HashCrack: a simple tool for when you need to crack a hash and don't want to set up Hashcat

If you’ve done any CTF challenges, you’ve hit this at some point.

You find an MD5 hash somewhere in the challenge. You know what it is. You need to reverse it to get the plaintext.

You have two options: set up Hashcat with wordlists, GPU modes, and config files, or paste it into CrackStation and hope for the best.

HashCrack is a third option. Browser-based, no setup, straightforward.

First, how hash cracking actually works

A hash is a one-way function. You can go from password to hash, but not from hash to password mathematically.

That direction is intentionally broken.

So cracking a hash means guessing. You take a list of known passwords, hash each one, and check whether any of them match your target hash.

If “password123” hashes to the same value you’re looking at, you found it.

This is called a dictionary attack. You’re not breaking the math, you’re just checking whether the plaintext was something predictable.

Input: 5f4dcc3b5aa765d61d8327deb882cf99

Check: hash("password") = 5f4dcc3b5aa765d61d8327deb882cf99 ✓

That’s literally it. MD5 of “password” is that hash. Always has been.

Which is why MD5 is terrible for storing passwords but fine for checksums and CTF flags.

What HashCrack does

You paste a hash, pick the algorithm (MD5, SHA1, SHA256, SHA512), and it runs through a built-in wordlist looking for a match.

If the plaintext is in the wordlist, it finds it. If not, it tells you.

It’s not Hashcat. It won’t crack bcrypt or run GPU-accelerated rainbow tables.

It’s for the specific use case of CTF challenges where the hash is MD5 or SHA1 and the plaintext is something a human chose.

In that context it works well. Most CTF hashes for beginner challenges are MD5 of something from rockyou.txt or similar wordlists.

HashCrack covers that.

Try HashCrack

When each algorithm shows up in CTFs

MD5: everywhere in beginner CTFs. Legacy, fast, completely broken for security but still used constantly.

Recognizable by being 32 hex characters.

SHA1: 40 hex characters. Slightly more common in older web challenge CTFs.

Also broken for collision resistance but still shows up.

SHA256: 64 hex characters. Harder to crack just from a wordlist unless the plaintext is really predictable.

Shows up in more intermediate challenges.

SHA512: 128 hex characters. Same story, stronger hash, but if the plaintext is weak the hash is still crackable.

The quick way to identify which algorithm you’re dealing with is the length:

• 32 chars → MD5
• 40 chars → SHA1
• 64 chars → SHA256
• 128 chars → SHA512

Limitations, be straight about this

HashCrack won’t help you if:

• The hash is bcrypt, scrypt, or Argon2 (these are designed to be slow to crack)
• The plaintext is a random string, not a real word or common password
• The password was salted before hashing
• You need GPU acceleration for large wordlists

For serious cracking work, Hashcat with a proper GPU and rockyou.txt is still the right tool.

HashCrack is for quick checks without setup.

The CTF workflow I use

1. Find the hash in the challenge
2. Identify the algorithm by length
3. Paste it into HashCrack for a quick check
4. If that fails, move to an online lookup like CrackStation
5. If that also fails, pull out Hashcat with rockyou.txt

Usually it gets resolved at step 3 or 4 for beginner challenges.

If you’re getting into CTFs and keep hitting hashes you can’t figure out, HashCrack is worth bookmarking just for the speed of not having to set anything up. Quick paste, quick check, move on.

HashCrack on darkmintis.dev