Tools

Free Spreadsheet Tools

Four engines, one purpose: get your spreadsheet data into the right shape, fast. Everything runs in your browser.

Convert

Move data between formats without losing types, encoding, or precision.

Convert a CSV file into a properly formatted XLSX workbook.

Export an XLSX workbook to clean CSV with encoding options.

Turn a CSV file into a JSON array of objects, header-keyed.

Flatten a JSON array into a CSV file, headers detected automatically.

Validate

Lint structural, encoding, and type problems before they break your pipeline.

Soon

Check a CSV file for delimiter, quoting, and encoding issues.

Soon

Parse and validate a JSON file, with line numbers for errors.

Soon

Surface formula errors, broken references, and type drift in an XLSX file.

Extract

Pull tabular data out of non-tabular sources — HTML, fixed-width text, PDFs.

Find and remove duplicate rows from a spreadsheet in seconds.

Soon

Paste an HTML table and get a clean CSV back.

Soon

Auto-detect delimiters or fixed-width columns in raw text.

Generate

Spin up realistic test data, mock CSVs, or sample workbooks from scratch.

Soon

Generate a CSV file with realistic sample data and configurable schema.

Soon

Mock data in the format of your choice — CSV, JSON, or XLSX.

Soon

Generate JSON test fixtures from a schema definition.

Need to diff two files?

Drop two spreadsheets and see every change in seconds. Free, private, runs in your browser.