Prepare complex communications with confidence

Build, review, and deliver accurate, personalized communications across email and mail using data from multiple systems.

Merge Group Attach Validate Deliver

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Merge

Stop YouTubing your way through Excel.

Merge up to five Excel or CSV files, even when the data doesn’t line up perfectly.

Merge up to five files

Combine Excel and CSV files without complex formulas or pulling in an analyst.

Connect each recipient across files

Connect data for the same recipient, even when each system organizes it differently.

See what matched and what didn’t

See who matched across files, find who didn’t, and choose what to include before merging.

Keep the finished file

Download the combined Excel file for free, along with a summary of what matched and what needs attention.

Your data never leaves.

Letterbatch processes your files in your browser. We never upload, store, or see your data.

Never uploadedNever stored

How we protect your data

Group

One list. A different message for every group.

Use any detail in your data to create communication groups, preview who is included, and choose what each group receives.

Use state, role, specialty, performance, or any other column in your list.

Combine conditions when the right group depends on more than one detail.

See the recipient count and real rows before you create anything.

Prepare email drafts, a print-ready mail package, both, or just the personalized documents.

Attach

Attachment anxiety, handled.

Split, match, and personalize complex attachments without opening, renaming, or rebuilding files one by one.

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Validate

Find it. Fix it. Prove it.

Letterbatch flags potential issues from upload to download, gives you ways to resolve them, and records what happened.

See validation in action

Find what needs attention

Check uploads, matched records, merge fields, email addresses, mailing addresses, and finished communications.

Fix it your way

Correct one value, apply a rule, upload changes, or decide the original data should stay.

Prove what happened

Preview real recipients and download a receipt showing the outcome for every person.

Export

Create once. Export everywhere.

Export Outlook-ready drafts, Power Automate data, print-ready mail packages, and finished files for your records.

See outputs in action

Export complete Outlook drafts or JSON files for Power Automate.

Create print-ready packages for you or your print vendor.

Download each recipient’s finished files for storage, audits, or another system.

Complex communications.One controlled workflow.

Merge files, organize recipients, personalize documents, validate the details, and export every version from one workflow.

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