【好用推荐】免费在线图片压缩工具,附源码

CSharp精选营2025-06-21 9:56

大家好，我是码农刚子。前几天填写备案资料时需要上传营业执照，要求2MB以内，老板发给我的文件有十几MB，无法上传，用网上的在线工具，又担心安全性。以前也经常遇到需要图片太大的问题，基本上都是找别人用vip办公软件处理的，每次都要麻烦别人，于是我就想着自己做一个，使用方便还安全。接下来我给大家介绍一下我的图片压缩工具，源码在结尾。

使用说明

  • 上传图片后，通过滑块调整压缩质量（0%-100%）
  • 点击"上传并压缩图片"按钮进行处理
  • 压缩完成后，右侧会显示压缩后的图片
  • 点击"下载压缩图片"按钮保存结果

先体验一下吧！👉压缩图片

支持格式

  • JPEG (.jpg, .jpeg)
  • PNG (.png)
  • GIF (.gif)
  • WebP (.webp)
  • BMP (.bmp)

自定义压缩质量

  • 使用滑块自由调整压缩质量（0%-100%）
  • 0% - 最高压缩（最小文件尺寸，最低质量）
  • 100% - 最低压缩（最大文件尺寸，最高质量）
  • 默认值设置为30% - 良好平衡点
  • 实时显示压缩质量百分比

技术实现

  • 前端使用Fetch API发送multipart/form-data请求
  • 后端使用ASP.NET Core处理文件上传
  • 使用ImageService进行图片压缩处理
  • 响应状态码：200（成功）、400（错误请求）

源码如下

话不多说，直接开干！

html 复制代码 
<div class="container">
        <header>
            <h1><i class="fas fa-file-image"></i> 免费在线图片压缩工具</h1>
            <p>保持画质清晰，快速缩小JPG/PNG/GIF/WebP文件，自定义压缩大小，压缩后可直接下载</p>
        </header>

        <div class="content">
            <div class="upload-section">
                <h2 class="section-title"><i class="fas fa-cloud-upload-alt"></i> 上传图片</h2>
                <a href="/" class="browse-btn refresh" target="_blank" title="码农观测站">首页</a>
                <button class="browse-btn refresh" onclick="window.location.reload();">刷新</button>
                <div class="upload-area" id="uploadArea">
                    <i class="fas fa-images"></i>
                    <h3>拖放图片到此处</h3>
                    <p>支持 JPG, PNG, GIF, WEBP 格式</p>
                    <button class="browse-btn">选择图片</button>
                    <input type="file" id="fileInput" class="file-input" accept="image/*">
                </div>

                <div class="preview-container">
                    <div class="preview-title"><i class="fas fa-eye"></i> 图片预览</div>
                    <div class="image-preview" id="imagePreview">
                        <img id="previewImage" src="" alt="预览图">
                    </div>

                    <div class="compression-control">
                        <div class="quality-label">
                            <span>压缩质量:</span>
                            <span class="quality-value" id="qualityValue">30%</span>
                        </div>
                        <div class="slider-container">
                            <input type="range" min="0" max="100" value="30" class="quality-slider" id="qualitySlider">
                        </div>
                        <div class="slider-ticks">
                            <span>0%</span>
                            <span>25%</span>
                            <span>50%</span>
                            <span>75%</span>
                            <span>100%</span>
                        </div>
                    </div>

                    <div class="progress-container" id="progressContainer">
                        <div class="progress-bar" id="progressBar"></div>
                    </div>

                    <button class="upload-btn" id="uploadBtn" disabled="">上传并压缩图片</button>

                    <div class="api-info">
                    </div>
                </div>
            </div>

            <div class="result-section">
                <h2 class="section-title"><i class="fas fa-download"></i> 压缩结果</h2>

                <div class="result-container">
                    <div class="result-content">
                        <div class="result-placeholder" id="resultPlaceholder">
                            <i class="fas fa-cloud-download-alt"></i>
                            <p>图片压缩后将显示在这里</p>
                            <p>您可以直接下载压缩后的图片</p>
                        </div>

