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Text Comparison Tool

Compare two texts instantly to find added, removed, and changed words, characters, and lines. Review highlighted differences, check text statistics, and export your results for free.

0 characters · 0 words · 0 lines
0 characters · 0 words · 0 lines
Clean up:
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Text Comparison Report

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Mode' + esc(modeLabel(R.mode)) + '
Similarity' + (R.stats.sim === null ? 'n/a' : R.stats.sim.toFixed(2) + '%') + '
Added units' + R.stats.added + '
Removed units' + R.stats.removed + '
Unchanged units' + R.stats.equal + '
Changed sections' + R.stats.hunks + '
Original size' + R.stats.aChars + ' chars / ' + R.stats.aWords + ' words / ' + R.stats.aLines + ' lines
Modified size' + R.stats.bChars + ' chars / ' + R.stats.bWords + ' words / ' + R.stats.bLines + ' lines
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Original text

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Modified text

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Differences

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No differences detected.
'); for (var i = 0; i < R.hunks.length; i++) { var hk = R.hunks[i]; parts.push('
#' + (i + 1) + ' · ' + esc(describeHunk(hk, R)) + '
'); for (var d = 0; d < hk.dels.length; d++) parts.push('- ' + esc(R.ta[hk.dels[d]].raw) + ''); for (var a = 0; a < hk.inss.length; a++) parts.push('+ ' + esc(R.tb[hk.inss[a]].raw) + ''); parts.push('
'); } parts.push(''); return parts.join('\n'); } /* ================================================================== FILE HANDLING ================================================================== */ var MAX_FILE = 5 * 1024 * 1024; function wireFile(inputId, clearBtnId, nameId, taId) { on($(inputId), 'change', function () { var f = this.files && this.files[0]; if (!f) return; if (f.size > MAX_FILE) { setStatus('The file "' + f.name + '" is ' + (f.size / 1048576).toFixed(1) + ' MB. Files larger than 5 MB are not supported.', 'err'); this.value = ''; return; } var reader = new FileReader(); reader.onerror = function () { setStatus('Could not read the file "' + f.name + '". Please try another file.', 'err'); }; reader.onload = function () { $(taId).value = String(reader.result || ''); $(nameId).textContent = f.name + ' · ' + (f.size / 1024).toFixed(1) + ' KB'; $(clearBtnId).hidden = false; updateCounts(); if ($('etcAuto').checked) scheduleCompare(); }; reader.readAsText(f, 'utf-8'); }); on($(clearBtnId), 'click', function () { $(inputId).value = ''; $(nameId).textContent = ''; $(clearBtnId).hidden = true; }); } /* ================================================================== COUNTS ================================================================== */ function updateCounts() { var a = $('etcA').value, b = $('etcB').value; $('etcCountA').textContent = a.length + ' characters · ' + countWords(a) + ' words · ' + countLines(a) + ' lines'; $('etcCountB').textContent = b.length + ' characters · ' + countWords(b) + ' words · ' + countLines(b) + ' lines'; } var autoTimer = null; function scheduleCompare() { if (autoTimer) clearTimeout(autoTimer); autoTimer = setTimeout(function () { autoTimer = null; compare(); }, 600); } /* ================================================================== TEXT CLEANUP ================================================================== */ function cleanText(text, op) { var lines; switch (op) { case 'trimLines': return text.split('\n').map(function (l) { return l.trim(); }).join('\n'); case 'trailWs': return text.split('\n').map(function (l) { return l.replace(/[ \t]+$/, ''); }).join('\n'); case 'leadWs': return text.split('\n').map(function (l) { return l.replace(/^[ \t]+/, ''); }).join('\n'); case 'collapseSpaces': return text.replace(/[ \t]{2,}/g, ' '); case 'dedupeBlank': return text.replace(/\n{3,}/g, '\n\n'); case 'eol': return text.replace(/\r\n?