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🔒 Private: both texts are compared entirely in your browser using a local diff engine — nothing is uploaded, and your drafts auto-save only to your own device.
Compare two pieces of text or code and instantly see what's added, removed or changed — with word, line, character, sentence and paragraph diffs; inline, side-by-side and unified views; ignore options; statistics, change navigation and export. 100% private, processed in your browser.
Compare by word, line, character, sentence or paragraph — whichever suits your content.
Inline highlights, a two-column side-by-side view, or a Git-style unified diff.
Ignore case, whitespace, empty lines, line endings and trailing spaces; normalise Unicode.
Added, removed and changed words, total lines and characters, and a similarity percentage.
Numbered editors with word-wrap and a distraction-free fullscreen mode.
Jump to the next or previous change and collapse long unchanged sections.
Results update as you type, with a search box that highlights matches in the diff.
Load TXT, HTML, CSS, JS, JSON, XML, CSV, Markdown, LOG and more into either side.
Export the diff as HTML, Markdown, JSON, a unified patch, or print to PDF.
Optional lightweight syntax colouring for strings, comments, numbers and keywords.
Your two drafts are remembered locally so you never lose work on refresh.
Everything runs in your browser. No uploads, no sign-up, works offline.
The ApneSoftware Text & Code Diff Checker is a professional, privacy-first comparison utility that finds the differences between two versions of any text or code — instantly, and entirely inside your browser. Whether you are reviewing an edited document, checking what changed between two versions of a source file, comparing configuration files, verifying a copy-paste, or auditing a contract, a diff tool turns the tedious job of spotting changes into a single glance. Where a basic checker only offers one kind of comparison, this tool gives you five diff modes — word, line, character, sentence and paragraph — and three views — inline highlighting, a two-column side-by-side layout, and a Git-style unified patch — so you can look at the same change in whichever way makes it clearest.
The heart of any diff tool is its comparison engine, and this one uses a robust, well-tested algorithm (the classic Myers diff) to produce minimal, accurate change sets. Additions are highlighted in green, removals in red, and in side-by-side mode changed lines are further broken down with intra-line word highlighting, so you can see exactly which words within a line were altered rather than the whole line simply flashing as changed. The tool reports clear statistics — how many words were added, removed and changed, the total number of lines and characters, and an overall similarity percentage — giving you an at-a-glance sense of how big the change really is. A change-navigation bar lets you jump straight to the next or previous difference, and long stretches of unchanged content can be collapsed so you focus only on what matters.
Comparison options make the tool fair to your content. Real-world text is full of cosmetic differences that are not real changes — a different capitalisation, extra spaces, tabs versus spaces, blank lines, or Windows versus Unix line endings. You can choose to ignore case, ignore whitespace, ignore empty lines, trim trailing spaces and ignore line endings, and normalise Unicode so that visually identical characters compare equal. With these switches you can filter out the noise and see only the differences that actually matter — invaluable when comparing code that was reformatted, or documents that were re-saved by a different editor. The two editors include line numbers, an optional word-wrap toggle, a fullscreen mode for large files, and one-click file import so you can load TXT, HTML, CSS, JavaScript, JSON, XML, CSV, Markdown, LOG and other files directly into either side.
For developers, the tool speaks your language. The unified-patch export produces the exact --- / +++ / @@ format used by Git and patch, ready to attach to a code review or apply elsewhere. An optional lightweight syntax highlighter colours strings, comments, numbers and keywords in the side-by-side view for common languages, making code diffs easier to read without any heavy dependency. You can export the result as a self-contained HTML report, a Markdown diff block, structured JSON of the change set, or print it to PDF — and copy the highlighted output to your clipboard in a click. Live compare updates the result as you type, a search box highlights matches within the diff, swap flips the two sides, and your drafts auto-save locally so a refresh never loses your work.
Privacy and performance are fundamental. Both texts are compared with JavaScript running on your own device; nothing you paste, no file you load and no result you generate is ever uploaded to a server, and there is no account, login or tracking. This matters a great deal when the material is confidential — legal documents, proprietary source code, medical data or unreleased content — because a diff tool that transmitted your text would be a serious leak. Because all processing is local, comparisons are fast even for large inputs, and the tool keeps working with no internet connection once the page has loaded. Sensible safeguards keep the interface responsive on big files, and the diff is rendered efficiently so the page stays smooth.
Finally, the tool is built to modern standards of accessibility, responsiveness and maintainability. The controls are keyboard-navigable and labelled for screen readers, focus outlines are visible, and high-contrast preferences are respected; the result area is a focusable region so keyboard users can scroll and search it easily. The layout adapts from wide desktop monitors — where the two editors and the side-by-side view sit comfortably next to each other — down to tablets and phones, where they stack cleanly with touch-friendly controls. Internally, the diff modes, view renderers, options and export formats are organised into small, well-defined functions, so the tool is accurate, easy to audit and simple to extend. In short, it is a fast, private, developer-grade diff checker suitable for everyday writing and editing, for serious code review, and for a professional comparison platform alike.
