How to Make a Dynamic Image Editor With Effects in HTML5, CSS3 & JavaScript

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In this tutorial, I will teach you how to make an Image Editor Using JavaScript, HTML5, and CSS3. The complete source code of this JavaScript image editor is given below.

I have also provided a download link at the end of this article through which you can download the full source code (including image files).

JavaScript Image Editor Source Code

index.html

<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title>Image Editor JavaScript</title>
    <link rel="stylesheet" href="style.css">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="https://unpkg.com/[email protected]/css/boxicons.min.css">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.1.1/css/all.min.css"/>
  </head>
  <body>
    <div class="container disable">
        <h2>Easy Image Editor</h2>
        <div class="wrapper">
            <div class="editor-panel">
                <div class="filter">
                    <label class="title">Filters</label>
                    <div class="options">
                        <button id="brightness" class="active">Brightness</button>
                        <button id="saturation">Saturation</button>
                        <button id="inversion">Inversion</button>
                        <button id="grayscale">Grayscale</button>
                    </div>
                    <div class="slider">
                        <div class="filter-info">
                            <p class="name">Brighteness</p>
                            <p class="value">100%</p>
                        </div>
                        <input type="range" value="100" min="0" max="200">
                    </div>
                </div>
                <div class="rotate">
                    <label class="title">Rotate & Flip</label>
                    <div class="options">
                        <button id="left"><i class="fa-solid fa-rotate-left"></i></button>
                        <button id="right"><i class="fa-solid fa-rotate-right"></i></button>
                        <button id="horizontal"><i class='bx bx-reflect-vertical'></i></button>
                        <button id="vertical"><i class='bx bx-reflect-horizontal' ></i></button>
                    </div>
                </div>
            </div>
            <div class="preview-img">
                <img src="image-placeholder.svg" alt="preview-img">
            </div>
        </div>
        <div class="controls">
            <button class="reset-filter">Reset Filters</button>
            <div class="row">
                <input type="file" class="file-input" accept="image/*" hidden>
                <button class="choose-img">Choose Image</button>
                <button class="save-img">Save Image</button>
            </div>
        </div>
    </div>

    <script src="script.js"></script>
    
  </body>
</html>

script.js

const fileInput = document.querySelector(".file-input"),
filterOptions = document.querySelectorAll(".filter button"),
filterName = document.querySelector(".filter-info .name"),
filterValue = document.querySelector(".filter-info .value"),
filterSlider = document.querySelector(".slider input"),
rotateOptions = document.querySelectorAll(".rotate button"),
previewImg = document.querySelector(".preview-img img"),
resetFilterBtn = document.querySelector(".reset-filter"),
chooseImgBtn = document.querySelector(".choose-img"),
saveImgBtn = document.querySelector(".save-img");

let brightness = "100", saturation = "100", inversion = "0", grayscale = "0";
let rotate = 0, flipHorizontal = 1, flipVertical = 1;

const loadImage = () => {
    let file = fileInput.files[0];
    if(!file) return;
    previewImg.src = URL.createObjectURL(file);
    previewImg.addEventListener("load", () => {
        resetFilterBtn.click();
        document.querySelector(".container").classList.remove("disable");
    });
}

const applyFilter = () => {
    previewImg.style.transform = `rotate(${rotate}deg) scale(${flipHorizontal}, ${flipVertical})`;
    previewImg.style.filter = `brightness(${brightness}%) saturate(${saturation}%) invert(${inversion}%) grayscale(${grayscale}%)`;
}

filterOptions.forEach(option => {
    option.addEventListener("click", () => {
        document.querySelector(".active").classList.remove("active");
        option.classList.add("active");
        filterName.innerText = option.innerText;

        if(option.id === "brightness") {
            filterSlider.max = "200";
            filterSlider.value = brightness;
            filterValue.innerText = `${brightness}%`;
        } else if(option.id === "saturation") {
            filterSlider.max = "200";
            filterSlider.value = saturation;
            filterValue.innerText = `${saturation}%`
        } else if(option.id === "inversion") {
            filterSlider.max = "100";
            filterSlider.value = inversion;
            filterValue.innerText = `${inversion}%`;
        } else {
            filterSlider.max = "100";
            filterSlider.value = grayscale;
            filterValue.innerText = `${grayscale}%`;
        }
    });
});

const updateFilter = () => {
    filterValue.innerText = `${filterSlider.value}%`;
    const selectedFilter = document.querySelector(".filter .active");

    if(selectedFilter.id === "brightness") {
        brightness = filterSlider.value;
    } else if(selectedFilter.id === "saturation") {
        saturation = filterSlider.value;
    } else if(selectedFilter.id === "inversion") {
        inversion = filterSlider.value;
    } else {
        grayscale = filterSlider.value;
    }
    applyFilter();
}

rotateOptions.forEach(option => {
    option.addEventListener("click", () => {
        if(option.id === "left") {
            rotate -= 90;
        } else if(option.id === "right") {
            rotate += 90;
        } else if(option.id === "horizontal") {
            flipHorizontal = flipHorizontal === 1 ? -1 : 1;
        } else {
            flipVertical = flipVertical === 1 ? -1 : 1;
        }
        applyFilter();
    });
});

