MD5 Reverse Lookup
Check an MD5 or SHA-1 hash against a built-in list of common passwords and words, plus an optional short brute force. MD5 is one-way, not decryptable. Runs locally.
MD5 and SHA-1 are one-way hashes: there is no key and no way to reverse them. A so-called "MD5 decrypter" simply hashes a list of likely strings and checks whether any match — a reverse lookup. This tool does exactly that against a small built-in list — about 2,300 candidate strings made from common passwords and words — with an optional brute force of short strings, all in your browser. It has no large online database behind it.
How to use this tool
- Paste one or more hashes, one per line.
- Choose MD5 or SHA-1.
- Optionally turn on the brute force: every string of digits up to 7 long, lowercase letters up to 5, or lowercase letters and digits up to 4.
- Read the matched text, or "(not found)" when it is not one of the strings tried.
Formula
For each candidate string the tool computes its hash and compares it to your input. A match means the candidate was the original; no match means it was not in the list, not that the hash was "decrypted".
Example
The hash 5f4dcc3b5aa765d61d8327deb882cf99 is found to be "password", because that very common word is in the built-in list and hashes to exactly that value.
Frequently asked questions
Can MD5 really be decrypted?
No. MD5 has no inverse. Finding the text behind a hash is only possible by guessing candidates and hashing them — which works only for common or short inputs. A long, random value cannot be recovered.
Why does it only find common strings?
It only tries about 2,300 common passwords and words and, if you ask, every very short string. Online "decrypt" sites look hashes up in tables of billions of leaked passwords; this tool does not have such a table, so anything unusual or longer is reported as "(not found)".
Should I rely on MD5 for anything secret?
No. The fact that common values are instantly recoverable is exactly why MD5 and SHA-1 must never be used to store passwords. Use bcrypt, scrypt or Argon2 with a salt.
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Last updated:
Page address with these inputs: https://kakao.mobile/tools/md5-decrypt-tool/
Cite or embed this tool
kakaoCalc. (2026, November 8). MD5 Reverse Lookup. https://kakao.mobile/tools/md5-decrypt-tool/
“MD5 Reverse Lookup.” kakaoCalc, 8 Nov. 2026, kakao.mobile/tools/md5-decrypt-tool/.
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