Are my PDFs uploaded anywhere?

No. Two JavaScript libraries do the work inside your browser: PDF.js draws the page previews, and pdf-lib assembles the finished document. Both are served from this site, so your files are read from disk into browser memory and written back out as a download. You can verify it by disconnecting from the internet after the page loads — the tool still works.

Can I reorder pages from different PDFs together?

Yes, that is the point of the page grid. Once your files are loaded, every page is an independent thumbnail regardless of which document it came from, so you can interleave chapters, move a signature page to the end, or pull one page from each of five files into a new order.

How do I delete or rotate a single page?

Hover a page thumbnail (or just tap it on a phone) to reveal its controls. The rotate button turns that page 90° clockwise each press, duplicate inserts a copy directly after it, and the bin removes it. Nothing is applied to your original file — the changes are written only into the new PDF you export.

Why do some pages show "Preview unavailable"?

The preview and the export are separate steps. A page can fail to draw — an unusual font, a damaged object, an image format your browser cannot decode — and still copy into the finished PDF perfectly well, because pdf-lib moves the page data across without re-rendering it. The thumbnail is only a picture of the page, not the page itself.

How many pages can it handle?

There is no fixed limit. Previews are drawn only as you scroll to them, so a long document stays responsive, but every source file is held in memory while you work. A few hundred pages is comfortable on a desktop; a phone has far less headroom and may struggle with very large scanned documents.

Is there a limit on file size or number of documents?

We impose none. The practical limit is your device memory, because every document must be held in RAM while merging. Merging a few hundred megabytes is fine on a desktop; mobile devices have less headroom.

Can I merge a password-protected PDF?

Encrypted PDFs cannot be read without the password, so they must be unlocked first. If you can open the document in your PDF reader, print it to a new PDF and merge that copy instead.

Will merging reduce the quality of my document?

No. Pages are copied at full fidelity, preserving the original text, vector graphics and embedded images. Nothing is rasterised or re-compressed, so the output is visually identical to the inputs.

Are bookmarks, form fields and annotations preserved?

Page content, images and most annotations carry over. Document-level structures such as outlines and interactive form fields may be dropped or flattened, which is a known limitation of page-level copying.

Can I merge files in a specific order?

Yes. After adding your files, use the move up and move down controls on each row. The final PDF follows the list order exactly, top to bottom.

Yes. There is no account, no trial, no watermark and no paid tier gating the output. Because processing happens on your device, serving the tool costs us almost nothing.

PDF 文件合并与页面整理

合并 PDF 文档、调整页面顺序、旋转方向或删除冗余页面。

拖放 PDF 文件至此处

添加 2 个或更多文件以合并，或添加 1 个文件以整理页面顺序。

无文件大小限制 · 无需注册 · 页面加载后支持离线使用

将多个 PDF 合并为一个文件，通过拖放操作随心调整页面先后顺序，旋转颠倒的页面并删除不需要的空白页。全过程在浏览器内完成。

PDF 合并工具使用教程

Four steps, no account, nothing uploaded.

添加 PDF 文件

将 PDF 文件拖入工作区，或通过文件选择器从电脑中选取。
整理页面顺序

按住并拖动页面缩略图，将各页面排列到您期望的顺序。
旋转或删除页面

将鼠标悬停在页面上，点击旋转 90 度或点击垃圾桶图标删除。
一键合并导出

自定义导出文件名，点击“合并并下载 PDF”即可保存。

核心特色

Built so your files never have to trust a server.

文档隐私万无一失

商业合同、发票和个人凭证均在本地处理，任何数据绝不流向互联网。

直观页面缩略图

每一页都以交互式缩略图卡片呈现，方便直观查看与核对。

简易拖拽排序

只需按住鼠标拖动，即可跨文件自由调换页面的先后顺序。

旋转与单页删除

一键将页面旋转 90° 调整至正确方向，或在合并前剔除无用的空白页。

常见问题解答 (FAQ)

Everything people ask about the PDF Merger.

我的 PDF 会被上传到服务器吗？

不会。所有解析与合并处理均借助 WebAssembly 和 pdf-lib 库在您的浏览器中 100% 本地完成。

有文件大小或页面数量限制吗？

没有任何人为设定的限制。唯一的上限取决于您设备可用的 RAM 内存。

可以用来重新排列单个 PDF 的页面吗？

可以。添加 1 个 PDF 文件，调整、旋转或删除页面后，下载生成的新文件即可。

文档内的超链接和表单内容会保留吗？

大部分标准超链接和表单元素在页面合并后都会完好保留。

如何旋转单张页面？

将鼠标悬停在该页面的缩略图上，点击旋转图标即可将其顺时针旋转 90 度。

可以剔除不需要的页面吗？

可以，在合并前点击对应页面缩略图上的垃圾桶图标即可移除。

没有网络时能正常使用吗？

可以，只要页面完成初次加载，您就可以在完全断网的离线状态下合并 PDF。

可以为合并后的文件重命名吗？

可以，在导出前于“导出文件名”输入框中输入您喜欢的名称即可。

合并会导致文字或图片的清晰度下降吗？

不会，原始内容直接流式拼接合并，不会进行破坏性的二次重压缩。

可以复制某一页吗？

可以，将同一个 PDF 文件添加两次并选取相应页面即可实现。

支持带密码保护的 PDF 文件吗？

受密码保护的文件需先解密去除密码，浏览器才能读取并解析其页面结构。

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核心特色

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整理页面顺序

旋转或删除页面

一键合并导出

核心特色

文档隐私万无一失

直观页面缩略图

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