什么是 PDF 万能百宝箱？
PDF 万能百宝箱是一款在线 PDF 处理工具集，集成了六大常用功能：PDF 调整、PDF 合并、PDF 拆分、PDF 压缩、PDF 转图片和图片转 PDF。所有操作完全在浏览器本地完成，您的文件不会上传到任何服务器，充分保护隐私安全。
功能详解：
- PDF 调整：上传 PDF 后左右分栏预览，左侧缩略图拖拽调整页面顺序，右侧预览区可删除页面、顺时针/逆时针旋转页面，支持撤销删除
- PDF 合并：将多个 PDF 文件按顺序合并为一个文件，适合整合合同附件、合并报告等场景
- PDF 拆分：上传 PDF 后左右分栏预览，左侧缩略图点击选页，右侧实时查看选中页面完整内容；也可输入页码范围（如 1-3,5,7），支持全角字符和空格容错
- PDF 压缩：提供无损和有损两种压缩模式。无损模式去除 PDF 内部冗余结构；有损模式将页面渲染为较低质量的 JPEG 图片后重建 PDF，压缩效果更显著
- PDF 转图片：将 PDF 每一页渲染为高清 PNG 或 JPEG 图片，支持 1x/2x/3x 缩放倍率，可逐页或批量下载
- 图片转 PDF：将多张 PNG/JPEG 图片合成为一个 PDF 文件，支持 A4 适配（居中缩放）和原始大小两种页面布局
适用场景：行政人员合并合同附件、HR 整理扫描件、大学生合并作业 PDF、发票报销整理、合同签名页提取、电子文档压缩发送、PDF 页面旋转和排序等。
技术说明：合并、拆分、调整、图片转 PDF 使用 pdf-lib 库实现；PDF 转图片和有损压缩使用 Mozilla PDF.js 渲染引擎。加密 PDF 文件暂不支持处理。
What is the PDF Toolkit?
The PDF Toolkit is an all-in-one online PDF processing tool with six essential functions: Adjust, Merge, Split, Compress, PDF to Image, and Image to PDF. All operations run entirely in your browser — your files never leave your device, ensuring complete privacy.
Feature details:
- PDF Adjust: Split-panel preview after upload — drag thumbnails on the left to reorder pages; use the right panel to delete pages or rotate them clockwise/counter-clockwise, with undo delete support
- PDF Merge: Combine multiple PDFs into one in order — ideal for consolidating contracts, reports, or attachments
- PDF Split: Split-panel preview after upload — click thumbnails on the left to select pages, view full content on the right; or type page ranges (e.g., 1-3,5,7) with full-width character and space tolerance
- PDF Compress: Two modes — lossless (removes internal redundancy) and lossy (re-renders pages as JPEG at lower quality for greater size reduction)
- PDF to Image: Render each PDF page as a high-quality PNG or JPEG. Supports 1x/2x/3x scaling with per-page or batch download
- Image to PDF: Combine multiple PNG/JPEG images into a single PDF. Choose A4 fit (centered with scaling) or original image size
Common use cases: merging contract attachments, organizing scanned documents, combining homework PDFs, extracting signature pages, compressing files for email, rotating and reordering PDF pages, and more.
Technical note: Merge, Split, Adjust, and Image to PDF use the pdf-lib library. PDF to Image and lossy compression use Mozilla's PDF.js rendering engine. Encrypted PDFs are not supported.