data has not been modified by comparing hashes.