/g, '\n'); case 'lower': return text.toLowerCase(); case 'upper': return text.toUpperCase(); case 'sortLines': lines = text.split('\n'); lines.sort(function (a, b) { return a.localeCompare(b); }); return lines.join('\n'); case 'dedupeLines': lines = text.split('\n'); var seen = new Set(); var out = []; for (var i = 0; i < lines.length; i++) { if (seen.has(lines[i])) continue; seen.add(lines[i]); out.push(lines[i]); } return out.join('\n'); default: return text; } } function applyCleanup(op) { var target = $('etcCleanTarget').value; if (target === 'both' || target === 'a') ('etcA').value=cleanText(('etcA').value, op); if (target === 'both' || target === 'b') ('etcB').value=cleanText(('etcB').value, op); updateCounts(); setStatus('Cleanup applied: "' + op + '" was applied to ' + (target === 'both' ? 'both texts' : (target === 'a' ? 'the original text' : 'the modified text')) + '.', 'info'); if ($('etcAuto').checked) scheduleCompare(); } /* ================================================================== WIRING ================================================================== */ /* Tabs */ var viewButtons = root.querySelectorAll('.etc-views button'); function setView(v, focus) { STATE.view = v; for (var i = 0; i < viewButtons.length; i++) { var b = viewButtons[i]; var sel = b.getAttribute('data-view') === v; b.setAttribute('aria-selected', sel ? 'true' : 'false'); if (focus && sel) b.focus(); } $('etcLayout').value = v; if (STATE.result) { renderOutput(STATE.result); collectHunks(); updateNav(); if ($('etcSearch').value) doSearch(); } } for (var vb = 0; vb < viewButtons.length; vb++) { (function (btn) { on(btn, 'click', function () { setView(btn.getAttribute('data-view')); }); })(viewButtons[vb]); } on($('etcLayout'), 'change', function () { setView(this.value); }); /* Settings toggle */ on($('etcSettingsToggle'), 'click', function () { var panel = $('etcSettings'); var open = panel.hidden; panel.hidden = !open; this.setAttribute('aria-expanded', open ? 'true' : 'false'); this.textContent = open ? 'Settings ▴' : 'Settings ▾'; }); /* Core buttons */ on($('etcCompare'), 'click', compare); on($('etcSwap'), 'click', function () { var a = $('etcA').value; $('etcA').value = $('etcB').value; $('etcB').value = a; var na = $('etcNameA').textContent; $('etcNameA').textContent = $('etcNameB').textContent; $('etcNameB').textContent = na; updateCounts(); compare(); }); on($('etcSample'), 'click', function () { $('etcA').value = SAMPLE_A; $('etcB').value = SAMPLE_B; $('etcNameA').textContent = 'sample-original.txt'; $('etcNameB').textContent = 'sample-modified.txt'; $('etcClearFileA').hidden = false; $('etcClearFileB').hidden = false; updateCounts(); compare(); }); on($('etcClear'), 'click', function () { $('etcA').value = ''; $('etcB').value = ''; $('etcNameA').textContent = ''; $('etcNameB').textContent = ''; $('etcClearFileA').hidden = true; $('etcClearFileB').hidden = true; $('etcFileA').value = ''; $('etcFileB').value = ''; STATE.result = null; STATE.job++; $('etcResults').hidden = true; updateCounts(); setStatus('Both text fields were cleared.', 'info'); }); on($('etcReset'), 'click', function () { $('etcA').value = ''; $('etcB').value = ''; $('etcNameA').textContent = ''; $('etcNameB').textContent = ''; $('etcClearFileA').hidden = true; $('etcClearFileB').hidden = true; $('etcFileA').value = ''; $('etcFileB').value = ''; $('etcAuto').checked = false; $('etcMode').value = 'auto'; $('etcLayout').value = 'side'; $('etcCase').checked = false; $('etcTrimLine').checked = true; $('etcCollapseWs').checked = false; $('etcLeadTrail').checked = false; $('etcEol').checked = true; $('etcBlank').checked = false; $('etcPunct').checked = false; $('etcNums').checked = false; $('etcWsOnly').checked = false; $('etcUnicode').checked = true; $('etcShowUnch').checked = true; $('etcCollapseEq').checked = true; $('etcLineNums').checked = true; $('etcInlineHl').checked = true; $('etcWsMark').checked = false; $('etcRangeA1').value = ''; $('etcRangeA2').value = ''; $('etcRangeB1').value = ''; $('etcRangeB2').value = ''; $('etcCleanTarget').value = 'both'; $('etcSearch').value = ''; $('etcSearchInfo').textContent = ''; STATE.result = null; STATE.job++; STATE.hunkIndex = -1; STATE.expandAll = false; $('etcResults').hidden = true; updateCounts(); setStatus('The tool has been reset to its default state.', 'info'); }); on($('etcA'), 'input', function () { updateCounts(); if ($('etcAuto').checked) scheduleCompare(); }); on($('etcB'), 'input', function () { updateCounts(); if ($('etcAuto').checked) scheduleCompare(); }); /* Re-run on settings change */ var settingIds = ['etcMode', 'etcCase', 'etcTrimLine', 'etcCollapseWs', 'etcLeadTrail', 'etcEol', 'etcBlank', 'etcPunct', 'etcNums', 'etcWsOnly', 'etcUnicode', 'etcRangeA1', 'etcRangeA2', 'etcRangeB1', 'etcRangeB2']; for (var si = 0; si < settingIds.length; si++) { (function (id) { on($(id), 'change', function () { if (STATE.result || $('etcA').value || $('etcB').value) compare(); }); })(settingIds[si]); } /* Display-only settings: just re-render */ var renderIds = ['etcShowUnch', 'etcCollapseEq', 'etcLineNums', 'etcInlineHl', 'etcWsMark']; for (var ri = 0; ri < renderIds.length; ri++) { (function (id) { on($(id), 'change', function () { if (!STATE.result) return; STATE.result.settings = readSettings(); STATE.expandAll = false; renderAll(); if ($('etcSearch').value) doSearch(); }); })(renderIds[ri]); } /* Navigation */ on($('etcPrev'), 'click', function () { goHunk(-1); }); on($('etcNext'), 'click', function () { goHunk(1); }); on($('etcExpandAll'), 'click', function () { if (!STATE.result) return; STATE.expandAll = true; renderOutput(STATE.result); collectHunks(); updateNav(); }); on($('etcCollapseAll'), 'click', function () { if (!STATE.result) return; STATE.expandAll = false; renderOutput(STATE.result); collectHunks(); updateNav(); }); /* Search */ var searchTimer = null; on($('etcSearch'), 'input', function () { if (searchTimer) clearTimeout(searchTimer); searchTimer = setTimeout(function () { searchTimer = null; doSearch(); }, 300); }); on($('etcSearchNext'), 'click', function () { gotoMark(1); }); on($('etcSearchPrev'), 'click', function () { gotoMark(-1); }); /* Cleanup */ var cleanBtns = root.querySelectorAll('[data-clean]'); for (var cb = 0; cb < cleanBtns.length; cb++) { (function (btn) { on(btn, 'click', function () { applyCleanup(btn.getAttribute('data-clean')); }); })(cleanBtns[cb]); } /* Files */ wireFile('etcFileA', 'etcClearFileA', 'etcNameA', 'etcA'); wireFile('etcFileB', 'etcClearFileB', 'etcNameB', 'etcB'); /* Exports */ function currentResult() { if (!STATE.result) { setStatus('Run a comparison first, then export the results.', 'warn'); return null; } return STATE.result; } on($('etcCopyA'), 'click', function () { copyText($('etcA').value, this); }); on($('etcCopyB'), 'click', function () { copyText($('etcB').value, this); }); on($('etcCopyDiff'), 'click', function () { var R = currentResult(); if (!R) return; copyText(buildUnified(R), this); }); on($('etcCopySum'), 'click', function () { var R = currentResult(); if (!R) return; copyText(buildSummaryText(R), this); }); on($('etcDlA'), 'click', function () { download($('etcA').value, 'original.txt'); }); on($('etcDlB'), 'click', function () { download($('etcB').value, 'modified.txt'); }); on($('etcDlDiff'), 'click', function () { var R = currentResult(); if (!R) return; download(buildUnified(R), 'unified-diff.txt'); }); on($('etcDlSbs'), 'click', function () { var R = currentResult(); if (!R) return; download(buildSideReport(R), 'side-by-side-report.txt'); }); on($('etcDlJson'), 'click', function () { var R = currentResult(); if (!R) return; download(buildJson(R), 'comparison-report.json'); }); on($('etcDlHtml'), 'click', function () { var R = currentResult(); if (!R) return; download(buildHtml(R), 'comparison-report.html'); }); /* ================================================================== INIT ================================================================== */ updateCounts(); setStatus('Paste or type text into both fields, then select Compare Text. Everything runs locally in your browser — your text is never uploaded.', 'info'); })();
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A Text Comparison Tool helps you compare two versions of text and identify what has changed. Whether you are checking edited content, reviewing code, comparing document drafts, or verifying updated information, a text comparer makes additions and deletions easier to spot. Instead of reading both versions repeatedly, you can examine the differences and focus on the sections that need attention.

