Add PDF attachments

Add Attachments to a PDF

The Add Attachments to PDF tool lets you embed additional files inside a PDF document, such as supporting documents, images, or related files. It is useful when you want to keep the main document and its supporting files together in a single PDF.

How to Add Attachments to a PDF

1. Select the main PDF file from your device.
2. Choose the file or files you want to attach.
3. Review the selected attachments using the available options.
4. Start processing the document.
5. Download the new PDF and verify the attachments using a PDF viewer that supports embedded files.

Add Attachments to PDF Features

1. Embed additional files inside a PDF document.
2. Keep a main document and supporting files together.
3. Useful for reports, contracts, and document packages.
4. Create a new PDF without replacing the original file.
5. Make related documents easier to archive together.
6. Works directly in your browser without installing additional software.

PDF Attachments vs. Merging PDF Files

Use attachments when you want to keep an additional file embedded in the PDF without turning its contents into document pages.

If you want the pages of multiple PDFs to become part of one document, use Merge PDF.

If you need to retrieve embedded files from an existing PDF, use Extract PDF Attachments.

Frequently Asked Questions About PDF Attachments

What are PDF attachments?

They are files embedded inside a PDF document that can be accessed with a PDF viewer that supports file attachments.

Do attached files become pages in the PDF?

No. An attachment remains a separate embedded file and is not automatically converted into document pages.

Can I add more than one attachment?

That depends on the current tool options. If the attachment field supports multiple files, they can be added in the same operation.

Do all PDF viewers show attachments?

Not necessarily. Some basic viewers may not display attachments clearly, so use a PDF viewer that supports embedded files to verify the result.

Is the original PDF changed?

No. A new PDF containing the attachments is created, while the original file remains unchanged on your device.

Can I extract the attachments later?

Yes. You can use Extract PDF Attachments to retrieve embedded files when they are available.

Does adding attachments increase the PDF file size?

Yes. The output file will usually be larger because the attached files become part of the PDF package.

Do I need to install additional software?

No. The tool works directly in your web browser.