CleanSheet

Clean your spreadsheets in seconds. No code required.

Upload any Excel or CSV file. CleanSheet detects duplicates, trims whitespace, normalizes text, handles missing values, and exports a clean file. All in your browser.

Your data stays on your computer.

CleanSheet runs entirely in your browser. Your files are never uploaded, sent, or shared. Everything happens locally.

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Features

Professional Data Cleaning

Everything you need to prepare clean, reliable datasets.

Fix Garbled Text

Automatically repair encoding issues like "ÃƒÂ©milie" to "Émilie" and corrupted characters.

Correct Typos

Smart detection of common typos. "Nroth Amrica" becomes "North America" automatically.

Duplicate Removal

Automatically detect and remove duplicate rows to keep your data unique and clean.

Whitespace & Trimming

Remove leading, trailing, and extra spaces. Normalize whitespace across all cells.

Case Normalization

Convert "JANE SMITH" to "Jane Smith". Fix inconsistent capitalization across columns.

100% Private

All processing happens in your browser. Your data never leaves your device.

The Principle

How CleanSheet Cleans Your Data

No black box. Here's exactly what happens to every cell, step by step.

Detect Column Types

CleanSheet scans each column and identifies its type: text, number, date, email, phone, URL, or zip code. This ensures the right cleaning rules are applied.

Example: Column "Email" detected → applies lowercase + space removal rules

Apply Safe Auto-Fixes

Reversible, deterministic operations are applied automatically: removing empty rows, trimming whitespace, fixing encoding, normalizing formats. No guesswork.

Example: " John DOE " → trim → "John DOE" (safe, lossless)

Flag Anomalies for Review

Ambiguous changes are never applied silently. Suspected typos, unusual values, and pattern mismatches are flagged and presented for your approval.

Result: "Nroth Amrica" flagged → you decide: accept "North America" or keep original

Encoding Repair

Detects mojibake (garbled characters) caused by UTF-8/Latin-1 mismatches. Maps corrupted byte sequences back to the correct Unicode characters.

"ÃƒÂ©" → "é" · "Ã¼" → "ü" · "â€™" → "'"

Typo Detection

Uses Levenshtein distance to find values that are close but not identical. Groups similar values and suggests the most frequent spelling as the correction.

"Amrica" vs "America" → distance 1 → flagged for review

Number Normalization

Strips currency symbols, handles both "1,234.56" and "1.234,56" formats, and converts text-as-numbers to actual numeric values with your chosen precision.

"€12.500,00" → 12500.00 · "$1,234.56" → 1234.56

Duplicate Detection

Compares rows cell-by-cell after normalization. Keeps the first occurrence and removes exact duplicates. Near-duplicates are flagged for your review.

Row 1 = Row 5 after trim + lowercase → Row 5 removed

Deterministic Rules

Every fix follows clear, rule-based logic. The same input always produces the same output.

Transparent Logic

Every change is logged. The cleaning report shows exactly what was modified and why.

You Stay in Control

Review anomalies before they're applied. Compare before/after side by side. Export the full report.

100% Private

All processing happens in your browser. No data is ever sent to any server.

FAQ

Frequently Asked Questions

Is my data really private? +

Yes, 100%. CleanSheetSmart runs entirely in your browser. Your files are processed locally on your computer and are never uploaded to any server. You can even use it offline.

What file formats are supported? +

CleanSheetSmart supports CSV (.csv) and Excel files (.xlsx, .xls). You can export your cleaned data in both formats (Excel export is a Smart Pro feature).

How do I get the Smart Pro version? +

Click "Get Smart Pro" and complete the purchase via Stripe. You will instantly receive a ZIP file containing the full Smart Pro version. Simply unzip and open index.html in your browser. No installation needed.

Does it work offline? +

Yes. Once loaded, CleanSheetSmart works completely offline. All processing happens locally in your browser with no internet connection required.

CleanSheet

Professional Data Cleaning

Fix Garbled Text

Correct Typos

Duplicate Removal

Whitespace & Trimming

Case Normalization

100% Private

Three Simple Steps

Upload Your File

Choose Options

Download Clean Data

How CleanSheet Cleans Your Data

Detect Column Types

Apply Safe Auto-Fixes

Flag Anomalies for Review

Encoding Repair

Typo Detection

Number Normalization

Duplicate Detection

Clean Your Data

Drop your file here

Cleaning Options

Smart Detection PRO

Basic Cleanup (Recommended)

Numbers & Dates

Text Formatting

Cleaning Report

Smart Review

Cleaned Data Preview (First 10 rows)

Original Data (First 10 rows)

Cell-by-Cell Changes

Smart Column Analysis

Simple, Fair Pricing

Free Demo

Smart Pro

Frequently Asked Questions

Ready to Clean Your Data?