How to Compare Two Texts and Find the Differences

Compare two texts without missing a single change

You have two versions of the same thing — a draft and an edited draft, an old config and a new one, a contract before and after redlines — and you need to know exactly what changed. Reading both side by side and trusting your eyes is slow and error-prone. A diff tool does the comparison for you: it lines the two texts up, highlights every added, removed, and modified piece, and tells you how similar they are.

The fastest way to compare two texts is the Text Compare tool. Paste both versions, and it shows the differences down to the individual character. It's handy for proofreading edits, reviewing copy changes, checking translations against an original, or diffing configuration files. The whole thing runs in your browser — your text never leaves your device, there's no upload step, and no sign-up.

How to compare two texts

1. Open the tool. Go to Text Compare. You'll see two input panels: Original Text on the left and Modified Text on the right.

2. Add your first version. Paste your original text into the left panel. If it's in a file, click Upload above that panel (or drag and drop the file onto it) — .txt, .md, .json, code files, .csv, and more are accepted.

3. Add your second version. Paste or upload the edited version into the right Modified Text panel. The comparison runs automatically as you type or paste — there's no "compare" button to hit.

4. Read the highlighted result. Removed content appears in red on the original side, added content in green on the modified side, and changed lines show both. By default the tool does a character-level diff, so inside a modified line only the exact characters that changed are highlighted.

5. Pick a view that fits. Use the Split tab to see Original and Modified side by side, or Unified to see one combined stream with - and + markers (the format you'll recognize from code reviews).

6. Choose how granular to go. The diff level selector offers Character, Word, or Line. Character is precise; Word is easier to read for prose; Line is best when you only care which whole lines changed.

7. Jump between changes. When there are differences, use the up/down change navigator (or Alt+Up / Alt+Down) to step through each one. The counter shows your position, like "3 / 12", so you don't lose track.

8. Check the summary. The tool reports added, removed, modified, and unchanged counts, plus a similarity percentage and line/word/character totals for each side — a quick way to gauge how big the change set is.

9. Save or share the result. Click Copy to put the diff on your clipboard, or export it as a unified diff, a .patch file, or a standalone HTML report you can send to someone else.

That's the core workflow. From here, the ignore options and merge feature below handle the trickier cases.

Tips

• Texts identical but the tool shows differences? It's almost always invisible whitespace or case. Turn on Ignore Whitespace to collapse spacing and tab differences, and Ignore Case to treat "Hello" and "hello" as the same. There are also Ignore Blank Lines and Ignore Comments toggles for code.
• Pasted them in the wrong boxes? Click Swap to flip Original and Modified instead of re-pasting.
• Wall of unchanged lines burying the changes? Enable fold unchanged to collapse long matching sections and keep only a few lines of context around each change.
• Comparing two JSON blobs? The tool auto-detects JSON and pretty-prints both sides first, so formatting differences don't drown out real value changes.
• Want to build one merged version? Open the merge panel to accept or reject each change individually and copy out a combined result. For a dedicated workflow around that, the Text Diff and Merge tool is built specifically for resolving differences into a single output.
• Diffing source code? The Diff Checker under code tools is tuned for that and produces the same kind of side-by-side and unified output.

Common problems

• Long lines wrap and look messy. That's expected — the tool wraps rather than truncating so nothing is hidden. Switch the diff level to Line if you only need to know which lines differ, not the inner detail.
• The result feels noisy. A character-level diff flags every tiny change. Switch to Word level for prose; it groups changes into whole words and reads much more naturally.
• Duplicate lines confuse the comparison. If one or both texts have repeated lines that shouldn't be there, clean them first with Remove Duplicate Lines, then compare the tidied versions.

FAQ

Is my text uploaded to a server? No. Text Compare runs entirely in your browser. Your text — including anything you "upload" or drag in — is read and compared locally and never sent anywhere. There's no account or sign-up.

What's the difference between character, word, and line diff? They control how finely the tool reports changes within a modified line. Character highlights the exact letters that changed, word highlights whole changed words, and line just marks the whole line as different. Use character for precision, word for readable prose, line for a high-level overview.

Why do two texts that look identical show as different? Usually trailing spaces, tabs versus spaces, different line endings, or capitalization. Enable Ignore Whitespace and Ignore Case to rule those out. If the similarity then jumps to 100%, that was the cause.

Can I save a comparison to share? Yes. Export an HTML report, a unified diff, or a .patch file, or just copy the diff text. The tool also keeps a local history of recent comparisons in your browser so you can reload them.

Working with text a lot? Pair this with Text Compare for spotting changes and tools like Remove Duplicate Lines and the Text Diff and Merge tool to clean up and combine the results.