Question 1

How do I merge multiple Excel or CSV lead lists into one?

Accepted Answer

Upload all your files to DataDesk’s List Builder — columns with the same name (Email, Title, Industry…) are matched automatically, even when the capitalisation differs. You get one master list you can filter, de-duplicate and export in seconds.

Question 2

How does DataDesk validate email addresses?

Accepted Answer

Every address passes up to ten checks: syntax, duplicate detection, misspelled providers (gmial.com → gmail.com, with the fix), disposable throwaway inboxes, spam traps, domain confirmation, MTA validation of the mail server, catch-all detection, an SMTP check that asks the recipient mail server whether that exact mailbox exists, and a database check against everything your team has already verified. Deliverable and shared-inbox addresses are marked safe to send; everything risky is flagged with the reason.

Question 3

Can DataDesk fix messy contact and company names?

Accepted Answer

Yes — Refine → Tidy names handles the two columns that arrive worst. Contact names get proper capitalisation (asad, ASAD and aSaD all become Asad; muhammad ali becomes Muhammad Ali), with numbers, symbols and bracketed notes removed and reversed “Last, First” entries put the right way round. Company names get their legal suffixes written correctly — inc becomes Inc., llc becomes LLC, ltd becomes Ltd., plus Gulf forms like FZE, DMCC and PJSC — while stylised names such as PwC, eBay, IBM, 3M and AT&T are left untouched. A suffix is never shortened or expanded, and you see the complete before-and-after list before anything is applied.

Question 4

Is my lead data private?

Accepted Answer

Yes. Files are processed inside your browser — your spreadsheets are never uploaded to anyone’s servers during merging, filtering and cleaning. Only what you explicitly save lands in your team’s own private workspace. Email verification sends just the addresses being checked to your own workspace server, never the rest of the sheet, and no third-party service is involved.

Question 5

How many records can DataDesk handle?

Accepted Answer

DataDesk is verified with files of 1,000,000+ records and 270 MB — parsing streams in the background and the table only draws what’s on screen, so even huge lists stay smooth.

Question 6

Does DataDesk verify whether a specific inbox exists?

Accepted Answer

Yes. The SMTP check opens a real conversation with the recipient’s mail server and asks whether that mailbox would be accepted — without ever sending a message. Where a domain is catch-all, or the provider deliberately answers the same way for every address, we say so rather than reporting false confidence.

Question 7

What file formats are supported?

Accepted Answer

Excel (.xlsx, .xls) and CSV/TSV for import. Export goes to Excel or CSV — CSV handles any size, and Excel opens both.

Question 8

Can I export a list with a million records?

Accepted Answer

Yes. Excel itself stops at 1,048,576 rows per sheet and struggles long before that, so DataDesk splits large exports into numbered files of 250,000 records — a million-record list downloads as four files. Each one is built and saved before the next begins, so your browser never has to hold the whole export at once. CSV handles any size as a single file and opens straight into Excel, with accented and Arabic names intact.

Question 9

What if I clean something up by mistake?

Accepted Answer

Every clean-up is reversible. Undo (⌘Z, or the Undo button) restores merged labels, combined columns, removed columns and removed files exactly as they were, so you can experiment without worrying about your data.

Question 10

Do I lose my work if I close the browser?

Accepted Answer

No. DataDesk saves your session as you go — your files, filters, clean-ups and validation results are restored when you come back, even the next day. Lists you save to the workspace are stored for the whole team and can be reopened any time.

Question 11

Can several people work on the same lists?

Accepted Answer

Yes. Every workspace is invite-only with admin and member roles. Saved lists are shared with the team, each with a campaign name and notes, and an activity feed shows who saved, opened or exported what.

Question 12

How do I get access?

Accepted Answer

DataDesk is in early access. Use the request form below — tell us a little about your team, and we’ll set up your workspace and send you an invite, usually within one business day.

Merge, clean & validate lead lists — without the spreadsheet pain