Compare · Highlight · Edit
Text Comparison Tool
Updated: June 2026
A text comparison tool answers one deceptively hard question: what is different between these two pieces of writing? Reading both versions and trusting your memory is slow and unreliable. Letting an algorithm align the text and colour the changes is instant and exact.
Free · No upload · Word & character level
Why eyeballing it fails
Human attention is poor at this task. When two paragraphs are 95% identical, the matching parts lull your eye into skimming, and the one changed word — a flipped negative, a wrong figure, a different name — slips through. This is exactly how typos survive proofreading and how a critical edit gets lost between drafts.
A comparison tool removes the guesswork. It aligns the shared text so the unchanged parts recede into neutral colour, and it lights up only what actually moved. You are no longer searching; you are reading a report that points directly at every change.
Word, character and line views
Different comparisons need different precision, so the tool offers three levels of detail:
| Granularity | Best for |
|---|---|
| Word | Prose, essays, marketing copy, contracts — reads naturally |
| Character | Codes, IDs, numbers, URLs — catches a single changed digit |
| Line only | Structured lists where whole lines are added or removed |
In word mode an edited sentence shows the old wording struck through in red and the new wording in green, with the unchanged words left alone. In character mode the highlight tightens down to individual letters, which is the right choice when a one-character mistake matters.
Controlling what counts as a difference
Not every difference is meaningful. If you only care about the words and not the formatting, the ignore options let you say so:
- Ignore case treats "Total" and "total" as the same word.
- Ignore all whitespace hides changes in spacing and indentation entirely.
- Ignore trailing spaces drops stray spaces at the ends of lines.
- Ignore blank lines skips empty lines so only content counts.
Crucially, these settings affect the comparison only — the text you see is always the original, untouched. You decide how strict the diff should be without ever altering your content.
Who uses it
Writers and editors compare drafts to see what a reviewer changed. Translators check that a revised localisation matches the source structure. Lawyers and contract managers spot altered clauses between two versions of an agreement. Students confirm their final edit actually contains the corrections they made. Support and QA teams compare expected versus actual output. In every case the tool turns a tedious manual check into a glance.
And because the whole comparison runs locally in your browser, none of that text — drafts, contracts, private notes — is ever sent to a server. It is free, unlimited, and as private as a tool gets.
Frequently asked questions
What is a text comparison tool?
It is a tool that takes two pieces of text and visually marks what differs between them, so you can see edits, insertions and deletions without reading both versions in full.
Can it compare two paragraphs word by word?
Yes. With word granularity the tool highlights only the words that changed inside each line, which is ideal for prose and editing.
Does it cost anything?
No. The text comparison tool is free, unlimited and runs entirely in your browser with no sign-up.