What Is a Text Comparison Tool?

A Text Comparison Tool, also known as a text diff tool or text difference checker, compares two blocks of text to identify matching content and changes. It can help reveal words that have been added, sentences that have been removed, modified phrases, and differences in punctuation or formatting.

For example, you might compare an original article with its edited version to check what an editor changed. Developers can compare two code snippets to investigate an unexpected modification, while students and professionals can compare drafts to review revisions.

The comparison process is commonly called a diff. Depending on the tool and its comparison settings, differences can be displayed line by line, word by word, or character by character. Highlighting makes it easier to understand how the two versions differ without manually checking every sentence.

Important: A text comparison tool identifies differences between the supplied text. It does not automatically determine whether a change is correct, improve writing quality, or establish whether content was plagiarized.

What Does a Text Comparison Tool Do?

A text comparison tool analyzes two inputs and presents their differences in a readable format. Depending on the features available, it can help with the following tasks:

  • Find added text: Identify words, sentences, or lines that appear in the second version but not in the original.
  • Find removed text: Locate content that was present in the original but is missing from the revised version.
  • Highlight modified content: Examine changed words, phrases, numbers, punctuation, or code statements.
  • Compare matching sections: Identify unchanged passages to provide context around edited sections.
  • Review formatting differences: Detect changes involving spaces, line breaks, indentation, or capitalization when the comparison settings account for them.
  • Support document review: Check revised articles, reports, configuration files, email drafts, and other plain-text content.

The exact features depend on the tool. Some provide only a basic side-by-side comparison, while others offer inline highlighting, comparison modes, change counts, or downloadable difference reports.

How to Compare Two Texts

Comparing two text versions is straightforward. Follow these steps to review changes and identify differences efficiently.

1. Prepare the original text

Copy the original version into the first text field. This is the version you want to use as your reference. It could be an earlier article draft, an existing code snippet, a previous policy, or the original content of a document.

2. Add the revised text

Paste the updated version into the second text field. Make sure you have copied the complete text you want to compare. Missing paragraphs or incomplete snippets can produce results that do not reflect the intended comparison.

3. Run the comparison

Use the comparison button or automatic comparison feature provided by the tool. The tool analyzes the two inputs and displays the differences according to its supported comparison method.

4. Review additions and deletions

Look for highlighted sections that indicate added, removed, or changed content. Many diff tools use green for additions and red for deletions, although colors and indicators vary. Read the surrounding text to understand how each modification affects the meaning.

5. Check small differences carefully

Pay attention to numbers, dates, punctuation, capitalization, URLs, and words such as "not." A minor edit can change the meaning of a sentence, alter a configuration value, or introduce an error into a piece of code.

