How to add and remove file attachments in a PDF
To attach a file to a PDF, open PDF Attachments, drop the PDF in, and click Add a file to embed anything from your device — a spreadsheet, an image, even another PDF. Download the new copy and the file rides inside it.
A PDF can carry whole other files tucked inside it — a spreadsheet behind an invoice, the data behind a chart, another PDF entirely — and they travel with the document without showing up on any page. To put one in, or take one out, open PDF Attachments, drop in your PDF, and use Add a file or Remove. Everything happens in your browser, and the change lands in a copy you download.
How do I add a file to an existing PDF?
Open PDF Attachments
Go to PDF Attachments and drop in your PDF. It lists every file already embedded — most PDFs show none — and nothing is uploaded; the reading happens in your browser.
Add a file
Click Add a file and pick anything from your device. It is embedded into the document straight away and appears in the list with its name and size.
Remove one if you need to
To take an embedded file out, click Remove next to it. That deletes the file's data from the document, not just its name from the list.
Download the copy
Click Download PDF. The attachment rides inside the downloaded file; your original on disk stays untouched.
Can I attach one PDF inside another PDF?
Yes. Any file type can be embedded — a spreadsheet, an image, a zip, or another PDF entirely. It rides inside the document as a separate file and opens in readers that support attachments, such as Adobe Acrobat, without changing any of the pages you see. The pages, text and layout of the host PDF are left exactly as they were.
How do I remove a file attached to a PDF?
Open the PDF in PDF Attachments and click Remove next to the file. The tool deletes the embedded file's data stream from the document, not just the pointer to it, so the bytes genuinely leave the copy you download rather than sitting there unlisted.
That distinction is the whole point, because people remove an attachment precisely when it is sensitive. A tool that only unhooked the reference would report success while the file still shipped inside the PDF, openable by anyone who went looking. You can check the removal worked: the downloaded file gets smaller by roughly the size of what you took out, and the file's name no longer appears anywhere in its raw bytes.
Will merging or splitting the PDF keep the attachment?
No. Attachments live at the document level, so the copy-based tools that rebuild a PDF from its pages — merge, split, delete, extract, organize — leave them behind, along with bookmarks and the document title. Add your attachments last, after any page work is done, or the rebuild will quietly drop them.
Are my files uploaded when I attach them?
No. PDF Attachments reads and rewrites the file in your browser and sends nothing anywhere. That matters more here than usual: the attachment is often the sensitive part, and checking a document for hidden files is the last thing you would want to do by uploading it to a stranger's server.
Two limits worth knowing before you rely on it. When you add a file, the tool takes its name and type straight from what you picked — there is no field to type a custom label or description, so the description column only shows notes that were already written into the file. And an embedded file is only visible in a reader that supports attachments; a basic viewer shows the pages and quietly ignores the attachment, which is exactly why it is worth listing them before you forward a document you did not make.
- PDF Attachments embeds any file — spreadsheet, image, zip, another PDF — inside your document, and lists what is already in there with each file's size.
- Removing an attachment deletes its data from the file, not just the reference, so a sensitive file is genuinely gone from the copy you download.
- Attachments live at the document level, so merge, split and the other page-rebuilding tools drop them — add attachments last.
- Everything runs in your browser; the document and its attachments are never uploaded.
