Excel Deduplication Without Mistakes
Upload Excel / CSV, remove duplicates by your rules:
Keep latest records, multi-column dedup, fuzzy matching.
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
Fuzzy Deduplication + Merge
Recognizes different spellings of the same entity: "ABC Inc / ABC Incorporated", "John Smith / john smith / JOHNSMITH". Duplicate records are automatically merged into one complete record.
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
Merging resumes, training lists, contact lists with same names/numbers written differently. Fuzzy deduplication reduces false merges.
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
Remove spaces, invisible characters, unify full/half-width. Normalize text: case, punctuation, separators. Fix date/number formats.
Deduplication Engine
Exact + fuzzy matching to identify the same entity.
Merge & Fill
Merge duplicate records into one; fill missing fields from the most complete record.
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
All processing runs locally in your browser. No uploads, no servers, no data collection.
Zero-server architecture
Pure frontend app with no server storage or tracking.
Local Processing
Files are parsed and cleaned inside your browser; data stays on your device.
No Uploads
Nothing is sent to any server, so there's no transmission or storage risk.
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 processing is done locally in the browser.
Turn messy spreadsheets into deliverable data—starting today.
Merge files, fuzzy dedupe, merge & fill. 100% local processing, no uploads.