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USPS First-Class Mail Guide (2026)

Navigate current USPS postage rates, delivery speeds, and mailing rules for First-Class letters—or skip the post office entirely.

Need to send a First-Class letter right now? Upload a PDF and Postmarkr prints, stamps, and mails it for $2.05.

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ARTICLES

Illustration of a phone scanning a paper page, the scan becoming a clean PDF, and the PDF becoming a printed letter in the mail.

USPS ·

How to Send a Letter From Your Phone (iPhone and Android)

Scan a paper document to PDF on iPhone or Android, then upload it from your phone and have it printed and mailed First-Class.

Side-by-side comparison of USPS First-Class Mail and Priority Mail across what each is built for, delivery speed, tracking, and included insurance.

FIRST-CLASS MAIL ·

First-Class vs Priority Mail: Key Differences

First-Class Mail is the cheap everyday option for letters and documents; Priority Mail is the faster, tracked service for packages. Here's how they compare and when to use each.

Paper envelopes branch toward three miniature neighborhoods, with a red envelope at the junction.

FIRST-CLASS MAIL ·

Bulk Mail Postage Rates 2026: USPS Costs & Minimums

Bulk postage depends on what you send, how your addresses are grouped, and where the prepared mailing enters USPS. Check the postage line on your quote, then budget separately for printing and preparation.

Loose envelopes, a red three-slot sorter and neatly banded letter stacks on a navy surface.

FIRST-CLASS MAIL ·

Commercial First-Class Mail Rates: Presort Costs and Eligibility

First-Class Presort can reduce postage on a qualifying mailing. Compare current letter rates, preparation requirements and applicable fees before deciding whether the complete mailing costs less.

A narrow cream envelope overlaps a larger navy document envelope beside red measurement brackets and a ruler.

FIRST-CLASS MAIL ·

First-Class Mail Sizes: Letters, Flats and Postage

A document envelope's size, weight and flexibility determine its postage category. Compare letters and large envelopes, check surcharge triggers, and choose the right rate.

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