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# Attach files to a document

Last checked 2026-11-12

You can attach files to a document you make on to.co while it is a draft: a timesheet to an invoice, a drawing to a request for quote, a photo to one line of an order. They go with the document when you send it.

## What you can attach

- PDF files
- Pictures: PNG and JPEG
- Word documents (.docx)
- Excel workbooks (.xlsx)

Each file can be up to 10 MB, and a document can carry up to 10 files. to.co looks at what is inside a file, not its name, so a file renamed to look like a PDF is refused.

Word and Excel files are refused when they contain macros, embedded objects or links that load something from the internet when the file is opened. Older formats (.doc, .xls) and macro-enabled ones (.docm, .xlsm) are not accepted. Save the file as .docx or .xlsx without macros and attach it again.

## Attach a file

1. Open the draft in **Documents**, or edit it.
2. Under **Attachments**, choose what to attach it to: **The whole document**, or one of its lines.
3. Choose the file, then **Attach file**.

A new document has to be saved as a draft before you can attach files to it.

## Checking for viruses

Each file shows **Checking for viruses** until it has been checked. This usually takes a few seconds. Then it shows **Ready**, or **Refused** with the reason.

A PDF or picture is also rebuilt into a clean copy, keeping only its pages or pixels. This is the copy that is sent and downloaded. A Word or Excel file that passes its checks is sent as it is.

No virus check finds everything. A file marked Ready has passed our checks; it is not a guarantee.

You cannot issue a document while a file is still being checked, or while a refused file is still attached. Remove a refused file, then issue the document.

## When you send it

When you issue the document, the name, size and fingerprint of each file become part of the signed document. The business you send it to sees exactly those files, and can tell if one was changed.

Files can only be added or removed while the document is a draft. Once it is issued, they stay as they are.

## Downloading files

On any document, its files are in the **Download** menu at the top right, under the PDF. Files attached to a line are on that line: the button downloads the first file, and the arrow next to it lists them all.

## With Xero

If you use [Xero with to.co](https://to.co/en-ie/help/xero):

- A quote, invoice or credit note that to.co sends for you from Xero carries Xero's PDF of it, and the files attached to it in Xero. They are checked the same way first, so it is sent a few minutes later.
- When to.co adds a document to your Xero (a bill, a draft quote or a draft purchase order), the files attached to it on to.co go with it, after its PDF. A file on a line is named after its line, because Xero keeps files on the whole record.