Last edited: 12th August 2024
You can easily overlay text on an image using HTML and CSS. This method involves creating a container, such as a <div> element, to hold both the image (using a canvas element) and the text (inside another <div> element). By utilizing the CSS position property, you can effortlessly position the text over the image. In this tutorial, I'll guide you through the process of adding text to an image and saving it to your computer.I have used the Canvas element in this example and I have explained why.
Example:
<!DOCTYPE html>
<html lang="en">
<head>
<title>Text over image example</title>
<link href="https://ajax.googleapis.com/ajax/libs/jqueryui/1.10.3/themes/smoothness/jquery-ui.css" rel="stylesheet" type="text/css"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.10.3/jquery-ui.min.js"></script>
<style>
.mainContainer {
position: relative;
padding: 0;
min-width: 250px;
min-height: 250px;
display: inline-block;
margin: 0 auto;
}
img {
border: none;
max-width: 100%;
}
#textArea {
display: block;
padding: 10px;
}
#theText {
position: absolute;
top: 90px;
left: 0;
background: rgba(0, 0, 0, 0.1);
color: #fff;
width: auto;
padding: 5px;
text-align: left;
border: dashed 2px #ff7f27;
font: 15px Calibri;
display: block;
cursor: move;
}
canvas {
max-width: 100%;
}
</style>
</head>
<body>
<!-- File upload -->
<p>
<input type="submit" id="btChooseImage" onclick="chooseImage()" value="Select an image" />
</p>
<input type="file" id="file" onchange="showImage(this)" style="display: none; visibility: hidden; width: 1px;" />
<!-- Textarea to enter some texts -->
<p>
<textarea onkeyup="writeText(this)" id="textArea" placeholder="Enter some value for text" rows="2" cols="50"></textarea>
</p>
<div>
<!-- The parent container: image and container for text -->
<div class="mainContainer" id="mainContainer">
<!-- THE DEFAULT IMAGE. You can select a different image. -->
<img src="https://www.encodedna.com/images/theme/easy-image-resizer.jpg" id="myimage" alt="" />
<!-- The text, which is also draggable -->
<div id="theText" onmousedown="this.style.border = 'dashed 2px #FF7F27';">sample text</div>
</div>
<!-- Button to save the image with the text -->
<p><input type="button" onclick="saveImageWithText();" id="bt" value="Save the Image" /></p>
</div>
<script>
// Make the text element draggable.
$(document).ready(function() {
$('#theText').draggable({
containment: 'parent' // set draggable area.
});
});
// Select image and show it
function chooseImage() {
document.getElementById('file').click();
}
function showImage(fl) {
if (fl.files.length > 0) {
let reader = new FileReader();
reader.onload = function(e) {
let img = new Image();
img.onload = function() {
if (this.width > screen.width || this.height > screen.height) {
alert('Please select a small image. The image width and height should be less than the screen width and height.');
document.getElementById('theText').style.display = 'none';
document.getElementById('bt').style.display = 'none';
document.getElementById('textArea').style.display = 'none';
document.getElementById('myimage').src = '';
} else {
document.getElementById('theText').style.display = 'block';
document.getElementById('bt').style.display = 'block';
document.getElementById('textArea').style.display = 'block';
}
}
img.src = e.target.result; // actual image
document.getElementById('myimage').src = reader.result; // Add the image on the form
};
reader.readAsDataURL(fl.files[0]);
}
}
let textContainer;
let t = 'sample text';
// Get the values that you have entered in the textarea and write it in the DIV over the image
function writeText(ele) {
t = ele.value;
document.getElementById('theText').innerHTML = t.replace(/\n\r?/g, '<br />');
}
// Finally, save the image with text over it
function saveImageWithText() {
textContainer = document.getElementById('theText'); // The element with the text
// Create an image object
let img = new Image();
img.src = document.getElementById('myimage').src;
// Create a canvas object
let canvas = document.createElement("canvas");
// Wait till the image is loaded
img.onload = function() {
drawImage();
downloadImage(img.src.replace(/^.*[\\\/]/, '')); // Download the processed image
}
// Draw the image on the canvas
function drawImage() {
let ctx = canvas.getContext("2d"); // Create canvas context
// Assign width and height
canvas.width = img.width;
canvas.height = img.height;
// Draw the image
ctx.drawImage(img, 0, 0);
textContainer.style.border = 0;
// Get the padding etc.
