Text & data
Compare two texts
Paste or open the original and the changed version. The lines that differ appear as you type: removed words struck out, added words marked, each with its line number.
Try it here, no account neededSave and continue on the desktop
Download or copy your result here first. Open the free desktop to save to Files or use more features.
- Quick notes in a stream, or titled notes
- Save to Files when you continue on the desktop
- Every tool in one place, no new tabs
After you download, continue on the desktop for Files or the full app.
What Diff Checker can do
Words, not whole lines
Many diff tools mark a whole line as changed when one word in it moved. Here the unit is the word, and punctuation on its own: a changed date shows as one number out and one in, and a comma that became a semicolon shows as just that. Lines that did not change are not shown, so a long contract with two edits is two lines on screen.
Spacing is not a change
Double spaces, tabs and a paragraph that wraps onto different lines in the two versions are ignored: only the words and their order are compared. Text pasted from a PDF, an email and a word processor usually differs in exactly those ways, and a diff full of them hides the edit you are looking for.
Nothing leaves the page
Both texts are compared in your browser tab; nopa has no server that could receive them. That matters for what people compare most: drafts of contracts and policies, code, configuration with keys in it. Download report saves the changes as an HTML file that opens in any browser.
Related apps
Questions
Is there a size limit?
No fixed one: long texts compare in about a second on a laptop. Two long stretches that have almost nothing in common are shown as replaced in whole rather than word by word.
Can I compare two files?
Yes: Open file above each field reads a Word document (.docx), a PDF or a text file, and two files dropped on the page fill both fields. For two PDFs, Compare PDF shows the same differences with page numbers.
Is it case-sensitive?
Yes. «Contract» and «contract» are different words here, because a changed capital letter is a change worth seeing in a document.
Does it work for code?
Yes, with one difference from a code diff: indentation is ignored. A renamed variable, a changed number or a moved bracket is marked exactly.
Is my text uploaded?
No. The comparison runs in this tab and nothing is sent anywhere.