MD5 Hash Generator

Encrypt any text or file to MD5, or try to reverse a known MD5 hash with the built-in dictionary. 100% client-side.

About MD5

MD5 (Message-Digest Algorithm 5) is a widely used cryptographic hash function that produces a 128-bit (32-character hexadecimal) hash value. Originally designed in 1991 by Ron Rivest, MD5 is fast, deterministic, and produces the same output for the same input — making it ideal for file integrity checks, checksums, and fingerprinting. It is not collision-resistant and should not be used for password storage, digital signatures, or any security-critical purpose. Use SHA-256 or SHA-512 instead when you need a secure hash.

How to Use

Encrypt: switch to the Text Input or File Input tab, type / paste text or drop a file, then click Generate MD5.
Reverse lookup: switch to the Decrypt (Dictionary) tab, paste the target MD5 hash, and start the dictionary attack. The tool hashes each candidate and reports the match.
Copy: click the copy icon next to the hash to copy it to your clipboard.

FAQ

Can MD5 be decrypted?

MD5 is a one-way function and cannot be mathematically reversed. However, you can recover the original plaintext by hashing candidate strings (dictionary attack) and comparing to the target. The built-in top-100 common-password dictionary can crack weak passwords in milliseconds. For larger wordlists, paste your own list into the Custom Wordlist field.

Is MD5 still used?

Yes, but only for non-security purposes: file integrity checks, deduplication, cache keys, and legacy system compatibility. For password storage or any cryptographic use, prefer SHA-256 or stronger.

Is my data sent to a server?

No. MD5 computation and dictionary attack run entirely in your browser using the Web Crypto / JS APIs. Your text, files, hashes, and wordlist never leave your device.

What is a 32-character MD5 hash?

MD5 produces a 128-bit digest, which is typically rendered as 32 hexadecimal characters (each hex digit = 4 bits). Examples: the MD5 of "hello" is 5d41402abc4b2a76b9719d911017c592.

MD5 vs SHA-1 vs SHA-256 — which should I use?

Use MD5 only for non-security checksums. Use SHA-1 for Git commit IDs and legacy compatibility (also weakened). Use SHA-256 for modern security (SSL/TLS, code signing, password hashing with salt).

AI AgentStructured Prompt

Use MD5 Hash Calculator in AI

Copy the schema, SOP, and reference script directly into your agent workflow.

1. Function Schema

Import directly into Dify, Coze, Cursor, or any tool-calling agent runtime.

Function Schema

{
  "name": "md5_hash",
  "description": "Compute the MD5 hash of a UTF-8 string and return the 32-character lowercase hex digest. MD5 is one-way; do not use for password storage or security purposes.",
  "parameters": {
    "type": "object",
    "properties": {
      "input_string": {
        "type": "string",
        "description": "The raw text to hash. Will be encoded as UTF-8 before hashing."
      }
    },
    "required": ["input_string"]
  }
}

2. System Prompt / SOP

Paste this into your system prompt to keep the generated tool implementation aligned with the contract.

System Prompt SOP

# Task Constraints: MD5 Module

MD5 is a one-way cryptographic hash that produces a 128-bit (32 hex character) digest. It is FAST but cryptographically BROKEN (collision attacks exist since 2004). Only use for non-security checksums, file integrity, or cache keys.

## Core Prohibitions
- NEVER recommend MD5 for password storage, digital signatures, TLS, or any security-critical purpose.
- NEVER hash binary input by stringifying it byte-by-byte without explicit UTF-8 encoding.
- NEVER expose the input back from the hash — it cannot be reversed.

## Standard Implementation
1. Encode the input as UTF-8 bytes (TextEncoder / Buffer).
2. Compute MD5 in 64-byte block chunks per RFC 1321.
3. Render the four 32-bit state words as 32 lowercase hex characters.
4. Return `{ success, result, error }` — never throw raw exceptions.

3. Core Script

Drop into a Dify / Coze code-execution node. Replace `md5Bytes` with your runtime's MD5 (Node `crypto.createHash('md5')`, Python `hashlib.md5`, etc.).

Core Script

async function main(args) {
  const { input_string } = args;
  if (typeof input_string !== "string") {
    return { success: false, result: "", error: "input_string must be a string" };
  }
  try {
    const bytes = new TextEncoder().encode(input_string);
    // Use a vetted MD5 implementation. This snippet is a contract — the
    // production function should be substituted by your runtime.
    const result = await md5Bytes(bytes); // 32-char hex
    return { success: true, result, error: "" };
  } catch (error) {
    return {
      success: false,
      result: "",
      error: "MD5 failed: " + (error instanceof Error ? error.message : String(error)),
    };
  }
}

Full documentation at /hash-calculator/md5/ai

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