const resetFilter = () => {
    brightness = "100"; saturation = "100"; inversion = "0"; grayscale = "0";
    rotate = 0; flipHorizontal = 1; flipVertical = 1;
    filterOptions[0].click();
    applyFilter();
}

const saveImage = () => {
    const canvas = document.createElement("canvas");
    const ctx = canvas.getContext("2d");
    canvas.width = previewImg.naturalWidth;
    canvas.height = previewImg.naturalHeight;
    
    ctx.filter = `brightness(${brightness}%) saturate(${saturation}%) invert(${inversion}%) grayscale(${grayscale}%)`;
    ctx.translate(canvas.width / 2, canvas.height / 2);
    if(rotate !== 0) {
        ctx.rotate(rotate * Math.PI / 180);
    }
    ctx.scale(flipHorizontal, flipVertical);
    ctx.drawImage(previewImg, -canvas.width / 2, -canvas.height / 2, canvas.width, canvas.height);
    
    const link = document.createElement("a");
    link.download = "image.jpg";
    link.href = canvas.toDataURL();
    link.click();
}

filterSlider.addEventListener("input", updateFilter);
resetFilterBtn.addEventListener("click", resetFilter);
saveImgBtn.addEventListener("click", saveImage);
fileInput.addEventListener("change", loadImage);
chooseImgBtn.addEventListener("click", () => fileInput.click());

style.css

/* Import Google font - Poppins */
@import url('https://fonts.googleapis.com/css2?family=Poppins:[email protected];500;600&display=swap');
*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Poppins', sans-serif;
}
body{
  display: flex;
  padding: 10px;
  min-height: 100vh;
  align-items: center;
  justify-content: center;
  background: #E3F2FD;
}
.container{
  width: 850px;
  padding: 30px 35px 35px;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}
.container.disable .editor-panel,
.container.disable .controls .reset-filter,
.container.disable .controls .save-img{
  opacity: 0.5;
  pointer-events: none;
}
.container h2{
  margin-top: -8px;
  font-size: 22px;
  font-weight: 500;
}
.container .wrapper{
  display: flex;
  margin: 20px 0;
  min-height: 335px;
}
.wrapper .editor-panel{
  padding: 15px 20px;
  width: 280px;
  border-radius: 5px;
  border: 1px solid #ccc;
}
.editor-panel .title{
  display: block;
  font-size: 16px;
  margin-bottom: 12px;
}
.editor-panel .options, .controls{
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}
.editor-panel button{
  outline: none;
  height: 40px;
  font-size: 14px;
  color: #6C757D;
  background: #fff;
  border-radius: 3px;
  margin-bottom: 8px;
  border: 1px solid #aaa;
}
.editor-panel .filter button{
  width: calc(100% / 2 - 4px);
}
.editor-panel button:hover{
  background: #f5f5f5;
}
.filter button.active{
  color: #fff;
  border-color: #5372F0;
  background: #5372F0;
}
.filter .slider{
  margin-top: 12px;
}
.filter .slider .filter-info{
  display: flex;
  color: #464646;
  font-size: 14px;
  justify-content: space-between;
}
.filter .slider input{
  width: 100%;
  height: 5px;
  accent-color: #5372F0;
}
.editor-panel .rotate{
  margin-top: 17px;
}
.editor-panel .rotate button{
  display: flex;
  align-items: center;
  justify-content: center;
  width: calc(100% / 4 - 3px);
}
.rotate .options button:nth-child(3),
.rotate .options button:nth-child(4){
  font-size: 18px;
}
.rotate .options button:active{
  color: #fff;
  background: #5372F0;
  border-color: #5372F0;
}
.wrapper .preview-img{
  flex-grow: 1;
  display: flex;
  overflow: hidden;
  margin-left: 20px;
  border-radius: 5px;
  align-items: center;
  justify-content: center;
}
.preview-img img{
  max-width: 490px;
  max-height: 335px;
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.controls button{
  padding: 11px 20px;
  font-size: 14px;
  border-radius: 3px;
  outline: none;
  color: #fff;
  cursor: pointer;
  background: none;
  transition: all 0.3s ease;
  text-transform: uppercase;
}
.controls .reset-filter{
  color: #6C757D;
  border: 1px solid #6C757D;
}
.controls .reset-filter:hover{
  color: #fff;
  background: #6C757D;
}
.controls .choose-img{
  background: #6C757D;
  border: 1px solid #6C757D;
}
.controls .save-img{
  margin-left: 5px;
  background: #5372F0;
  border: 1px solid #5372F0;
}

@media screen and (max-width: 760px) {
  .container{
    padding: 25px;
  }
  .container .wrapper{
    flex-wrap: wrap-reverse;
  }
  .wrapper .editor-panel{
    width: 100%;
  }
  .wrapper .preview-img{
    width: 100%;
    margin: 0 0 15px;
  }
}

@media screen and (max-width: 500px) {
  .controls button{
    width: 100%;
    margin-bottom: 10px;
  }
  .controls .row{
    width: 100%;
  }
  .controls .row .save-img{
    margin-left: 0px;
  }
}

Project Screenshots

JavaScript Image Editor - Choose Image
JavaScript Image Editor – Choose Image
JavaScript Image Editor - Filters (brightness, saturation, inversion, grayscale), Rotate & Flip
JavaScript Image Editor – Filters (brightness, saturation, inversion, grayscale), Rotate & Flip

Download Full Source Code (including images)

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