ApneSoftware Text & Code Diff Checker एक professional, privacy-first comparison utility है जो किसी भी text या code के दो versions के बीच अंतर ढूँढता है — तुरंत, और पूरी तरह आपके browser के अंदर। चाहे आप कोई edited document review कर रहे हों, किसी source file के दो versions के बीच बदलाव जाँच रहे हों, configuration files की तुलना कर रहे हों, या किसी contract का audit कर रहे हों — एक diff tool बदलाव खोजने के थकाऊ काम को एक नज़र में बदल देता है। जहाँ एक साधारण checker सिर्फ़ एक तरह की तुलना देता है, वहीं यह टूल पाँच diff modes — word, line, character, sentence और paragraph — और तीन views — inline highlighting, दो-column side-by-side layout, और Git-style unified patch — देता है, ताकि आप एक ही बदलाव को उस तरीके से देखें जो सबसे स्पष्ट हो।
किसी भी diff tool का दिल उसका comparison engine होता है, और यह एक मज़बूत, अच्छी तरह परखे गए algorithm (classic Myers diff) का उपयोग करता है ताकि minimal, सटीक change sets बनें। जोड़े गए हिस्से हरे में, हटाए गए लाल में highlight होते हैं, और side-by-side mode में बदली हुई lines को intra-line word highlighting से और बारीकी से दिखाया जाता है, ताकि आप देख सकें कि line के भीतर कौन-से शब्द बदले। टूल स्पष्ट statistics बताता है — कितने शब्द जोड़े, हटाए और बदले गए, कुल lines व characters, और एक समग्र similarity percentage। एक change-navigation bar से आप सीधे अगले या पिछले अंतर पर जा सकते हैं, और unchanged content के लंबे हिस्सों को collapse कर सकते हैं।
Comparison options टूल को आपके content के प्रति निष्पक्ष बनाते हैं। असली text में कई cosmetic अंतर होते हैं जो वास्तविक बदलाव नहीं होते — अलग capitalisation, अतिरिक्त spaces, tabs बनाम spaces, blank lines, या Windows बनाम Unix line endings। आप ignore case, ignore whitespace, ignore empty lines, trim trailing spaces और ignore line endings चुन सकते हैं, और Unicode को normalise कर सकते हैं ताकि दिखने में एक जैसे characters समान माने जाएँ। इन switches से आप शोर छाँटकर केवल वही अंतर देखते हैं जो सचमुच मायने रखते हैं — reformatted code या किसी अलग editor से दोबारा सहेजे documents की तुलना करते समय बेहद उपयोगी। दोनों editors में line numbers, वैकल्पिक word-wrap, बड़े files के लिए fullscreen mode, और एक-क्लिक file import है।
Developers के लिए, टूल आपकी भाषा बोलता है। unified-patch export वही --- / +++ / @@ format बनाता है जो Git और patch उपयोग करते हैं, code review में लगाने या कहीं और apply करने के लिए तैयार। एक वैकल्पिक lightweight syntax highlighter side-by-side view में strings, comments, numbers और keywords को रंगता है, जिससे code diffs पढ़ने में आसान होते हैं — बिना किसी भारी dependency के। आप नतीजे को self-contained HTML report, Markdown diff block, structured JSON, या PDF के रूप में export कर सकते हैं, और highlighted output को एक क्लिक में copy कर सकते हैं। Live compare टाइप करते ही नतीजा update करता है, एक search box diff में matches highlight करता है, swap दोनों पक्ष बदल देता है, और आपके drafts locally auto-save होते हैं।
Privacy और performance मूलभूत हैं। दोनों texts आपके अपने device पर JavaScript से compare होते हैं; आप जो paste करते हैं, जो file load करते हैं या जो नतीजा बनाते हैं वह किसी server पर upload नहीं होता, और कोई account, login या tracking नहीं। जब सामग्री गोपनीय हो — legal documents, proprietary source code, medical data या unreleased content — तब यह बेहद महत्वपूर्ण है, क्योंकि आपका text भेजने वाला diff tool एक गंभीर leak होगा। सारा processing local होने के कारण, बड़े inputs के लिए भी comparisons तेज़ हैं, और page load होने के बाद टूल बिना इंटरनेट भी काम करता है।
अंत में, टूल accessibility, responsiveness और maintainability के आधुनिक मानकों पर बना है। Controls keyboard से चलते हैं और screen readers के लिए labelled हैं, focus outlines दिखते हैं, और high-contrast वरीयता का सम्मान होता है; result क्षेत्र एक focusable region है ताकि keyboard users उसे आसानी से scroll व search कर सकें। Layout बड़े desktop से — जहाँ दोनों editors और side-by-side view आराम से साथ बैठते हैं — tablets और phones तक ढलता है, जहाँ वे touch-friendly controls के साथ साफ़-सुथरे stack होते हैं। भीतर से, diff modes, view renderers, options और export formats छोटे, सुपरिभाषित functions में व्यवस्थित हैं, इसलिए टूल सटीक, audit करने में आसान और विस्तार करने में सरल है।
| Mode | What it compares | Best for |
|---|---|---|
| Word | Word-by-word differences. | Prose, articles, edited documents. |
| Line | Whole-line additions and removals. | Source code and config files. |
| Character | Every single character. | Tiny edits, IDs, hashes. |
| Sentence | Sentence-level changes. | Copywriting and translations. |
| Paragraph | Block/paragraph changes. | Long-form content and drafts. |
| Inline view | One flow with green/red marks. | Quick reading of changes. |
| Side-by-side view | Two aligned columns. | Detailed review of code. |
| Unified view | Git-style +/− patch. | Pull requests and patches. |
Import either side directly from a file. Because the tool compares plain text, it works with any text-based format, including:
Export the comparison as HTML, Markdown, JSON, a unified patch, or print it to PDF.
Works on all modern browsers — Google Chrome, Mozilla Firefox, Microsoft Edge, Safari, Opera and Brave — on Windows, macOS, Linux, Android and iOS. It needs JavaScript enabled, with no plugins or installation. File import uses the standard File API, copy uses the Clipboard API with a fallback, and exports use standard downloads supported everywhere.