CleanMySheet guide

Clean spreadsheets without uploading your data

Parsing and cleaning run in JavaScript on your device. Strict mode is on by default, so optional Haiku column classification is off. Files are not stored on CleanMySheet servers. Auth is only requested at download if you connect Supabase.

Open the cleaner

Steps

Keep Strict on
Drop the file
Clean and preview
Download locally

India, EU, and healthcare ops

If policy forbids sending personal data to a US API, stay in Strict mode. The product still works; type detection is heuristic-only.

Recipes stay portable

A .cleanmysheet.json file is operations and column locks—not your rows. You can share a recipe without sharing the sheet.

Related guides

Clean a CSV online without uploading it
Clean CSV files in your browser: trim spaces, fix dates, remove duplicates, split names, and export. CleanMySheet never uploads your sheet in Strict mode.
Clean Excel (XLSX) files in the browser
Fix Excel spreadsheets locally: serial dates, accounting negatives, duplicates, multi-sheet workbooks. CleanMySheet parses XLSX in your browser.
Clean CRM contacts from a spreadsheet export
CRM Cleanup preset: trim, unify empties, split names, format phones and emails, remove exact duplicates — in the browser.

Clean spreadsheets without uploading your data

Steps

India, EU, and healthcare ops

Recipes stay portable

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