Online Text Diff

Find differences between two texts — instantly, right in your browser

Paste the original into the left field, and the modified version into the right one. Results appear immediately: green highlights added fragments, red with strikethrough marks removed ones, gray shows matching parts. Comparison works at the character level, so even tiny edits — like a single character change in a line of code — are caught.

Comparison result


                
            

        


        

            
Features

            
    
                                    
  • Instant comparison as you type — no buttons, no reloads.
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  • Character-level precision: catches even one-character edits.
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  • Fully client-side — your texts never leave your browser.
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  • Unicode support: Cyrillic, CJK, emoji, special characters.
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  • Free, no sign-up, no limits.
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  • Powered by Google's diff-match-patch — industry-standard diff algorithm.
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How to compare two texts

            
    
                                    
  1. Paste the first (original) text into the left "Text 1" field.
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  2. Paste the second (modified) text into the right "Text 2" field.
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  3. The comparison result appears below automatically — no button clicks needed.
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  4. Green = added, red with strikethrough = removed, gray = unchanged.
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When text diff is useful

            
    
                                    
  • Code review and debugging — compare two versions of a function, config file, or SQL query.
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  • Translation checks — verify a translation against the original for discrepancies.
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  • Article editing — see exactly what your editor changed in your draft.
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  • SEO — compare meta tags, landing page copy, or H1 variants across pages.
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  • Documents — find edits in a contract, spec, or technical documentation.
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  • Logs and dumps — spot differences between two API responses or database snapshots.
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Why compare texts

            
Text comparison is a fundamental task when working with any content. Developers use diff for code review and regression detection, editors use it to track changes in documents, translators use it to verify translations against the original. Our tool runs entirely in your browser: your data is never sent to a server, and comparison results appear instantly as you type. Under the hood it uses Google's diff-match-patch algorithm, which provides high-quality comparison even for large volumes of text.

        


        

            
FAQ

                            

                    Are my texts sent to a server?
                    
No. Comparison runs entirely in your browser with JavaScript. Your data never leaves your device — it's safe to compare private documents, config secrets, NDA materials, or source code.

                

                            

                    Is there a size limit?
                    
There's no hard limit — only your browser's memory. In practice, texts up to several megabytes are compared in a fraction of a second. For very large files (tens of MB), comparison may take a few seconds.

                

                            

                    Does it work for source code?
                    
Yes, the tool handles plain text, code in any language, JSON, XML, YAML, and Markdown equally well. Character-level highlighting helps spot even a single-letter typo.

                

                            

                    Does it support Cyrillic and emoji?
                    
Yes. The tool handles Unicode correctly: Russian, English, Chinese characters, emoji, and any special symbols.

                

                            

                    Can I save or share the result?
                    
For now, the result is shown only in your browser. You can copy the highlighted output or take a screenshot. A shareable link feature is planned.

                

                            

                    What algorithm powers the comparison?
                    
It uses diff-match-patch, an algorithm developed by Google engineers. It's fast, supports character-level comparison, and groups changes intelligently for easy reading.

                

                    


        

            
The online text comparison tool is a fast and convenient way to find differences between two versions of a text. You can compare source code, articles, configuration files, translations, and any other textual content. Results are displayed in real time: added fragments are highlighted in green, deleted ones in red with strikethrough, and matching parts in gray. This format lets you instantly see exactly what has changed.

            
The tool is especially useful for developers during code review, comparing configs across environments, or verifying auto-generated code. Editors and copywriters can use it to track changes between drafts, while SEO specialists can compare meta tags or page content. All processing happens client-side — your data never leaves the browser.

            
Under the hood, the tool uses the diff-match-patch algorithm developed by Google engineers. It provides accurate character-level comparison and works correctly with Unicode, including Cyrillic, CJK characters, and special symbols. The tool requires no registration, is completely free, and is available in both Russian and English. Just paste two texts — and the differences will be visible instantly.