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EDIT
Embed a file or a text note inside a PDF, so it travels with the document wherever it goes.
QUICK ANSWER
To attach a file to a PDF, add the PDF, choose the file to embed, such as another PDF or an image, and add a note if you like. Readers open attachments from their viewer’s attachments panel. It runs in your browser, so your files aren’t uploaded.
Updated 31 October 2026 · Written by the StackPDF teamUpdated 31 October 2026 · StackPDF team
You’ll choose the file to attach next. It stays in this browser.You’ll choose the file to attach next. It stays in this browser.
PDF files · Runs in your browser
QUICK ANSWER
To attach a file to a PDF, add the PDF, choose the file to embed, such as another PDF or an image, and add a note if you like. Readers open attachments from their viewer’s attachments panel. It runs in your browser, so your files aren’t uploaded.
Updated 31 October 2026 · Written by the StackPDF teamUpdated 31 October 2026 · StackPDF team
HOW TO
Drop it here, or choose it from your computer, your phone or My files.
Pick a PDF, PNG, JPG or TXT file, and add a note if you like.
The attachment is inside the PDF. Readers open it from the attachments panel.
GOOD TO KNOW
An attachment is a file stored inside the PDF, like an email attachment.
| USE | ATTACH | GOOD TO KNOW |
|---|---|---|
| Send supporting documents | Another PDF, such as terms and conditions | Readers open it from the PDF |
| Keep evidence together | Photos or scans | Everything stays in one file |
| Leave instructions | A text note | Shown in the attachments panel |
Attachments make the PDF bigger. Sanitize PDF removes them before you share.
PRIVACY
Yes. Attach a file to a PDF runs in your browser, so the file never leaves your device.
StackPDF opens the PDF in your browser tab and does the work there.
Close the tab and it’s gone. Free results download to your device. Premium can also keep them in My files.
pdf-lib, PDF.js and qpdf do the work, inside your browser.
FAQ
Add the PDF, choose the file to attach and download. Readers open the attachment from their viewer’s attachments panel.
Yes. The free plan includes 1 PDF export a day, with no account. Premium removes the daily limit for $5.99 a month or $39.99 a year.
No. The PDF and the file you attach are combined in your browser, so both stay on your device.
A PDF, PNG, JPG or TXT file, a note you type, or both. To attach more files, add them one at a time.
In the attachments panel of their PDF viewer, such as the paper clip in Adobe Acrobat. Some browsers’ built-in viewers don’t show attachments.
Run the PDF through Sanitize PDF, which removes attachments along with other hidden data.