// FREE IT TOOLS

Hash Generator

Generate MD5, SHA-1, and SHA-256 hashes from any text string instantly — all processing happens in your browser.

// ENTER TEXT

Nothing is sent to the server — all hashing happens in your browser.

examples:

Enter text above to generate hashes

What Is a Hash Function?

A hash function takes an input of any length and produces a fixed-size string of characters — the hash ordigest. The same input always produces the same output, but even a tiny change to the input produces a completely different hash.

Hashes are one-way functions: you cannot reverse a hash back to its original input. This makes them essential for verifying data integrity, storing passwords securely, and detecting duplicates without exposing the original content.

MD5, SHA-1, and SHA-256 Compared

Algorithm	Digest Length	Security	Common Uses
MD5	128 bits (32 hex chars)	Broken	File checksums, deduplication, non-security indexing
SHA-1	160 bits (40 hex chars)	Deprecated	Legacy systems, Git commit IDs, backward compatibility
SHA-256	256 bits (64 hex chars)	Secure	Passwords, digital signatures, TLS certificates, blockchain

When to Use Each Algorithm

Use MD5when you need a quick, lightweight checksum for non-security purposes — detecting duplicate files, verifying a download hasn't been corrupted, or indexing content where collision resistance is not a concern.

Use SHA-1 only for compatibility with existing systems that require it. SHA-1 has been cryptographically broken since 2017 — collision attacks are practical. Do not use SHA-1 for passwords, signatures, or any security-sensitive application.

Use SHA-256 for any security-related purpose — password hashing (with salt and key derivation), data integrity verification, digital signatures, and any scenario where collision resistance matters. SHA-256 is the current industry standard and is used in TLS certificates, blockchain networks, and most modern security protocols.

Frequently Asked Questions

Is this tool secure for passwords?: The tool itself is safe — hashing happens entirely in your browser and nothing is transmitted. However, MD5 and SHA-1 should never be used for password storage. For passwords, use a dedicated key derivation function like bcrypt, Argon2, or PBKDF2 with a random salt.
Can I reverse a hash to get the original text?: No. Hash functions are one-way by design. The only way to find the original input from a hash is by trying inputs until you find a match (a brute-force or rainbow table attack), which is computationally infeasible for strong hashes like SHA-256 with long inputs.
Why does changing one character produce a completely different hash?: This is called the avalanche effect — a core property of cryptographic hash functions. A small change in input causes every bit of the output to change with roughly 50% probability, making the two hashes appear unrelated.
What does "collision" mean in hashing?: A collision occurs when two different inputs produce the same hash. All hash functions have collisions because there are infinitely many possible inputs but only finitely many outputs. MD5 and SHA-1 have known practical collision attacks — meaning attackers can deliberately create two inputs with the same hash. SHA-256 has no known practical collisions.
Is my text sent to a server?: No. All hashing is performed in your browser using JavaScript. Your input text never leaves your device and is not stored or transmitted anywhere.

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What Is a Hash Function?

MD5, SHA-1, and SHA-256 Compared

Algorithm	Digest Length	Security	Common Uses
MD5	128 bits (32 hex chars)	Broken	File checksums, deduplication, non-security indexing
SHA-1	160 bits (40 hex chars)	Deprecated	Legacy systems, Git commit IDs, backward compatibility
SHA-256	256 bits (64 hex chars)	Secure	Passwords, digital signatures, TLS certificates, blockchain

When to Use Each Algorithm

Frequently Asked Questions

Is this tool secure for passwords?

The tool itself is safe — hashing happens entirely in your browser and nothing is transmitted. However, MD5 and SHA-1 should never be used for password storage. For passwords, use a dedicated key derivation function like bcrypt, Argon2, or PBKDF2 with a random salt.

Can I reverse a hash to get the original text?

No. Hash functions are one-way by design. The only way to find the original input from a hash is by trying inputs until you find a match (a brute-force or rainbow table attack), which is computationally infeasible for strong hashes like SHA-256 with long inputs.

Why does changing one character produce a completely different hash?

This is called the avalanche effect — a core property of cryptographic hash functions. A small change in input causes every bit of the output to change with roughly 50% probability, making the two hashes appear unrelated.

What does "collision" mean in hashing?

A collision occurs when two different inputs produce the same hash. All hash functions have collisions because there are infinitely many possible inputs but only finitely many outputs. MD5 and SHA-1 have known practical collision attacks — meaning attackers can deliberately create two inputs with the same hash. SHA-256 has no known practical collisions.

Is my text sent to a server?

No. All hashing is performed in your browser using JavaScript. Your input text never leaves your device and is not stored or transmitted anywhere.