PDF 附件：在 PDF 中嵌入、編輯及擷取檔案

A PDF That Carries Its Own Files

A PDF can hold more than pages. The format has a built-in attachments mechanism — an embedded-files name tree — that lets a document carry spreadsheets, source data, images, or any other file inside itself. Recipients open the attachment panel in any PDF reader and pull the files out, no extra tooling needed.

This tool covers the whole lifecycle in one place: attach new files, rename or remove what's already embedded, and extract attachments back to your device. It reads both document-level attachments and file-attachment annotations pinned to a page.

Three Tabs, One Job

Everything around embedded files lives behind three tabs.

When Attachments Beat a Zip

Attach files when the document and its supporting material should travel as one unit: a report with its source data, a contract with its annexes, a project package with assets. Unlike a zip, the bundle opens in any PDF reader and the attachments are one click away from the pages that reference them.

Two honest limits: encrypted PDFs can be read and their attachments listed, but saving rebuilds the file from page images — the text layer is lost, so unlock the file first if text matters. And while any reader can extract attachments, not every mobile viewer surfaces the attachment panel prominently.

How It Compares

Embedding files in the PDF versus the usual workarounds.