RFID Card and Reader Tester
Test any USB RFID reader and your cards or key fobs in the browser. Tap a card and see its number in decimal, hex and the short facility and card format, so you can confirm the reader and card are working. Nothing is uploaded.
Live test
Plug in your USB RFID reader, click the box below so it is ready, then hold a card or key fob on the reader.
- 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.
- Click the box above so it is ready, then hold a card or key fob on the reader.
- 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.
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.
Check that the reader is plugged in, that you have clicked the box so it is ready, that the reader emulates a keyboard, and that the card is the right frequency for the reader. A quick way to test the reader itself is to open any text box and tap a card: if nothing types, 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.
Other free tools
Image to PDF Converter
Turn JPG, PNG or WEBP images into a single PDF.
Open toolImage Size Reducer
Compress images to a target size without a visible drop in quality.
Open toolQR Code Generator
Create a QR code for a link, phone number, email or UPI ID.
Open toolFree Invoice Generator
Make a GST invoice with CGST, SGST or IGST and download a PDF.
Open toolSlideshow For Mac
Play a whole folder of photos as a full screen slideshow.
Open tool