                        <img id="compressedImage" class="compressed-image" src="" alt="压缩后的图片">
                        <a id="downloadLink" class="download-btn">
                            <i class="fas fa-download"></i> 下载压缩图片
                        </a>
                    </div>

                    <div class="response-area">
                        <h3 class="response-title"><i class="fas fa-comment-alt"></i> 处理状态</h3>
                        <div class="response-content" id="responseContent">
                            等待上传图片...
                        </div>
                    </div>
                </div>

                <div class="info-card">
                    <h4><i class="fas fa-info-circle"></i> 使用说明</h4>
                    <ul>
                        <li>上传图片后，通过滑块调整压缩质量（0%-100%）</li>
                        <li>点击"上传并压缩图片"按钮进行处理</li>
                        <li>压缩完成后，右侧会显示压缩后的图片</li>
                        <li>点击"下载压缩图片"按钮保存结果</li>
                    </ul>
                </div>
            </div>
        </div>

        <footer>
            <p>免费在线图片压缩工具 © 2025 | <a href="https://www.codeobservatory.cn" target="_blank" title="码农观测站">码农观测站</a></p>
        </footer>
    </div>
css 复制代码 
     * {
         margin: 0;
         padding: 0;
         box-sizing: border-box;
         font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
     }

     body {
         background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
         min-height: 100vh;
         display: flex;
         justify-content: center;
         align-items: center;
         padding: 20px;
     }

     .container {
         width: 100%;
         max-width: 1200px;
         background-color: rgba(255, 255, 255, 0.97);
         border-radius: 20px;
         box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
         overflow: hidden;
         display: flex;
         flex-direction: column;
     }

     header {
         background: linear-gradient(to right, #1a2980, #26d0ce);
         color: white;
         padding: 30px 40px;
         text-align: center;
         position: relative;
         overflow: hidden;
     }

         header::before {
             content: "";
             position: absolute;
             top: -50%;
             left: -50%;
             width: 200%;
             height: 200%;
             background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, transparent 70%);
             transform: rotate(30deg);
         }

         header h1 {
             font-size: 2.5rem;
             margin-bottom: 10px;
             display: flex;
             align-items: center;
             justify-content: center;
             gap: 15px;
             position: relative;
             text-shadow: 0 2px 4px rgba(0,0,0,0.2);
         }

         header p {
             font-size: 1.2rem;
             opacity: 0.9;
             max-width: 700px;
             margin: 15px auto 0;
             position: relative;
         }

     .content {
         display: flex;
         padding: 0;
         flex-wrap: wrap;
     }

     .upload-section {
         flex: 1;
         min-width: 350px;
         padding: 40px;
         border-right: 1px solid #eee;
         position: relative;
     }

     .result-section {
         flex: 1;
         min-width: 350px;
         padding: 40px;
         background-color: #f9f9ff;
         display: flex;
         flex-direction: column;
     }

     .section-title {
         font-size: 1.6rem;
         color: #333;
         margin-bottom: 25px;
         display: flex;
         align-items: center;
         gap: 10px;
         position: relative;
         padding-bottom: 10px;
     }

         .section-title::after {
             content: "";
             position: absolute;
             bottom: 0;
             left: 0;
             width: 50px;
             height: 3px;
             background: linear-gradient(to right, #1a2980, #26d0ce);
             border-radius: 3px;
         }

         .section-title i {
             color: #1a2980;
         }

     .upload-area {
         border: 3px dashed #1a2980;
         border-radius: 15px;
         padding: 40px 20px;
         text-align: center;
         cursor: pointer;
         transition: all 0.3s;
         background-color: #f0f4ff;
         margin-bottom: 25px;
         position: relative;
         overflow: hidden;
     }

