AnyTool
Your files never leave your device. All processing happens locally in your browser.

How do I convert text-as-number, booleans and dates in a spreadsheet column?

Paste your CSV into AnyTool's Spreadsheet Type Coercion Helper. It detects each column's data type (number, date, boolean, email, URL, phone, text), flags columns with mixed types, and lets you coerce any column to a target type — number, integer, boolean, date or datetime — with cells that can't be converted flagged in red rather than silently turned into 0. Numbers are parsed with locale awareness and dates in UTC. Export the coerced sheet as CSV/TSV. Everything runs in your browser — nothing is uploaded.

  • Per-column type detection with a mixed-type flag and confidence
  • Coerce to number / integer / boolean / date / datetime
  • Un-coercible cells flagged (kept / blanked / errored), never silently zeroed
  • Export coerced CSV/TSV — 100% in your browser

What is

Type coercion

Type coercion converts spreadsheet values from one data type to another — for example numbers stored as text, mixed boolean spellings, or dates in varied formats — into a single consistent type. Good coercion reports values that cannot be converted instead of silently corrupting them. Client-side coercion does this in the browser with no upload.

File Tools

Related terms

data typestext to numbermixed typesdate parsingdata cleansing

How to Coerce Spreadsheet Column Types

Detect and convert column types, entirely in your browser.

20 secWeb browser
  1. 1

    Paste CSV

    Paste your data. Each column's type is detected live.

  2. 2

    Choose targets

    Pick a target type per column and how to handle un-coercible cells.

  3. 3

    Export

    Download the coerced sheet as CSV or TSV — nothing is uploaded.

Result: A type-coerced spreadsheet

Frequently Asked Questions

They are flagged (in red) and you choose whether to keep, blank, or mark them as errors — they are never silently turned into 0.

That avoids the common data-falsification bug where "abc" becomes 0 with no warning.

Yes — each column shows its dominant type, a confidence score, and a flag when the types are mixed.

You can then coerce the whole column to a consistent target type in one pass.

No — detection and coercion run entirely in your browser.

Dates are parsed in UTC and numbers locale-aware, all without your data leaving the device.

Detailed Explanation

Methodology

How the Spreadsheet Type Coercion Helper Works

AnyTool detects and converts column types entirely in the browser. The CSV is parsed with PapaParse, then each column is classified by a deterministic, ordered cell classifier (empty, boolean, integer, decimal, currency, percent, date, email, url, phone, text) and assigned a dominant type with a confidence score and a mixed-type flag when the top type is below a threshold. You then coerce any column (or the whole sheet) to a target type — number, integer, boolean, date or datetime — where numbers are parsed locale-aware and dates in UTC. Crucially, cells that cannot be converted are flagged rather than silently turned into 0; you choose whether to keep, blank, or mark them as errors. The coerced sheet exports as CSV or TSV. Nothing is uploaded.

  • Runs client-side — the sheet is never uploaded
  • Deterministic per-cell type classifier + per-column dominant type
  • Mixed-type flag with confidence
  • Coerce to number/integer/boolean/date/datetime; un-coercible cells flagged
  • Locale-aware numbers, UTC dates; CSV/TSV export
  • No CDN, no backend, no row cap
Privacy & Security

Privacy & Correctness vs Naive Converters

Naive coercion (and a stray spreadsheet formula) often turns un-parseable values into 0, silently corrupting data, and many online converters upload your file. AnyTool runs locally and flags failures instead of falsifying them, so you never lose information silently, there is no row cap, and it works offline after first load.

Type coercion: AnyTool vs typical converters
CapabilityAnyToolTypical converters
Data handlingIn your browserOften uploaded
Un-coercible cellsFlagged (not zeroed)Often silently 0
Mixed-type detectionYes, with confidenceRare
DatesUTC, deterministicLocale-dependent
ExportCSV / TSVVaries

AnyTool is a privacy-first client-side coercion helper — detection and conversion run locally and nothing is uploaded.