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Free Hash Generator - MD5, SHA-1, SHA-256 & SHA-512

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text instantly.

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SHA-256 and SHA-512 use the browser's native crypto.subtle API. All processing is local - nothing is sent to a server.

About this tool

A cryptographic hash function takes an input of any size and produces a fixed-size output called a hash or digest. The same input always produces the same hash, but even a tiny change in the input produces a completely different hash. This makes hashes useful for verifying data integrity, storing passwords securely, and creating digital signatures. This tool supports four algorithms: MD5 (128-bit, 32 hex chars), SHA-1 (160-bit, 40 hex chars), SHA-256 (256-bit, 64 hex chars), and SHA-512 (512-bit, 128 hex chars). SHA-256 and SHA-512 are computed using the browser's native SubtleCrypto API, making them cryptographically secure. MD5 and SHA-1 are included for legacy compatibility but should not be used for new security-sensitive applications. All hashing happens entirely in your browser. Your text is never sent to any server.

How to use

Step 1: Type or paste the text you want to hash in the input field.
Step 2: Click Generate Hash to compute all four hash values simultaneously.
Step 3: Toggle Uppercase to switch the output between lowercase and uppercase hex.
Step 4: Click Copy next to any hash to copy it to your clipboard.
Step 5: Note the security warnings on MD5 and SHA-1 - prefer SHA-256 for any security-related use.

Frequently Asked Questions

A hash function takes any input and produces a fixed-size string of characters (the hash). It is a one-way function - you cannot reverse a hash to get the original input. The same input always produces the same hash.

MD5 is cryptographically broken and should not be used for security purposes. Collisions (two different inputs producing the same hash) have been demonstrated. It is still useful for non-security checksums like verifying file downloads.

For security applications (password hashing, digital signatures, certificates), use SHA-256 or SHA-512. For non-critical checksums where speed matters, MD5 or SHA-1 may be acceptable. Never use MD5 or SHA-1 for passwords - use bcrypt or Argon2 instead.

This tool hashes text input. To hash binary files, you would need a tool that accepts file upload and reads the raw binary content. File hashing is commonly done via command-line tools like sha256sum on Linux/Mac.

A checksum is a hash used to verify data integrity. When you download software, the developer publishes the SHA-256 checksum of the file. You can hash the downloaded file and compare it to verify it was not corrupted or tampered with.

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