         .upload-area:hover, .upload-area.dragover {
             background-color: #e6ebff;
             transform: translateY(-5px);
             box-shadow: 0 10px 25px rgba(26, 41, 128, 0.2);
         }

         .upload-area i {
             font-size: 4.5rem;
             color: #1a2980;
             margin-bottom: 20px;
             opacity: 0.8;
         }

         .upload-area h3 {
             font-size: 1.5rem;
             color: #444;
             margin-bottom: 15px;
         }

         .upload-area p {
             color: #666;
             margin-bottom: 20px;
             font-size: 1.05rem;
         }

     .browse-btn {
         background: linear-gradient(to right, #1a2980 0%, #26d0ce 100%);
         color: white;
         border: none;
         padding: 13px 35px;
         font-size: 1.1rem;
         border-radius: 50px;
         cursor: pointer;
         transition: all 0.3s;
         font-weight: 600;
         box-shadow: 0 5px 15px rgba(26, 41, 128, 0.3);
         position: relative;
         overflow: hidden;
     }

         .browse-btn:hover {
             transform: translateY(-3px);
             box-shadow: 0 8px 20px rgba(26, 41, 128, 0.4);
         }

         .browse-btn:active {
             transform: translateY(1px);
         }

         .browse-btn.refresh {
             position: absolute;
             top: 40px;
             right: 40px;
             padding: 7px 25px;
         }

     .file-input {
         display: none;
     }

     .preview-container {
         margin-top: 30px;
         text-align: center;
     }

     .preview-title {
         font-size: 1.3rem;
         margin-bottom: 20px;
         color: #555;
         display: flex;
         align-items: center;
         justify-content: center;
         gap: 10px;
     }

     .image-preview {
         width: 100%;
         max-height: 220px;
         border-radius: 12px;
         overflow: hidden;
         box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
         display: none;
         margin: 0 auto 25px;
         border: 1px solid #eee;
     }

         .image-preview img {
             width: 100%;
             height: 100%;
             object-fit: contain;
             background: #f8f8f8;
         }

     .compression-control {
         background: white;
         border-radius: 12px;
         padding: 20px;
         margin-bottom: 25px;
         box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
     }

     .quality-label {
         display: flex;
         justify-content: space-between;
         margin-bottom: 15px;
         font-size: 1.1rem;
         color: #444;
     }

     .quality-value {
         font-weight: 700;
         color: #1a2980;
         font-size: 1.2rem;
         min-width: 45px;
         text-align: right;
     }

     .slider-container {
         position: relative;
         height: 40px;
     }

     .quality-slider {
         width: 100%;
         height: 10px;
         -webkit-appearance: none;
         background: linear-gradient(to right, #ff416c, #ff4b2b, #ff9500, #ffcc00, #a8e063, #56ab2f);
         outline: none;
         border-radius: 5px;
     }

         .quality-slider::-webkit-slider-thumb {
             -webkit-appearance: none;
             width: 25px;
             height: 25px;
             border-radius: 50%;
             background: #1a2980;
             cursor: pointer;
             box-shadow: 0 2px 10px rgba(0,0,0,0.2);
             border: 3px solid white;
         }

         .quality-slider::-moz-range-thumb {
             width: 25px;
             height: 25px;
             border-radius: 50%;
             background: #1a2980;
             cursor: pointer;
             box-shadow: 0 2px 10px rgba(0,0,0,0.2);
             border: 3px solid white;
         }

     .slider-ticks {
         display: flex;
         justify-content: space-between;
         padding: 0 12px;
         font-size: 0.85rem;
         color: #777;
         margin-top: 5px;
     }

     .upload-btn {
         width: 100%;
         padding: 16px;
         background: linear-gradient(to right, #00c853 0%, #64dd17 100%);
         color: white;
         border: none;
         border-radius: 12px;
         font-size: 1.2rem;
         font-weight: 600;
         cursor: pointer;
         transition: all 0.3s;
         box-shadow: 0 6px 18px rgba(0, 200, 83, 0.3);
         display: block;
         position: relative;
         overflow: hidden;
     }

