Are files uploaded to a server?

No. PDFs are read and merged entirely inside your browser using WebAssembly-capable APIs.

Why did a file fail to load?

Password-protected or corrupted PDFs may be rejected by the parser. Try unlocking or re-exporting the file first.

Very large files are limited by your browser memory. For huge archives, split work into smaller batches.

在浏览器中将多个 PDF 合并为一个文件，可调整顺序后下载 merged.pdf。

添加 PDF

请添加两个或以上 PDF 文件。

使用 pdf-lib 在本地解析每个 PDF，按顺序复制页面并生成新文件。加密 PDF 需先在其它工具中解锁。

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客户端合并的原理与适用场景。