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 List Cleaner

Clean, normalize, filter, and deduplicate large text lists in seconds. List Cleaner works for names, email addresses, addresses, product lists, phone numbers, logs, and general multiline text. All processing runs locally in your browser.


Designed for very large inputs, including 100,000+ lines.
Presets
Apply one-click presets for common cleanup scenarios.
Whitespace
Duplicates
Text normalization
Filters and sorting
Statistics
Original lines0
Lines after processing0
Empty/whitespace removed0
Duplicates removed0
Filtered lines removed0
Before/After preview
Before (first 8 lines)

                            

                            

                                
After (first 8 lines)

                                

                            

                        

                    

                

            

        

    













    



⭐ About List Cleaner


List Cleaner is a configurable list cleanup tool for large multiline datasets. It removes noise, normalizes formatting, applies filters, and removes duplicates based on your exact settings. It does not rewrite, translate, or reinterpret your content.






⚙️ What List Cleaner can do


    
    
  • Clean whitespace issues such as tabs, multiple spaces, and invisible Unicode characters
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  • Normalize line breaks and apply case formatting when requested
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  • Remove exact duplicates and optional near duplicates (fuzzy mode)
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  • Filter lines by length, regex, and contains rules
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  • Sort output alphabetically or by line length
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  • Export cleaned output as TXT, CSV, or JSON
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🔎 Common use cases


    
    
  • Name lists and contact lists
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  • Email list cleanup and normalization
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  • Address list deduplication
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  • Product list normalization
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  • Computer log cleanup before analysis
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  • General text list preprocessing
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⚙️ Processing order


    
    
  1. Normalize line breaks
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  2. Run Unicode cleanup
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  3. Replace tabs
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  4. Trim whitespace
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  5. Normalize spacing
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  6. Remove empty or whitespace-only lines
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  7. Apply filters
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  8. Remove duplicates
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  9. Sort (if enabled)
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  10. Generate final output and statistics
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✅ Privacy and safety


    
    
  • All processing is local in your browser
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  • No server upload is required
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  • The tool only cleans, normalizes, filters, and deduplicates text based on selected settings
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  • The tool does not perform spelling correction, AI rewriting, translation, or assumption-based deletion
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💡 Tips for large lists


    
    
  • Start with the General List preset
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  • Enable only needed filters to keep processing fast
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  • Use exact deduplication first, then enable fuzzy matching only if required
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  • Use Undo and presets to compare cleanup strategies quickly
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 This tool is also known as

		
    
			
  • list cleaner online
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  • clean and deduplicate list
    • 
			
  • normalize text list tool
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  • remove duplicates from large list
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  • list cleanup tool for names emails logs
    • 
		


    





	

	
Frequently Asked Questions

	

		

			
		

		

			

				List Cleaner cleans, normalizes, filters, and deduplicates multiline text lists using your selected settings.
			

		

		

			
		

		

			

				Yes. The tool is built for large inputs and uses efficient line-by-line processing with hash-based deduplication.
			

		

		

			
		

		

			

				Yes. When Preserve original order is enabled, the output keeps the input order for retained lines.
			

		

		

			
		

		

			

				Yes. You can remove empty lines and lines that contain only whitespace characters.
			

		

		

			
		

		

			

				Yes. Disable case-sensitive comparison to treat lines like Apple and apple as duplicates.
			

		

		

			
		

		

			

				Fuzzy matching removes near-identical lines by similarity threshold, useful for small variations such as punctuation or minor typos.
			

		

		

			
		

		

			

				Yes. You can keep only lines that match a regex or remove lines that match a regex pattern.
			

		

		

			
		

		

			

				Yes. You can keep only lines containing specific text or remove lines containing specific text.
			

		

		

			
		

		

			

				Yes. You can upload .txt and .csv files, or drag and drop text files into the tool.
			

		

		

			
		

		

			

				Yes. Use Download as to export the output in TXT, CSV, or JSON format.
			

		

		

			
		

		

			

				Yes. List Cleaner saves your settings in local storage and can restore them on your next visit.
			

		

		

			
		

		

			

				No. All processing is done locally in your browser, so your data stays on your device.
			

		

	







	

		
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