         .upload-btn:hover {
             transform: translateY(-3px);
             box-shadow: 0 9px 22px rgba(0, 200, 83, 0.4);
         }

         .upload-btn:disabled {
             background: #cccccc;
             cursor: not-allowed;
             transform: none;
             box-shadow: none;
         }

     .progress-container {
         height: 10px;
         background-color: #e0e0e0;
         border-radius: 5px;
         margin: 20px 0;
         overflow: hidden;
         display: none;
     }

     .progress-bar {
         height: 100%;
         background: linear-gradient(to right, #1a2980 0%, #26d0ce 100%);
         width: 0%;
         transition: width 0.4s ease;
     }

     .comparison-container {
         display: flex;
         justify-content: space-around;
         margin: 25px 0;
         gap: 20px;
     }

     .comparison-item {
         text-align: center;
         flex: 1;
         background: white;
         padding: 20px 15px;
         border-radius: 12px;
         box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
     }

         .comparison-item h4 {
             margin-bottom: 12px;
             color: #555;
             font-size: 1.15rem;
         }

     .size-info {
         font-weight: 700;
         font-size: 1.3rem;
         color: #1a2980;
     }

     .api-info {
         background: #e3f2fd;
         padding: 15px;
         border-radius: 10px;
         margin-top: 20px;
         font-family: monospace;
         font-size: 0.95rem;
         color: #1a2980;
     }

     footer {
         text-align: center;
         padding: 25px;
         color: #666;
         background-color: #f5f5f5;
         border-top: 1px solid #eee;
         font-size: 1.05rem;
     }

     .result-container {
         background: white;
         border-radius: 15px;
         padding: 25px;
         box-shadow: 0 7px 20px rgba(0, 0, 0, 0.07);
         min-height: 180px;
         border: 1px solid #f0f0f0;
         flex-grow: 1;
         display: flex;
         flex-direction: column;
     }

     .result-content {
         flex-grow: 1;
         display: flex;
         flex-direction: column;
         justify-content: center;
         align-items: center;
     }

     .compressed-image {
         max-width: 100%;
         max-height: 250px;
         border-radius: 12px;
         box-shadow: 0 5px 15px rgba(0,0,0,0.1);
         margin-bottom: 25px;
         border: 1px solid #eee;
         display: none;
     }

     .download-btn {
         display: inline-block;
         background: linear-gradient(to right, #1a2980 0%, #26d0ce 100%);
         color: white;
         padding: 14px 30px;
         font-size: 1.1rem;
         font-weight: 600;
         border-radius: 50px;
         text-decoration: none;
         transition: all 0.3s;
         box-shadow: 0 5px 15px rgba(26, 41, 128, 0.3);
         display: none;
         align-items: center;
         gap: 10px;
     }

         .download-btn:hover {
             transform: translateY(-3px);
             box-shadow: 0 8px 20px rgba(26, 41, 128, 0.4);
         }

     .info-card {
         background: white;
         border-radius: 15px;
         padding: 25px;
         box-shadow: 0 7px 20px rgba(0, 0, 0, 0.07);
         margin-bottom: 30px;
         border: 1px solid #f0f0f0;
     }

         .info-card h4 {
             color: #1a2980;
             margin-bottom: 20px;
             font-size: 1.3rem;
             display: flex;
             align-items: center;
             gap: 12px;
         }

         .info-card ul {
             list-style-type: none;
             padding-left: 5px;
         }

         .info-card li {
             margin-bottom: 14px;
             padding-left: 32px;
             position: relative;
             font-size: 1.05rem;
             color: #555;
             line-height: 1.5;
         }

             .info-card li:before {
                 content: "•";
                 color: #1a2980;
                 font-size: 2rem;
                 position: absolute;
                 left: 0;
                 top: -8px;
             }

