Tellsheet

Tellsheet turns messy spreadsheets into clean data — fast, and without risk. Tell it what you want in plain English or pick a tool from the ribbon, preview the exact change, then apply it. Your spreadsheet never leaves your computer.

Dozens of tools for the jobs Excel makes harder than they should be:

• Clean & fix: trim spaces and invisible characters, fix mojibake (garbled encoding), remove accents, standardize inconsistent values, normalize phone numbers.

• Text: split, merge, change case, extract, regex find & replace, count words/characters.

• Reshape: transpose, unpivot, split to rows or sheets, unmerge & fill down, merge duplicates, JSON to columns.

• Data: convert text to numbers/dates, fix European numbers, round, flag duplicates, column health scan, validate data against your own rules, scan for PII, anonymize & mask, sum by color.

• Analytics: rank, running total, percent of total, cumulative % (Pareto), flag outliers, group & summarize, random sample.

• Match & compare: lookup values, merge by key, reconcile two tables, Match Doctor, compare two columns, fuzzy-match near-duplicates, diff two ranges cell-by-cell.

• Formulas: Explain Formula (plain-English breakdown plus a one-click fix), Formula Map (trace precedents, dependents, and #REF!/#VALUE! errors).

• Visualize: Instant Dashboard, Interactive Report (live cross-filtering — click any chart to filter every visual).

Why teams trust it:

• Preview before apply — see the exact before/after of every change.

• Change Ledger — a persistent history with one-click revert, saved inside your workbook.

• Private by design — transforms run locally in the add-in; your data is never uploaded.

• Cross-platform — Excel on the web, Windows, Mac, and Microsoft 365.

Free vs Pro: A core set of tools is free forever. Pro unlocks the full toolkit plus the AI command bar for a one-time $39 (no subscription) — team ($29/seat, 5+) and site ($499) licenses too. Get a license key at https://tellsheet.com/pricing.