A professional invoice is one an accounts payable clerk can process without emailing you back. Navy header band, your legal name and the client's AP contact, a PO number field, Net 30 terms, and remittance instructions in the notes.
Free, fillable, US Letter, no email, no sign-up. The Avo app for iPhone makes invoices in its own layout and adds up the totals; this PDF is for the professional look.

The filled sample. Names, addresses and amounts are made up; the blank PDF you download has the same fields empty.
The navy band holds the word INVOICE and your business block in white. Below it, a light grey row carries the meta fields. The item table has a tinted header and alternating rules, and the total due is boxed in navy at the right so it is found in a stack of paper.
Day rates, fixed deliverables, training sessions and travel on separate lines, PO number in the header.
Everything procurement asks for is already on the page: legal entity, PO, terms, remit-to.
The same band and table carry labour and materials for a commercial client just as well.
Legal business name and contact in the band. Client block with an attention line for accounts payable. Invoice number, date, due date, terms and PO number. Four item lines with quantity, rate and amount. Subtotal, tax, total due. Notes for remittance details.
The sample is a consulting firm invoicing a dental group: three on-site review days, a documentation deliverable, two training sessions and travel, on Net 30 with the client's PO number referenced. No tax applies to the service in this example.
| Description | Qty × rate | Amount |
|---|---|---|
| Operations review, on-site | 3 days × $1,600.00 | $4,800.00 |
| Workflow documentation | 1 × $2,200.00 | $2,200.00 |
| Staff training session | 2 × $750.00 | $1,500.00 |
| Travel (mileage and parking) | 1 × $164.00 | $164.00 |
| Subtotal | $8,664.00 | |
| Total due | $8,664.00 | |
Avo keeps your clients and your usual line items, so the next invoice is three taps. Your first three documents are free, full-quality PDF, no watermark. Premium from $59.99/year if you invoice often.

Scan the code with your iPhone camera to open Avo in the App Store, or email yourself the link.
Legal name that matches your W-9, their PO number, a unique invoice number, clear due date, and remit-to instructions. Missing any one of them is the usual reason payment stalls.
Match the client's payment run. Large companies pay on Net 30 cycles whatever you write; small clients pay faster when the due date is 7 to 14 days out. The guide on payment terms covers wording.
The PDF has no image field. Place it with Acrobat or a PDF editor on the right side of the band, or use the Word version of the standard template.
The estimate templates on this site share the same field set, with a valid-until date and an acceptance line. Numbers carry over when the client approves.
ModernCharcoal type, one blue stripe, the total in a blue block
RedBrick-red band, classic trade grid
MinimalistHairline rules, small caps, monospaced numbers
LuxuryBlack band, gold frame, serif title