     .response-area {
         background: white;
         border-radius: 15px;
         padding: 25px;
         box-shadow: 0 7px 20px rgba(0, 0, 0, 0.07);
         min-height: 100px;
         border: 1px solid #f0f0f0;
         margin-top: 20px;
     }

     .response-title {
         color: #1a2980;
         margin-bottom: 15px;
         font-size: 1.3rem;
         display: flex;
         align-items: center;
         gap: 12px;
     }

     .response-content {
         font-size: 1.1rem;
         line-height: 1.6;
         color: #555;
         min-height: 60px;
         display: flex;
         align-items: center;
         justify-content: center;
         padding: 15px;
         text-align: center;
     }

     @media (max-width: 768px) {
         body {
         padding:20px 0;
         }
         header {
             padding: 30px 20px;
         }
         .content {
             flex-direction: column;
         }

         .upload-section {
             border-right: none;
             border-bottom: 1px solid #eee;
             padding:20px;
         }
         .result-section {
         padding:20px;
         }
         header h1 {
             font-size: 2rem;
         }

         header p {
             font-size: 1rem;
         }
         .browse-btn.refresh {
         top:20px;
         right:20px;
         }
         a.browse-btn.refresh {
         right:130px;
         }
     }

     .success-message {
         color: #00c853;
         font-weight: 600;
     }

     .error-message {
         color: #f44336;
         font-weight: 600;
     }

     .result-placeholder {
         text-align: center;
         color: #777;
         font-size: 1.1rem;
         padding: 40px 20px;
     }

         .result-placeholder i {
             font-size: 4rem;
             color: #e0e0e0;
             margin-bottom: 20px;
         }
jsvascript 复制代码 
 document.addEventListener('DOMContentLoaded', function () {
     const uploadArea = document.getElementById('uploadArea');
     const fileInput = document.getElementById('fileInput');
     const uploadBtn = document.getElementById('uploadBtn');
     const imagePreview = document.getElementById('imagePreview');
     const previewImage = document.getElementById('previewImage');
     const responseContent = document.getElementById('responseContent');
     const progressContainer = document.getElementById('progressContainer');
     const progressBar = document.getElementById('progressBar');
     const originalSize = document.getElementById('originalSize');
     const compressedSize = document.getElementById('compressedSize');
     const qualitySlider = document.getElementById('qualitySlider');
     const qualityValue = document.getElementById('qualityValue');
     const compressedImage = document.getElementById('compressedImage');
     const downloadLink = document.getElementById('downloadLink');
     const resultPlaceholder = document.getElementById('resultPlaceholder');

     // 压缩质量滑块事件
     qualitySlider.addEventListener('input', function () {
         qualityValue.textContent = this.value + '%';
     });

     // 点击上传区域触发文件选择
     uploadArea.addEventListener('click', () => {
         fileInput.click();
     });

     // 拖放功能
     ['dragenter', 'dragover', 'dragleave', 'drop'].forEach(eventName => {
         uploadArea.addEventListener(eventName, preventDefaults, false);
     });

     function preventDefaults(e) {
         e.preventDefault();
         e.stopPropagation();
     }

     ['dragenter', 'dragover'].forEach(eventName => {
         uploadArea.addEventListener(eventName, highlight, false);
     });

     ['dragleave', 'drop'].forEach(eventName => {
         uploadArea.addEventListener(eventName, unhighlight, false);
     });

     function highlight() {
         uploadArea.classList.add('dragover');
     }

     function unhighlight() {
         uploadArea.classList.remove('dragover');
     }

     // 处理文件放置
     uploadArea.addEventListener('drop', handleDrop, false);

     function handleDrop(e) {
         const dt = e.dataTransfer;
         const files = dt.files;
         if (files.length) {
             handleFiles(files);
         }
     }

     // 处理文件选择
     fileInput.addEventListener('change', function () {
         if (this.files.length) {
             handleFiles(this.files);
         }
     });