6. Save or apply the changes

Once you have reviewed the comparison, use the output to update your working document or investigate the relevant changes. If your tool supports copying or exporting the comparison, save a report when you need a record of the differences.

Types of Text Comparison

Text can be compared at different levels of detail. Choosing the appropriate method makes the output easier to interpret, especially when reviewing longer documents or technical files.

Comparison mode How it works Best use
Line-by-line Compares lines of text to identify inserted, removed, or changed lines. Source code, configuration files, logs, and structured text.
Word-by-word Highlights individual words or word sequences that differ between versions. Articles, reports, email drafts, and document editing.
Character-by-character Identifies differences at the character level, including small spelling and punctuation changes. Proofreading, identifiers, URLs, numbers, and short strings.
Side-by-side Displays the original and revised text in separate, aligned areas when supported. Reading both versions while reviewing larger edits.
Inline diff Shows additions and removals within a combined comparison view. Reviewing sentence-level edits and compact differences.

Line-level comparison is often easier for code, while word-level comparison is usually more readable for prose. Character-level comparison can reveal tiny edits that are otherwise easy to overlook.

Common Uses of a Text Comparison Tool

A text comparison tool can be useful in writing, editing, software development, research, and routine document management.

Content writing and editing

Writers and editors can compare article drafts to see whether headings, paragraphs, claims, or keywords have changed. It is useful for checking editorial revisions, reviewing a client's edits, and confirming that important details remain intact after rewriting.

SEO content quality checks

SEO professionals can compare original and updated website copy to inspect changes to headings, page descriptions, product details, internal link text, or other content elements. Comparing drafts can also help confirm whether requested revisions were applied correctly.

Code review and debugging

Developers can compare source code, configuration files, scripts, and plain-text logs to identify modifications. A diff can reveal a changed variable, missing statement, altered setting, or unexpected line break that may explain a problem.

Document and contract review

Professionals can compare two versions of a policy, proposal, agreement, or report to locate changes before approving a revision. Important wording and numerical changes can be easier to review when the differences are highlighted.

For legal or high-stakes documents, use the comparison as an aid rather than a substitute for careful review. Verify the full context of every significant change.

Academic work and proofreading

Students, researchers, and proofreaders can compare drafts to locate revisions, check corrected errors, and confirm that feedback has been addressed. A difference report can help with revision tracking, but it does not itself verify the accuracy or originality of the text.

Data and configuration checks

Technical teams can compare text-based configuration values, exported records, API responses, or lists to investigate unexpected changes. For structured formats such as JSON, a dedicated JSON comparison tool may be more appropriate when differences in key order or formatting should be ignored.

Text Comparison Tool vs. Plagiarism Checker

A text comparison tool and a plagiarism checker serve different purposes. A text comparer looks for differences between two supplied versions. A plagiarism checker typically evaluates submitted content against available reference material or databases to identify possible matches.

Feature Text Comparison Tool Plagiarism Checker
Main purpose Find differences between two versions of text. Identify potential similarities with other material.
Input Usually two text blocks or two supported files. Usually one document or text submission.
Typical output Added, removed, unchanged, or modified content. Matched passages, similarity indicators, or source references, depending on the service.
Common use Revision tracking, proofreading, debugging, and content review. Checking potential text overlap and investigating source attribution.

A text comparison tool cannot establish plagiarism simply by comparing two supplied versions. Likewise, a similarity score from a plagiarism checker does not automatically prove misconduct. Each result requires context and appropriate interpretation.

Why Text Comparison Results Can Be Different

A comparison may flag changes that are not immediately obvious or display a larger difference than expected. Several factors can influence the results.

Whitespace and line breaks

Extra spaces, tabs, or different line breaks may count as changes when the tool compares exact text. If these differences are irrelevant to your task, use an ignore-whitespace option if the tool provides one. Keep whitespace significant when reviewing code or data where formatting affects interpretation.

