Send letters from your daily workflow.

Easily enhance your workflows and send letters directly from the software solutions you already use. Automate your letter sending via Royal Mail without leaving your platform.

Get started — it's free Open API documentation

Ready-to-use integrations

Connect the tools you already rely on

Email-to-letter

Add postal delivery to any email tool by simply sending your PDFs to a LetterAPI email address.Learn more

S3

Leverage S3 to reliably send large-volume mailings straight from your digital workflows.Learn more

OneDrive

Send documents from Word and other Microsoft products with a few clicks, saving time and effort.Learn more

Dropbox

Link your Dropbox account to LetterAPI for letter sending straight from your cloud-based system.Learn more

Google Drive

Easily upload and send PDFs from Google Drive including Docs and Sheets, for a smooth experience.Learn more

SFTP Share

Connect your SFTP server to LetterAPI for secure bulk uploads, great for existing SFTP workflows.Learn more

Zapier integrations

7,000+

Thanks to the Zapier–LetterAPI integration, you can easily send postal letters directly from over 7,000 apps with just a few clicks.

Explore Zapier integrations

Build your own integration

Add mailing capabilities via Royal Mail to any software with LetterAPI's scalable API — simple to integrate and ready to grow with your needs.

Open API documentation

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Use cases

Discover various industries and scenarios where LetterAPI is successfully used.

Pricing

Easily calculate your mailing costs using our intuitive and user-friendly calculator.

Documentation

Benefit from advanced features for an efficient mailing process.

Level up your workflow with LetterAPI

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