PrismKit加密與資安VAT 號碼驗證器VAT 號碼驗證器在瀏覽器中執行本機複製連結Markdown離線檢查歐盟與英國增值稅（VAT）號碼的格式與檢查碼。ISBN 驗證器Verify the check digit of an ISBN-10 or ISBN-13 and convert between the two forms.凱撒密碼Shift letters with a Caesar, ROT13 or ROT47 cipher, or crack one by ranking all 25 shifts against English letter frequencies.