let left = parseInt(window.getComputedStyle(textContainer).left);
let right = textContainer.getBoundingClientRect().right;
let top = parseInt(window.getComputedStyle(textContainer).top, 0);
let center = textContainer.getBoundingClientRect().width / 2;
let paddingTop = window.getComputedStyle(textContainer).paddingTop.replace('px', '');
let paddingLeft = window.getComputedStyle(textContainer).paddingLeft.replace('px', '');
let paddingRight = window.getComputedStyle(textContainer).paddingRight.replace('px', '');
// Get text alignment, color, and font of the text
let txtAlign = window.getComputedStyle(textContainer).textAlign;
let color = window.getComputedStyle(textContainer).color;
let fnt = window.getComputedStyle(textContainer).font;
// Assign text properties to the context
ctx.font = fnt;
ctx.fillStyle = color;
ctx.textAlign = txtAlign;
// Now, we need the coordinates of the text
let x; // coordinate
if (txtAlign === 'right') {
x = right + parseInt(paddingRight) - 11;
}
if (txtAlign === 'left') {
x = left + parseInt(paddingLeft);
}
if (txtAlign === 'center') {
x = center + left;
}
// Get the text (it can be a word or a sentence) to write over the image
let str = t.replace(/\n\r?/g, '<br />').split('<br />');
// Finally, draw the text using Canvas fillText() method
str.forEach((line, i) => {
ctx.fillText(
line.replace('</div>', '').replace('<br>', '').replace(';', ''),
x,
parseInt(paddingTop, 10) + parseInt(top, 10) + 10 + (i * 15)
);
});
}
// Download the processed image
function downloadImage(img_name) {
let a = document.createElement('a');
a.href = canvas.toDataURL("image/png");
a.download = img_name;
document.body.appendChild(a);
a.click();
}
}
</script>
</body>
</html>Note: It is just an example and therefore has some limitations.
Let me explain, How this code works.
In the markup section, I have added a <div> element that serves as a container, an image (<img>) inside the parent <div> element and another <div>, which has the text (you can drag this element anywhere on the image). Using CSS, I am placing the text over the image.
Using jQuery UI
I am using jQuery UI to make the text moveable (so I can drag and place the text anywhere on the image). I have added jQuery CDNs in the script section (above).
I have also set a draggable area limit , so the text (the <div> element) stays over the image and doesn’t go outside the image. See this code inside the script.
$(document).ready(function() { $(function() { $('#theText').draggable({ containment: 'parent' // set (or limit) the draggable area. }); }); });
The CSS Style
There are five elements. So, I had to style them accordingly. The CSS for ".mainContainer" and "#theText" is important here.
The main container or the parent container has a "relative" position and the text element (which is a DIV), has an absolute position. Child elements or "absolute elements are positioned relative" to the parent element.
Explaining the Script
Now, let’s get back to the script.
It has few methods and most importantly, this 👉 let saveImageWithText = () => { }. Its here where actually I am “writing the text over the image” using a Canvas. Since, I had to recreate the image with the text on a Canvas element using its context.
Here, I am extracting all the properties of the text element, like the padding, font, the text colour, the alignment and finally its coordinates to place the text precisely over the image and save it.
Its just an example and has limitation. This is not a compete project. So, yes you will find some features missing.
You can add more features or create a toolbox from where you can assign colours to the text, or choose a different font name or font size etc.
🚀 Edit: I have designed a tool to add text to a picture using the above example, with some advanced features. If you like it, please don't forget to share it.