RFID Card Reader Test
Test a USB RFID reader and check any RFID card number online. Tap a card to see its number in decimal, hex and facility code format. Nothing is uploaded.
Live test
Plug in your USB RFID reader and hold a card or key fob on it. The page starts reading on its own, no click needed.
- Card number
- Hex
- Short format
- Read by
Many cards have the short format printed on them. If it matches, the reader is reading the card correctly.
Cards read (0)
This list stays in your browser for this visit only and is cleared when you close or refresh the page.
- No cards yet.
How it works
- Most USB RFID readers act like a keyboard, so they plug in and work with no driver.
- Just hold a card or key fob on the reader. The page is ready the moment it loads, with nothing to click.
- The reader sends the card number as if it were typed, and this page shows it at once with a beep.
- If a number appears and it matches what is printed on the card, the reader and the card are both working.
The three numbers explained
- Card number: the full number the reader sent, shown in decimal.
- Hex: the same number in hexadecimal, which some access systems use.
- Short format: the facility code and card number, such as 001,23456, printed on many 125 kHz proximity cards.
Is anything uploaded or saved?
No. Everything runs inside your browser on your own device. The reader types the number in, this page shows it, and nothing is sent to a server. The list of reads is kept in memory only for this visit and is gone the moment you refresh or close the page.
Do I need to click anything first?
No. The page listens for the reader as soon as it loads, so you can tap a card straight away. It only needs the browser tab to be active. If you have clicked into another tab or app, click back onto this page once and it reads again. The first read may be silent until you have interacted with the page once, since browsers only allow the beep after an interaction.
Which readers and cards does it work with?
Any USB reader that behaves like a keyboard, which is most of them. Both 125 kHz proximity cards and 13.56 kHz cards work as long as the reader emulates a keyboard and outputs a number. If your reader needs its own software, this page cannot read it.
Why does a number appear when I tap a card?
The reader converts the card's stored ID into a number and sends it as keystrokes, ending with Enter. This page catches those keystrokes and displays the number, exactly as your access system would receive it.
The number does not match what is printed on the card.
Readers can output the same card in different ways: full decimal, hex, or the short facility and card format. Check the short format shown here against the card, since that is what is usually printed. A different reader model may output a different form of the same ID.
Nothing happens when I tap a card.
Make sure the reader is plugged in and that this browser tab is active, clicking anywhere on the page once if you are not sure. Check that the reader emulates a keyboard and that the card is the right frequency for the reader. A quick separate test: open any text box, such as a search bar, and tap a card; if nothing types there, the reader or card is the problem, not this page.
Does it work on a phone?
It works best on a desktop or laptop with a USB reader. Some Bluetooth readers that pair as a keyboard also work on a phone or tablet.
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