What file types can I attach?

Any type — spreadsheets, images, archives, source files. The PDF stores the raw bytes plus the filename, so the recipient gets the file back exactly as you attached it.

How many files can I embed?

Up to 50 attachments, with a 500 MB total ceiling including the PDF itself. Most readers handle far more, but beyond that the file becomes unwieldy to share.

How does the recipient get the files out?

Every mainstream PDF reader has an attachments panel — in Acrobat it's the paperclip icon, in browsers it's usually under a sidebar or menu. The files extract unchanged.

Can I rename or delete attachments already in the PDF?

Yes — the Manage tab lists every embedded file with its size. Rename entries inline or mark them for deletion; nothing is written until you press Save.

Does it work on password-protected PDFs?

Yes, after unlocking. Attachments are listed normally, but saving an encrypted file rebuilds it from page images — attachments survive, selectable text does not. Unlock the file first if you need the text layer.

Are attachments the same as annotations?

Both are supported. Document-level attachments live in the file's name tree; file-attachment annotations are pinned to a page. The tool lists both and labels annotation-sourced files with their page.

Are my files uploaded to a server?

No. The PDF and everything you attach are processed entirely in your browser. Nothing leaves your device.

PDF添付ファイル：PDF内のファイルを埋め込み・編集・抽出

任意のファイルをPDFに添付し、埋め込み添付ファイルの名前変更や削除、デバイスへの抽出ができます。無料・プライベート、すべてブラウザー内で処理されます。

1. Open a PDF

Drop in the PDF that should carry the files. It is read locally and never uploaded.

2. Add, manage or extract

Attach up to 50 files, rename or remove existing attachments, or download embedded files — individually or as a ZIP.

3. Save the PDF

Download a PDF with the attachments embedded — any reader can extract them.

About PDF Attachments

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.

Add

Attach up to 50 files of any type — spreadsheets, images, source files — up to 500 MB total. They embed at document level, visible to every reader.

Manage

See every embedded file with its size, rename entries for clarity, and mark attachments for removal. Nothing is written until you save.

Extract

Download any embedded file individually, or pull everything out at once as a ZIP archive.

Fully Local

The PDF and its attachments are read and rewritten in your browser. Nothing is uploaded — closing the tab wipes the data.

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.

機能	OxygenPDF	Zip alongside the PDF	Cloud link in the document
Files travel inside the document
Works offline for the recipient
Rename / remove embedded files
No upload, runs locally