--- title: PostalForm mailing resources description: Find the best path for mailing a letter, PDF, form, notice, or document packet online. These guides explain preparation, pricing, delivery options, proof, and automation without requiring a printer or post office trip. seotitle: PostalForm Mailing Resources, Guides, and Tools seo-description: Practical guides and tools for mailing letters, PDFs, Certified Mail, forms, business notices, international mail, and developer workflows. group: resources indexable: true nav: true nav-order: 7 schema: webpage eyebrow: Resources published: 2026-04-27 updated: 2026-09-24 path: /resources --- # PostalForm mailing resources Find the best path for mailing a letter, PDF, form, notice, or document packet online. These guides explain preparation, pricing, delivery options, proof, and automation without requiring a printer or post office trip. ## Start here | What you need to do | Best starting point | What it covers | | ------------------------------- | --------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------- | | Write or upload a letter | [Send a letter online](/send-letter-online) | Create or upload the document, confirm the addresses, preview the mailing, and see the price before checkout. | | Mail a finished document | [Mail a PDF online](/mail-pdf-online) | Upload and preview a PDF, including multi-page document packets. | | Get USPS proof | [Send Certified Mail online](/certified-mail-online) | Certified Mail tracking, delivery events, and optional Electronic Return Receipt for qualifying U.S. letters. | | Understand the complete service | [Online print and mail service](/online-print-and-mail-service) | Printing, envelope preparation, postage, carrier handoff, pricing, and workflow choices. | ## Recently updated - [Can Certified Mail be sent to a PO Box?](/certified-mail-to-po-box) — Updated September 24, 2026. Yes. - [How long does Certified Mail take?](/how-long-does-certified-mail-take) — Updated September 24, 2026. Certified Mail is an extra service for proof and tracking; it does not create a faster mail class. - [Best online print and mail services for PDFs and letters](/best-online-print-and-mail-services) — Updated September 23, 2026. The best online print and mail service depends on what you are sending. - [Best PDF mailing services: 11 options compared](/best-way-to-mail-a-pdf-online) — Updated September 23, 2026. The best way to mail a PDF online is to use a service that lets you upload the finished file, inspect the printable preview, enter sender and recipient addresses, choose valid mailing options, and… - [Can you send a letter online for free?](/send-a-letter-online-free) — Updated September 23, 2026. Short answer: you can send a letter online for free only if "letter" can mean email. - [Certified Mail cost in 2026](/certified-mail-cost-breakdown) — Updated September 23, 2026. Certified Mail cost is the postage for your mailpiece plus the USPS Certified Mail extra-service fee. ## Practical mailing guides - [Best way to mail a PDF online](/best-way-to-mail-a-pdf-online) — Compare the choices that matter when a finished document needs to become physical mail. - [Certified Mail online services and alternatives](/certified-mail-online-alternatives) — Choose between a managed print-and-mail service, an office workflow, and a Certified Mail label tool. - [How to mail a letter from your phone](/mail-a-letter-from-your-phone) — Prepare, review, and send a letter without a computer, printer, envelopes, or stamps. ## Certified Mail and delivery proof - [How long Certified Mail takes](/how-long-does-certified-mail-take) — Separate production time, USPS transit estimates, delivery attempts, and Return Receipt timing. - [Certified Mail cost breakdown](/certified-mail-cost-breakdown) — Understand postage, USPS extra-service fees, and the price of an online fulfillment service. - [Certified Mail Return Receipt](/certified-mail-return-receipt) — Decide when a signature record is useful and how electronic and hard-copy receipts differ. - [Certified Mail vs. Registered Mail](/certified-vs-registered-mail) — Compare proof, handling, insurance, and the jobs each USPS service is designed for. ## Business, legal, and contractor mail - [Demand letter resources](/demand-letters) — Payment demands, final notices, contractor claims, and guided letter workflows. - [Turn an unpaid invoice into a Certified Mail demand](/invoice-to-certified-demand) — Build a documented payment-demand packet from an invoice. - [Mail an invoice online](/mail-invoice-online) — Send a finished invoice or statement without handling printing and envelopes in-house. - [Landlord notice workflows](/landlord-notices) — Prepare and mail common property-management notices and packets. - [Bulk mail](/bulk-mail) — Personalize and send one document to many recipients from a CSV. PostalForm provides document and mailing tools, not legal advice. Confirm the recipient, deadline, required delivery method, and governing rules for any legal or official notice. ## Forms, disputes, and official mail - [Guided forms catalog](/forms) — Complete, preview, and mail supported government, dispute, tax, and notice workflows. - [Dispute mail](/dispute-mail) — Credit-report, billing, debt-validation, and written dispute resources. - [Tax forms and letters](/tax) — Mailing workflows for supported IRS forms, elections, and responses. - [Court forms and filings](/court) — Prepare printable packets and follow the receiving court's filing instructions. - [Consumer complaint and credit-report guides](/consumer) — Written requests, disputes, and documentation-oriented workflows. ## Developers and automation - [PostalForm Projects](/developer-mail-api) — Add letters and postcards to an application with test and live API keys, final-price quotes, idempotent sends, tracking, and signed webhooks. - [Hosted checkout and MCP mail flows](/mail-letters-with-api) — Create reviewable drafts and return checkout URLs when a person should approve and pay. - [Send physical mail from an AI agent](/send-physical-mail-from-ai-agent) — Choose a safe human-review or explicitly authorized machine-payment path. - [Developer documentation](/developers) — Review the available REST, MCP, agent, discovery, and payment surfaces. PostalForm Projects can also be provisioned through Stripe Projects with a single command. ## International mailing [See supported countries and local mailing options](/international-mail) for letters sent to the United States, Canada, Austria, Belgium, Switzerland, Germany, Spain, France, the United Kingdom, India, Luxembourg, and the Netherlands. Available tracking, signature, registered, and expedited options vary by destination. ## Free tools and planning - [Mailing price calculator](/pricing-calculator) — Estimate fulfillment cost by page count, print settings, destination, and delivery options. - [Free PDF editor](/free-pdf-editor) — Add text, signatures, images, or corrections before downloading or mailing a document. - [Merge PDFs](/merge-pdfs) — Put a letter, form, and exhibits into one ordered packet. - [Split a PDF](/split-pdf-online) — Extract the pages you need before sending. - [Delivery times](/delivery-times) — Review production and carrier estimates before choosing a service level. ## Research and service comparisons - [PostalForm online mailing data: H1 2026 order patterns](/postalform-online-mailing-data-2026-h1) — Aggregate, privacy-preserving patterns from paid PostalForm orders. - [Best online print-and-mail services](/best-online-print-and-mail-services) — Compare providers by workflow rather than treating every service as interchangeable. - [PostalForm alternatives](/postalform-alternatives) — Decide which type of mailing product best fits a one-off sender, team, or developer. - [Mailform alternative](/mailform-alternative) — Compare browser-based document mailing workflows. - [Click2Mail alternatives](/click2mail-alternatives) and [LetterStream alternatives](/letterstream-alternatives) — Compare consumer-friendly and business-mail options. ## Complete directory This page is intentionally curated. For the complete machine-readable list of public articles and mailing guides, use the [PostalForm article index](/articles.md). ## Ready to send it? Upload your file, confirm the recipient and options, preview the mailing, and see the total before payment. [Upload a document](/)