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AI摘要
HunYuan-Lite

大家好，这里是码农观测站，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！

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<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>
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* {
    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;
    }
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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%)';
            });
    });
});