How to Send an Invoice PDF
The most common ways to deliver an invoice to your client.
Updated March 9, 2026 by invoice.Now.
Why PDF?
PDF is the standard format for invoices because it preserves your layout across every device and operating system. It cannot be accidentally edited by the recipient, it prints cleanly, and it is easy to archive. Most clients and accounting departments expect invoices as PDF attachments.
Method 1: Email Attachment
The most common approach. Create your invoice, export it as a PDF, and attach it to an email. This works for freelancers, small businesses, and most B2B transactions.
Subject Line Best Practices
Your subject line should be clear and scannable. Include the invoice number and your name or business name so the client can find it later.
Good subject lines:
- Invoice #MC-2026-003 from Maria Chen
- Invoice #INV-0042 - Web Design Services - March 2026
- Payment Request: Invoice #2026-0015 from Bright Studio
Avoid: "Invoice" (too vague), "URGENT - Please Pay" (unprofessional), or no subject at all.
Example Email
Subject: Invoice #MC-2026-003 from Maria Chen
Hi Sarah,
Please find attached invoice #MC-2026-003 for the website redesign project completed in March 2026.
Amount due: $3,100
Due date: April 4, 2026
Payment can be made via bank transfer using the details on the invoice. Please let me know if you have any questions.
Thank you,
Maria Chen
Tips for Email Delivery
- Name the PDF file clearly: Invoice-MC-2026-003.pdf, not "document1.pdf".
- Send to the correct contact. If your client has a dedicated billing or accounts payable email, use that.
- Include the key details (amount and due date) in the email body so the client does not have to open the attachment to know what it is about.
- Keep the email brief. The invoice itself contains all the detail.
Method 2: Cloud Sharing
Upload the PDF to a cloud storage service (Google Drive, Dropbox, OneDrive) and share the link with your client. This is useful when email attachment size limits are a concern or when you want to keep a shared folder of invoices for an ongoing project.
- Set the sharing permissions so the client can view but not edit.
- Include the sharing link in your email along with the invoice details.
- Consider also attaching the PDF directly, since some clients prefer not to click external links.
Method 3: Accounting Software or Client Portal
If you use accounting software (QuickBooks, Xero, FreshBooks, etc.), you can send invoices directly through the platform. The client receives an email with a link to view and pay the invoice online. Many of these tools also let you download the invoice as a PDF for your records.
For clients who use their own procurement systems, you may need to upload your PDF invoice to their vendor portal. Ask your client for instructions if they use this approach.
After You Send
- Save a copy. Keep a copy of every invoice you send, organized by client or date.
- Track the status. Note when you sent it and follow up if payment has not arrived by the due date.
- Follow up politely. If the due date passes, send a brief reminder referencing the invoice number and amount.
Use the invoice PDF generator to create and export your invoice, or start from scratch in the invoice editor.
Create and download your invoice PDF