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HTML

              
                <!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Name Initial Avatar</title>
    <link rel="stylesheet" href="./style.css" />
  </head>
  <body>
    <div class="inputs">
      <form action="">
        <label for="firstname">Firstname:</label>
        <input type="text" id="firstname" />
        <label for="lastname">Lastname:</label>
        <input type="text" id="lastname" />
        <button type="submit" id="generateAvatar">Generate Image</button>
      </form>
    </div>
    <div class="outputs">
      <img id="img" />
    </div>
    <script src="./app.js"></script>
  </body>
</html>
              
            
!

CSS

              
                * {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, Helvetica, sans-serif;
}
body {
  display: flex;
  height: 100vh;
  width: 100%;
  align-items: center;
  justify-content: center;
}

input[type="text"] {
  padding: 0.5rem;
  border-radius: 0.3rem;
  border: none;
  margin: 10px 0;
  display: block;
  background: #e9e9e9;
}
img {
  border: 2px solid #f4f4f4;
  border-radius: 50%;
}
.inputs,
.outputs {
  padding: 0.5rem 1rem;
}
#generateAvatar {
  padding: 0.5rem;
  width: 100%;
  border-radius: 0.5rem;
  border: none;
  background-color: #7070ff;
  color: #f4f4f4;
  cursor:pointer;
}
@media screen and (max-width: 560px) {
  body {
    flex-direction: column-reverse;
  }
}
              
            
!

JS

              
                // selecting components
let firstname, lastname, generate, avatar, ctx, color;
firstname = document.getElementById("firstname");
lastname = document.getElementById("lastname");
generate = document.querySelector("form");

//creating canvas
avatar = document.createElement("canvas");
avatar.width = avatar.height = "200";
ctx = avatar.getContext("2d");
ctx.font = `${avatar.width / 2}px Arial`;
ctx.textAlign = "center";

//generating color
color = [
  "#5050ff",
  "#50ff50",
  "#ff5050",
  "#ff5000",
  "#ff0050",
  "#0050ff",
  "#00ff50",
  "#50ff00",
  "#5000ff",
];

//functions
//function to get name initials
function getInitials() {
  if (lastname.value == "") {
    let Initials = firstname.value[0].toUpperCase();
    return Initials;
  } else {
    let Initials = (firstname.value[0] + lastname.value[0]).toUpperCase();
    return Initials;
  }
}

//function to create avatar
function createAvatar(Initials) {
  let random = Math.floor(Math.random() * color.length);
  //clear canvas
  ctx.fillStyle = "#ffffff";
  ctx.fillRect(0, 0, avatar.width, avatar.height);

  //add background
  ctx.fillStyle = `${color[random]}60`;
  ctx.fillRect(0, 0, avatar.width, avatar.height);

  //add text
  ctx.fillStyle = color[random];
  ctx.fillText(Initials, avatar.width / 2, (65 / 100) * avatar.height);

  //generate as Image
  let dataURL = avatar.toDataURL();
  document.getElementById("img").src = dataURL;
}
//Event Listener
generate.addEventListener("submit", (e) => {
  e.preventDefault();
  createAvatar(getInitials());
});

// Preloaded avatar for example
createAvatar("KG");
              
            
!
999px

Console