Capitalization and punctuation

A change from uppercase to lowercase or the addition of a comma can be reported as a difference. These edits may be minor in some documents but significant in identifiers, code, URLs, or carefully worded statements.

Reordered content

If a paragraph or line is moved, a comparison algorithm may display it as a deletion in one location and an addition in another rather than identifying it as a move. This behavior depends on the algorithm and the structure of the text.

Different comparison settings

Line, word, and character comparison can produce different-looking outputs for the same inputs. Options such as ignoring capitalization or whitespace can also change which differences appear. Choose settings that match the level of detail you need.

Special characters and encoding

Similar-looking characters can have different underlying representations. Unicode characters, typographic quotation marks, hyphens, and other symbols may be flagged even when they look almost identical on screen. Inspect the actual characters when a result appears unexpected.

Tips for More Accurate Text Comparisons

  • Use complete inputs: Include the entire original and revised text rather than unrelated or incomplete excerpts.
  • Keep the versions in the correct order: Clearly identify which input is original and which is updated so additions and removals are interpreted correctly.
  • Select the right comparison level: Use line comparison for code and configuration files, word comparison for prose, and character comparison for small details.
  • Decide whether formatting matters: Preserve whitespace when it is significant and ignore it only when the task calls for doing so.
  • Review the surrounding context: A highlighted phrase might alter the meaning of an entire paragraph or statement.
  • Verify important changes manually: Confirm figures, names, dates, citations, URLs, and technical values before applying modifications.
  • Protect sensitive information: If you are comparing confidential documents, check how the selected tool processes and stores its inputs before using it.

Best practice: Use the comparison output to find changes quickly, then review those changes in context before accepting or publishing the revised text.

Frequently Asked Questions

What is a Text Comparison Tool?

A Text Comparison Tool compares two text versions and identifies changes such as added words, removed sentences, modified lines, and punctuation differences. It helps users review revisions without manually reading both versions in full.

How do I compare two texts online?

Paste the original text into the first input field and the revised version into the second. Run the comparison or wait for the automatic result if supported. Review the highlighted additions, removals, and unchanged sections to understand what changed.

Can a text comparer identify small spelling mistakes?

Yes. A comparison tool can identify spelling, punctuation, or single-character differences when its comparison method detects them. Character-level comparison is particularly useful for short strings, numbers, identifiers, and minor typos.

Can I compare two documents using a text comparison tool?

You can compare the text extracted from two documents using a tool that accepts pasted text. Some tools also support file uploads. Formatting, images, tables, comments, and other document-specific elements may not be included unless the tool explicitly supports them.

What is the difference between a text diff and a text comparison?

Text comparison is the general process of examining two text versions for differences. A text diff is the difference output or method that identifies additions, deletions, and unchanged portions between those versions.

Can I compare source code with a Text Comparison Tool?

Yes. Plain-text code and configuration files can be compared using a text diff tool. Line-by-line comparison is often useful because it helps identify changed statements, inserted lines, deleted sections, and formatting differences. A language-aware code comparison tool may be preferable for more advanced analysis.

Does a text comparison tool detect plagiarism?

Not by itself. A text comparison tool identifies changes between the text versions you provide. Plagiarism checkers use different methods to find potential similarities with other sources. Comparing two drafts does not establish whether content has been copied from elsewhere.

Why does a text comparison show differences when the text looks the same?

The text may contain extra spaces, different line endings, invisible characters, Unicode variations, or formatting differences. Depending on the comparison settings, these can be reported even when the text appears visually identical. Inspect the inputs and adjust available comparison options where appropriate.

Can I compare text without changing the original content?

A comparison normally examines the supplied versions and displays their differences; it does not require you to edit the original text. Keep separate copies of important documents and review the tool's behavior before using any features that overwrite or export content.

Is a Text Comparison Tool useful for SEO?

Yes. SEO professionals can compare page content, article drafts, headings, metadata text, and other revisions to verify requested changes. It can also help investigate content updates, although it does not independently measure ranking impact or determine whether a change improves SEO performance.