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<!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <title>Using checked attribute to Check/Uncheck checkbox</title> </head> <body> <div> <label for="checkbox"> <input type="checkbox" name="money" id="checkbox"> Option </label> </div> <button onclick="check()">Check</button> <button onclick="uncheck()">Uncheck</button> <script> function check(){ document.getElementById("checkbox").checked = true; } function uncheck(){ document.getElementById("checkbox").checked = false; } </script> </body> </html>