Nebula 1.9.0 是一次PDF 大版本。云上的 PDF 从「只能预览」升级为一个完整的页面工具箱:在独立窗口里翻页 / 缩放阅读,用缩略图拖拽重排、旋转、删除、提取、合并页面;此外还能加页码、加文字水印(可调透明度 / 角度 / 平铺)、提取文本(复制或导出 txt)、以及压缩瘦身(省云存储)。关键在于:所有 PDF 解析与改写都由纯 Rust 的 lopdf 在后端完成,前端只用 pdf.js 渲染缩略图与阅读页——大文件不卡界面、无任何原生依赖、三平台一致。Nebula 1.9.0 is aPDF release. Cloud PDFs go from preview-only to a full page toolbox:read with pagination / zoomin a standalone window, andreorder by drag, rotate, delete, extract and mergepages from a thumbnail grid. On top of that:add page numbers,stamp a text watermark(adjustable opacity / angle / tiling),extract text(copy or export to txt), andcompressto shrink cloud storage. The key point:all PDF parsing and rewriting runs in pure-Rust lopdf on the backend, with the frontend only rendering thumbnails and reading pages via pdf.js — big files never freeze the UI, there are no native dependencies, and behavior is identical across platforms.版本信息 | Release Information项目地址 | Repositoryhttps://github.com/devlive-community/nebula官方网站 | Official Websitehttps://nebula.devlive.org/版本号 | Versionv1.9.0发布日期 | Release Date2026年7月20日 | July 20, 2026PDF 阅读与页面管理 | Reading Page Management翻页缩放阅读:双击缩略图进入全页阅读,pdf.js 按页面旋转角高清渲染;方向键 / 按钮翻页,/-或按钮缩放,Esc 返回。拖拽重排 / 旋转 / 删除:缩略图网格里拖动即重排,单击多选,对选中页 ±90° 旋转或删除(禁止删空)。提取与合并:把选中页提取为一个新 PDF 对象;或合并本地的另一个 PDF,页面追加进来。保存:覆盖原文件 / 另存为新对象 / 下载到本地。Double-click a thumbnail to read a page full-size (rendered by pdf.js at its rotation), paginate with keys or buttons, zoom with /-, Esc to return. Drag thumbnails to reorder, click to multi-select, rotate selected pages ±90° or delete them. Extract selected pages to a new PDF object, or merge in a local PDF. Save by overwriting, saving as a new object, or downloading.页码与水印 | Page Numbers Watermark加页码:六个方位(上下 × 左中右)、可设起始编号 / 字号 / 格式({n}占位,如「第 {n} 页」);自动处理页面旋转,页码始终正立。加文字水印:可调透明度(真正的 PDF 透明,通过 ExtGState)、旋转角、字号,支持平铺铺满或页面居中一处。Stamp page numbers in any of six positions with a configurable start, size and format ({n}); rotation is handled so numbers stay upright. Add a text watermark with real PDF transparency (via ExtGState), a rotation angle, size, and either a tiled fill or a single centered mark.提取文本与压缩 | Text Extraction Compression提取文本:按页抽取文字层,侧栏展示,一键复制全部或导出 txt;扫描件无文字层会明确标注。压缩瘦身:压缩未压缩的流、剪除孤儿对象、用对象流 交叉引用流打包,减小体积省云存储;显示压缩前后大小与节省比例,对已优化文件会如实提示。Pull the text layer out page by page, shown in a side panel with copy-all or export-to-txt (image-only pages are labeled as having no text). Compress by deflating streams, pruning orphan objects and packing into object / xref streams, reporting the before/after sizes and honestly noting when a file is already optimal.工程与一致性 | Engineering Consistency纯 Rust,无原生依赖:新增nebula-pdfcrate 基于 lopdf,不链接任何 native 库,CI 直接编译,Windows / macOS / Linux 表现一致。前后端分工:重活(解析 / 组装 / 叠加内容 / 压缩)在 Rust 后台线程完成,前端 pdf.js 只做渲染与交互,大文件也不阻塞界面。A newnebula-pdfcrate built on lopdf links no native libraries, compiles cleanly in CI, and behaves the same on all three platforms. Heavy work runs on a background Rust thread while pdf.js only renders, so large documents never block the UI.立即下载 | Download Now在 GitHub Releases 下载最新版本或访问官方网站了解更多信息。Download the latest version from GitHub Releases, or visit the Official Website for more information.