Add Attachments
Embed files as attachments within PDF documents.
Drag & drop files here, or click to select
Supports PDF, images, docs, and more
Use cases:
- Attach source files to reports
- Include related documents
- Combine multiple files into one container
- Archive project deliverables
Note: Attachments increase file size. Ensure the PDF reader supports viewing attachments (e.g., Adobe Acrobat).
How to Embed Attachments in PDF Files Online
Select the target PDF file from your device.
Click the file upload area under Attachments to choose files to embed.
Add optional descriptions for each of your attachments.
Click the Add Attachments button to process and save the file container.
Why Use SonuPDF to Attach Files to PDFs?
In-Browser Embedding
Files are attached locally in your web browser. In contrast to other services, your documents never upload to a cloud server, ensuring full data privacy.
Universal Format Support
Attach spreadsheet files, images, documents, slides, or archives directly inside your PDF container.
Attachment Metadata
Add descriptions and names to each embedded attachment so readers can easily locate and understand them.
No Storage Restrictions
Process large documents and multiple attachments directly in local browser memory without cloud limitations.
Frequently Asked Questions
Yes. The embedding process is executed entirely inside your browser's local sandbox. No data is sent to external servers.
Yes, you can attach any file format, including spreadsheets, slides, images, archives, and text files.
Most standard PDF viewers, including Adobe Acrobat, Foxit Reader, and modern web browsers, support navigating and downloading embedded files.
The final PDF size will increase by the size of the attached files. There are no size limits other than your local device's memory.