     // 处理选中的文件
     function handleFiles(files) {
         const file = files[0];
         if (!file.type.match('image.*')) {
             responseContent.innerHTML = '<span class="error-message">错误：请选择图片文件（JPG, PNG, GIF, WEBP）</span>';
             return;
         }

         // 重置结果区域
         compressedImage.style.display = 'none';
         downloadLink.style.display = 'none';
         resultPlaceholder.style.display = 'block';

         // 显示预览
         const reader = new FileReader();
         reader.onload = function (e) {
             previewImage.src = e.target.result;
             imagePreview.style.display = 'block';
             uploadBtn.style.display = 'block';
             uploadBtn.disabled = false;
         };
         reader.readAsDataURL(file);

         // 更新响应内容
         responseContent.innerHTML = '<span class="success-message">图片已选择，点击"上传并压缩图片"按钮开始处理...</span>';
     }

     // 上传按钮点击事件
     uploadBtn.addEventListener('click', function () {
         if (!fileInput.files.length) return;

         const file = fileInput.files[0];
         const quality = parseInt(qualitySlider.value);
         const formData = new FormData();
         formData.append('imageFile', file);
         formData.append('compressionQuality', quality);

         // 显示进度条
         progressContainer.style.display = 'block';
         progressBar.style.width = '0%';

         // 禁用上传按钮
         uploadBtn.disabled = true;
         uploadBtn.textContent = '处理中...';
         uploadBtn.style.background = 'linear-gradient(to right, #ff9800 0%, #ff5722 100%)';

         // 更新响应内容
         responseContent.innerHTML = '<span class="success-message">正在上传并压缩图片，请稍候...</span>';

         // 模拟进度更新
         const progressInterval = setInterval(() => {
             const currentWidth = parseInt(progressBar.style.width) || 0;
             if (currentWidth < 90) {
                 progressBar.style.width = (currentWidth + 10) + '%';
             }
         }, 300);

         // 发送请求到API
         fetch('/api/yourapiname', {
             method: 'POST',
             body: formData
         })
             .then(response => {
                 debugger
                 clearInterval(progressInterval);
                 progressBar.style.width = '100%';

                 if (response.ok) {
                     return response.blob();
                 } else if (response.status === 400) {
                     return response.text().then(text => {
                         throw new Error(text || '无效请求');
                     });
                 } else {
                     throw new Error(`请求失败，状态码: ${response.status}`);
                 }
             })
             .then(blob => {
                 // 创建压缩图片的URL
                 const compressedUrl = URL.createObjectURL(blob);

                 // 显示压缩后的图片
                 compressedImage.src = compressedUrl;
                 compressedImage.style.display = 'block';

                 // 设置下载链接
                 downloadLink.href = compressedUrl;
                 downloadLink.download = `compressed_${fileInput.files[0].name}`;
                 downloadLink.style.display = 'inline-block';

                 // 隐藏占位符
                 resultPlaceholder.style.display = 'none';

                 // 更新UI
                 setTimeout(() => {
                     responseContent.innerHTML = '<span class="success-message">图片压缩成功！可下载压缩后的图片</span>';
                     uploadBtn.textContent = '上传成功！';
                     uploadBtn.style.background = 'linear-gradient(to right, #00c853 0%, #64dd17 100%)';
                 }, 500);
             })
             .catch(error => {
                 clearInterval(progressInterval);
                 progressBar.style.backgroundColor = '#f44336';
                 responseContent.innerHTML = `<span class="error-message">错误: ${error.message}</span>`;
                 uploadBtn.textContent = '上传失败，重试';
                 uploadBtn.disabled = false;
                 uploadBtn.style.background = 'linear-gradient(to right, #f44336 0%, #e91e63 100%)';
             });
     });
 });

版权声明：本文为作者原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。

作者: 码农刚子

原文链接: https://www.codeobservatory.cn/archives/fb2da740.html

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