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Password Strength Checker
Estimates password entropy and crack time, and identifies the specific weaknesses in what you…
Qatar IBAN Validator
Validates a Qatari IBAN: the mod-97 checksum, the 29-character length and the structure, with the bank code identified.
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In short
A Qatari IBAN is exactly 29 characters: QA, two check digits, then 4 letters, then 21 letters or digits — so the 4 characters after the check digits are the bank code — DOHB in the example — and the remaining 21 are the account number, 00001234567890ABCDEFG. Qatar uses four letters of bank code and twenty-one characters of account, which may be letters or digits. The checksum is ISO 7064 MOD-97-10: move the first four characters to the end, turn each letter into its position in the alphabet plus nine, and read the result as one long number, which must leave remainder 1 when divided by 97. That catches every single-character mistake and almost every swap of two neighbouring characters, which is what it was designed for and why an IBAN is worth checking before you pay rather than after. What it cannot do is tell you the account exists, is open, or belongs to the person you think — a random string of the right shape passes about once in 97 tries, and no amount of arithmetic reaches into a bank. This page runs entirely in your browser, so the number you type is not sent anywhere.
How to use the Qatar IBAN Validator
- Paste the Qatari IBAN — spaces and dashes are fine.
- Read the three checks: mod-97, length and structure.
- If it fails, the page says which check failed and what that usually means.
About the Qatar IBAN Validator
Checks a Qatari IBAN three ways — checksum, length and structure — and says which of the three failed when one does, because they mean different things.
What people use it for
- Checking a Qatari IBAN before sending money to it.
- Finding the bank code inside an IBAN you have been given.
- Confirming a Qatari number was typed or pasted correctly.
Details
| Length | 29 characters, always |
|---|---|
| Structure | 4!a21!c after the check digits |
| In words | QA, 2 check digits, then 4 letters, then 21 letters or digits |
| Bank code | 4 characters — DOHB in the example |
| Example | QA58 DOHB 0000 1234 5678 90AB CDEF G |
| Check digits | Always between 02 and 98. 00, 01 and 99 cannot occur |
| Privacy | The arithmetic runs in your browser. Nothing you type is sent anywhere |
The maths behind it
This tool uses ISO 7064 MOD-97-10 — move the first four characters to the end, replace each letter with its position plus nine, and a valid IBAN leaves remainder 1 on division by 97. On top of that, Qatari IBANs are exactly 29 characters and follow 4!a21!c. Every intermediate value is shown on screen, so the result can be checked by hand.
Three checks, reported separately on purpose. A length error means a character is missing or extra, a structure error means a letter sits where a digit belongs, and a checksum failure with both of those right means a genuine typo inside the number — most often two neighbouring characters swapped.
Where this tool stops
It checks arithmetic and shape. It cannot tell you the account exists or who it belongs to, it does not look the bank up, and it does not verify any national check digits Qatar may use inside its own account number — those are separate rules, computed differently, and passing mod-97 says nothing about them.
Frequently asked questions
How many characters is a Qatari IBAN?
Exactly 29, with no exceptions. After the two check digits the structure is 4!a21!c — 4 letters, then 21 letters or digits. A number of any other length is not a Qatari IBAN, whatever else about it looks right.
Can a Qatari IBAN contain letters?
Yes, in both the bank code and the account. The structure is 4!a21!c, so a digits-only validator will reject valid numbers.
Where is the bank code in a Qatari IBAN?
The 4 characters after the check digits are the bank code — DOHB in the example — and the remaining 21 are the account number, 00001234567890ABCDEFG.
Does a valid checksum mean the account exists?
No, and this is the thing worth taking away. Mod-97 proves the number is internally consistent — that it was probably typed correctly. It says nothing about whether the account is open, or whose it is. A random string of the right length passes about once in every 97 attempts. Only the bank can confirm the rest.
Is it safe to paste an IBAN here?
The checking happens in your browser and the number is never sent to a server — there is no request to make one. An IBAN is not a secret the way a card number is, since it is printed on every invoice you send, but it is still yours, and it does not leave your machine here.
Does the Qatar IBAN Validator cost anything?
There is no cost and no cap. The Qatar IBAN Validator is not a demo of a paid product, so nothing is held back or watermarked.
Does anything I enter leave my computer?
No. The Qatar IBAN Validator runs entirely in your browser using JavaScript. Because the work happens locally, the page also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
What formula does the Qatar IBAN Validator use?
It uses ISO 7064 MOD-97-10 — move the first four characters to the end, replace each letter with its position plus nine, and a valid IBAN leaves remainder 1 on division by 97. On top of that, Qatari IBANs are exactly 29 characters and follow 4!a21!c. The full working is printed under the result, so you can follow every step rather than trusting a black box.
What is the Qatar IBAN Validator used for?
Typical uses: checking a Qatari IBAN before sending money to it. Finding the bank code inside an IBAN you have been given. Confirming a Qatari number was typed or pasted correctly. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Where does the Qatar IBAN Validator stop being reliable?
It checks arithmetic and shape. It cannot tell you the account exists or who it belongs to, it does not look the bank up, and it does not verify any national check digits Qatar may use inside its own account number — those are separate rules, computed differently, and passing mod-97 says nothing about them. Knowing where a tool stops being trustworthy matters more than the cases where it works.
What are the key numbers for the Qatar IBAN Validator?
Length is 29 characters, always. Structure is 4!a21!c after the check digits. In words is QA, 2 check digits, then 4 letters, then 21 letters or digits. These are printed on the page itself, so you do not have to take them on trust.
Is there an app version?
Yes. The page is responsive and the page works in Chrome, Safari, Firefox, Edge and Samsung Internet on both Android and iOS. There is no app to install and nothing to sign into.
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