Tutorials & Guides
Step-by-step guides for Excel/CSV deduplication and data cleaning
Featured Tutorials
Preview Excel Duplicates Before Removing: Real-Time Deduplication Preview Guide
See exactly which rows will be kept or removed before processing. SheetCleaner real-time preview feature lets you validate deduplication rules instantly with color-coded results.
Excel Cross-Sheet Deduplication Tutorial: Handle Duplicate Data Across Multiple Worksheets
Learn how to deduplicate across multiple worksheets, supporting multi-column combinations and smart strategies for large files.
Excel Deduplication with Keep Rules: Retain First/Latest Record Guide
Comprehensive guide to Excel deduplication retention rules: keep first, keep latest, keep max value, multi-tier rules. Provides SheetCleaner, Power Query, and Excel 365 formula implementations with complete examples and best practices.
All Articles
Preview Excel Duplicates Before Removing: Real-Time Deduplication Preview Guide
See exactly which rows will be kept or removed before processing. SheetCleaner real-time preview feature lets you validate deduplication rules instantly with color-coded results.
How to Review SheetCleaner Deduplication Results
Learn how to verify kept rows, removed rows, and the reduction summary before downloading your cleaned spreadsheet.
CSV Batch Deduplication: Big Data & Cross-Platform
Learn how to batch process multiple CSV files and handle encoding, delimiters, leading zeros, and other common issues. Includes Python script examples for larger workflows.
E-commerce Sellers: Orders/Customer Data Deduplication & Cleansing Guide (SKU/Email/Phone)
Complete e-commerce data cleansing guide: prevent duplicate order imports, merge customer information, aggregate SKU variants. Support multi-channel order deduplication, customer CLV calculation, product inventory integration with both Power Query and SheetCleaner solutions.
Why Excel's Built-in "Remove Duplicates" Isn't Enough? (3 Better Solutions)
5 major limitations of Excel's built-in deduplication feature: no cross-sheet support, no retention rules, no fuzzy matching, no duplicate details, crashes on big data. Provides three more stable solutions: SheetCleaner, Power Query, and Excel 365 formulas.
Excel Cross-Sheet Deduplication Tutorial: Handle Duplicate Data Across Multiple Worksheets
Learn how to deduplicate across multiple worksheets, supporting multi-column combinations and smart strategies for large files.
Excel Deduplication with Keep Rules: Retain First/Latest Record Guide
Comprehensive guide to Excel deduplication retention rules: keep first, keep latest, keep max value, multi-tier rules. Provides SheetCleaner, Power Query, and Excel 365 formula implementations with complete examples and best practices.
Excel Large-File Deduplication Without Crashing: Performance Optimization & Crash Prevention Guide
Professional guide for Excel big data processing: 64-bit environment setup, CSV optimization, batch processing strategies. Reduce large-file freezing, memory pressure, and program crashes with SheetCleaner, Power Query, and Python scripts.
Excel Email Deduplication: Case, Dots & Plus Aliases All Covered
Professional guide for marketing email list cleaning: handle case differences, Gmail dot rules, +alias tags. Supports complex scenarios like ZHANG.SAN@EXAMPLE.COM vs zhangsan@example.com, alice+ads@gmail.com vs alice@gmail.com.
Remove Duplicate Phone Numbers in Excel: 3 Methods
Remove duplicate phone numbers in Excel using a helper formula, Power Query, or SheetCleaner. Standardize country codes first, then keep the newest record.
Excel Fuzzy Deduplication: Standardization Strategy Checklist, Fuzzy Merge Parameters, Formula & M Code Templates
Find and correctly merge records that look different but are actually the same—covering case, whitespace, symbols, full/half-width, email aliases, phone country codes, approximate spelling, etc.
Google Sheets Deduplication: Functions, Conditional Formatting & Online Tools Comparison (UNIQUE / SORTN / QUERY)
Complete online collaborative data deduplication guide: Google Sheets built-in functions UNIQUE, SORTN, QUERY comparison, conditional formatting to mark duplicates, cross-sheet merge deduplication solutions. Suitable for Google Forms surveys, shared sheets, online collaboration scenarios.
Merge Multiple Customer Lists and Remove Duplicates (Downloadable Template Included)
Professional guide for multi-channel customer list merging: unify field formats, intelligent deduplication, keep latest records. Suitable for form collection, offline events, social media promotion and other multi-source customer data integration with scoring and source tracking.
Excel Multi-Column Deduplication: Keep Unique Data by Combined Conditions
Learn how to use multi-column combinations as unique keys for deduplication, supporting keep-latest, keep-highest rules for customer, product, and order scenarios.
Research/Survey Data Batch Deduplication: Email/Organization/Time Window Composite Key Practice
Professional guide for academic research and survey data cleaning: handle duplicate responses, cross-batch merging, organization name standardization, time window deduplication. Support privacy compliance, retention rule configuration, audit tracking, suitable for academic research, market research, user feedback and other scenarios.
Popular Workflows
Master data deduplication with our proven workflows
Customer List Merge → Deduplication → Export
Multi-Sheet Import → Cross-Sheet Dedup → Clean Export
CSV Upload → Email/Phone Cleaning → Download