Guide
Mail a letter online
Mail a letter online by uploading a PDF, adding sender and recipient addresses, and choosing USPS delivery options. PostalForm prints and mails the letter for you.
Published Jan 11, 2026 • Updated Jan 21, 2026
How it works
Upload your PDF
Drag and drop your document or upload from phone.
Add addresses
Enter sender and recipient addresses with validation.
Checkout
We print and mail it via USPS with your chosen options.
Key takeaways
- Upload a PDF and PostalForm handles printing and USPS mailing.
- Choose First Class (3–7 days) or Express (1–3 days), and add Certified Mail for proof.
- Combine multi-page packets into one PDF and mail early if you have a deadline.
When physical mail still matters
In a world of email and portals, physical mail exists for situations where digital won't work:
Legal notices — Courts, agencies, and contracts often require mailed notice. "I emailed them" doesn't satisfy a requirement that says "written notice by mail."
Proof of delivery — When you need to prove you sent something, Certified Mail creates a paper trail with signatures. Certified Mail with Electronic Return Receipt
Recipient requirements — Some people and institutions only accept physical mail. Insurance companies, government agencies, older landlords, certain courts.
Deadlines — When instructions say "must be postmarked by [date]," USPS postmark is what counts.
If the recipient accepts email or portal uploads, use those. If they require physical mail, keep reading.
What you need to mail a letter online
- A PDF of your letter — Export from Word, Google Docs, or scan a signed document. Up to 100 MB and 199 pages.
- Recipient's mailing address — Use exactly what's on any notice or instructions you received.
- Return address — So undeliverable mail comes back to you.
That's it. No printer, envelopes, stamps, or trip to the post office.
How PostalForm works
- Upload your PDF — From phone or computer. We show you a preview.
- Enter addresses — Autocomplete helps, and we validate before printing.
- Choose delivery options — First Class (3–7 days) or Express (1–3 days), plus Certified Mail if you need proof.
- Checkout — We print, stuff the envelope, add postage, and hand it to USPS.
Delivery options explained
USPS First Class Mail (3–7 business days)
The standard option for most letters. Reliable, affordable, and appropriate for anything that isn't time-critical.
USPS Priority Mail Express (1–3 business days)
When timing matters. Faster transit, but costs more. Use this when you're up against a deadline.
Certified Mail with Electronic Return Receipt
Available with First Class only. Adds USPS tracking and requires a signature on delivery. You get a digital record showing who signed and when. Learn more about Certified Mail
Understanding delivery timing
Processing time — We typically print and mail within 1 business day of checkout.
USPS transit time — First Class is 3–7 business days, Express is 1–3 business days. These are estimates; actual delivery depends on distance and USPS workload.
Postmark date — The postmark is when USPS accepts the letter, not when you check out. If you have a deadline, mail early.
If your letter has a deadline
When instructions say "must be received by" or "must be postmarked by" a certain date:
- Postmarked by — Mail early enough that USPS postmarks it before the deadline. Processing + handoff to USPS can take 1 business day.
- Received by — Count backwards from the deadline. If it's 7 days away and you're using First Class, you're cutting it close.
When in doubt, use Express and mail several days early.
Mailing packets with multiple pages
If you're sending a letter with attachments (forms, supporting documents, proof), combine everything into one PDF before uploading. We print pages in order.
Suggested order for packets:
- Cover letter or cover note (optional but helpful)
- Main document or form
- Attachments and supporting pages
Cover note template:
Date: January 19, 2026
To: [Recipient / Department]
Re: [Subject / Account / Claim Number]
Enclosed:
- [Document 1]
- [Document 2]
Contact: [Your name, phone, email]
A cover note tells the recipient what they're looking at and how to reach you if there's a problem.
When to use Certified Mail
Add Certified Mail when:
- The recipient requires proof of delivery
- You're sending a legal notice or demand letter
- You want documentation in case there's a dispute later
- Instructions specifically require certified delivery
Don't need proof? Standard First Class is fine.
What PostalForm can't do
- Physical enclosures — We can't mail checks, IDs, keys, or anything that isn't printed on paper.
- International mail — Currently U.S. addresses only.
- Same-day delivery — We're not a courier service. Fastest option is USPS Express (1–3 days after we mail it).
If you need to include physical items, you'll need to mail it yourself or use a courier.
Return address tips
Use a return address where you can actually receive mail. If a letter is undeliverable, USPS returns it to the sender address.
If you're traveling or don't have stable housing, consider using a family member's address or a mail forwarding service.
Include apartment, unit, or suite numbers exactly as written.
Creating a PDF
From a document:
- Word: File → Save As → PDF
- Google Docs: File → Download → PDF
- Pages: File → Export to → PDF
From a signed paper document:
- iPhone: Use the Notes app or Files app to scan
- Android: Use Google Drive's scan feature
- Any phone: Take a photo in good light, convert to PDF
For multi-page documents, scan all pages into a single PDF. Most scanning apps let you add pages before exporting.
Common mistakes
Wrong address format — Use the exact address from any notice you received. Don't abbreviate or rearrange.
Missing reference numbers — If instructions mention an account number, claim number, or case number, include it.
Multiple files instead of one PDF — Combine everything into one PDF. We print what you upload.
Waiting until the deadline — Mail early. USPS transit times are estimates, not guarantees.
Sources
Pricing is straightforward:
Postage is included. Large packets (many pages) may add a processing fee. Certified Mail and Express delivery are priced at checkout.
Why PostalForm
USPS delivery
First Class or Express with optional Certified Mail.
Address validation
Reduce returned mail and delivery errors.
Fast checkout
Upload once and mail in minutes.
Ready to send it?
Upload your PDF and we'll handle printing and USPS delivery.