Excel Deduplication Without Mistakes
Upload Excel / CSV, remove duplicates by your rules:
Keep latest records, use multiple columns, or apply numeric tolerance.
Preview before export, 100% browser-based processing.
Drop your spreadsheets here
Multiple files and multiple sheets supported
Import
Multiple Excel/CSV files (multi-sheet supported)
Configure
Set cleaning + dedupe + merge rules
Preview & Export
Review changes and download deliverable data
Why Choose SheetCleaner
Rule-Based Deduplication + Merge
Compare records with explicit rules for case, edge whitespace, symbols, numeric tolerance, or regex extraction, then choose how duplicates are retained or merged.
Multi-file / multi-sheet in one go
Import multiple files and sheets at once, clean and dedupe across all of them.
Privacy First (Local Processing)
No need to upload sensitive data to third parties: ideal for customer lists, channel data, financial records, and HR scenarios.
Use Cases
Event Registration / Lead Collection
Registration and lead forms from multiple channels: lots of duplicates, messy fields, inconsistent formats. Quickly merge and output analytics-ready data.
Customer List Integration
Customer lists passed around repeatedly, high duplication, incomplete info. Auto-dedupe + merge to make CRM import succeed first time.
Supplier / Reconciliation Data
Supplier, reconciliation, and invoicing info in inconsistent formats making verification difficult. One-click field standardization reduces manual alignment and errors.
Resume / Contact List Merge
Merge resumes, training lists, or contact lists with explicit multi-column and retention rules.
Core Features
Import & Structure Recognition
Supports Excel / CSV (multi-file, multi-sheet), auto-detects headers, blank rows/columns, misaligned structures. Column alignment via intersection/union.
Standardization & Cleaning
Compare text while optionally ignoring case, edge whitespace, or symbols. Exported cell values are not rewritten.
Deduplication Engine
Exact comparison plus numeric tolerance and regex extraction.
Merge & Fill
Merge duplicate records with an explicit fill, concatenate, or prefer-non-empty rule.
Change Preview & Export
See deletions/updates/merges before export; one-click download of clean data.
Three Steps to Clean Data
Import
Multiple Excel/CSV files (multi-sheet supported)
Configure
Set cleaning + dedupe + merge rules
Preview & Export
Review changes and download deliverable data
Privacy-first by design
Spreadsheet file contents are processed locally in your browser and are not uploaded.
No spreadsheet uploads
No server-side spreadsheet storage or third-party behavior tracking.
Local Processing
Files are parsed and cleaned inside your browser; data stays on your device.
No Uploads
Spreadsheet file contents are not sent to an application server or stored remotely.
Works Offline
After loading, you can disconnect and keep cleaning.
Instant Processing
Results are generated immediately—no queues or waiting.
Frequently Asked Questions
What you need to know about Excel deduplication
Select the date or time column as the rule to automatically keep the latest record, and merge or delete the rest.
Yes. Combination keys like Name + Phone, Email + Company are all supported.
No direct deletion. You can preview the results first and export after confirmation.
SheetCleaner is optimized for large tables to avoid common Excel freezing and crashes.
Yes. CSV can be mixed with Excel for processing and cross-file deduplication.
No. All spreadsheet-content processing is done locally in the browser.
Turn messy spreadsheets into deliverable data—starting today.
Merge files, apply rule-based deduplication, and fill empty fields. File contents stay local.