FREE TEXT TOOL

Text Diff Checker

Paste an original text and a changed text to find line changes, word differences, and a similarity score.

Text Input

Paste two texts to compare

Similarity
Added Lines
Removed Lines
Changed Lines
Same Lines
Original Lines
Changed Total Lines

Word Summary

Added and removed words

Original Words
Changed Words
Added Words
Removed Words
Net Difference

Added words

Removed words

Plain Summary Report


                                

                            

                        


                        

                            

                                

                                    
                                    

                                        
Side-by-side Diff

                                        
Original and changed lines

                                    

                                

                                

                            

                        

                    

                

            

        

    


    

        

            

                
Intro

                
Text Diff Checker helps you compare two versions of text and quickly see what stayed the same, what was added, what was removed, and what changed.


                
How to use

                
    
                    
  1. Paste the older or original version into Original Text.
    2. 
                    
  2. Paste the newer or edited version into Changed Text.
    3. 
                    
  3. Choose comparison options such as ignoring extra spaces, case, or blank lines.
    4. 
                    
  4. Click Compare Text, then review the summary, word details, and side-by-side diff.
    5. 
                


                
What this text diff checker can do

                
The tool calculates similarity percentage, original and changed line totals, added lines, removed lines, changed lines, same lines, added words, removed words, and a plain text report.


                
Side-by-side comparison explanation

                
The side-by-side view places original content on the left and changed content on the right. Same lines use a neutral style, additions use green, removals use red, and changed lines use a soft warning color.


                
Added and removed text explanation

                
Added text is content that appears in the changed version but not in the original. Removed text is content that appeared in the original and is missing from the changed version.


                
Similarity percentage explanation

                
Similarity percentage is calculated from the normalized text using Python's sequence comparison logic. A score of 100% means the compared text is treated as identical under the selected options.


                
Ignore case explanation

                
Ignore Case treats uppercase and lowercase versions of the same letters as equal during comparison while still displaying your original pasted text safely.


                
Ignore spaces explanation

                
Ignore Extra Spaces trims lines and treats repeated spaces or tabs as one space. This is useful when formatting changed but the words did not.


                
Use cases

                
Use Text Diff Checker for editing drafts, reviewing copied notes, comparing product descriptions, checking policy text changes, comparing code snippets as plain text, or reviewing content updates before publishing.


                
FAQ section

                
Is my text stored? No. Text is compared from the active request only and is not written to files or permanent storage.

                
Can I compare HTML? Yes. Pasted HTML is treated as plain text and displayed safely.

                
What is the size limit? The first production version accepts up to 100,000 characters per textarea.