Side-by-side comparison
Paste your original text and your changed text and compare them together.
🔍
Text Diff Checker
See exactly what changed between two blocks of text.
🔒 Enterprise privacy — 100% client-side, no server uploads
What is Text Diff Checker?
Text Diff Checker is a free online tool that lets you see exactly what changed between two blocks of text. It works in your web browser with no signup. Enter your text or numbers and see the result instantly. Everything you type stays in your browser.
Also searched as: compare two texts, text compare online, find differences between texts, diff checker.
Text Diff Checker at a glance
- Price
- Free, with no paid plans
- Account
- No signup or login needed
- Where it runs
- In your web browser
- Your data
- Nothing you type is sent to a server
- Works on
- Any modern browser, on desktop and mobile
- Category
- Clean Text & Structure Data
When to use Text Diff Checker
- →See what changed between two drafts
- →Compare two versions of code or config
- →Check a contract revision for edits
How to use Text Diff Checker
- 1
Open Text Diff Checker and paste or type your text into the input box.
- 2
Your result updates instantly as you type — no button to click.
- 3
Adjust any mode or format options shown above the result, if the tool offers them.
- 4
Copy the output with one click, or leave it in place to keep editing.
Why use Text Diff Checker
- ✓Runs entirely in your browser — your file is never uploaded to a server.
- ✓No account, signup, or email address required to use it.
- ✓Completely free, with no daily limit and no signup.
- ✓Updates the result instantly as you type, so you can see changes in real time.
Text Diff Checker
See exactly what changed between two texts
Paste the original on one side and the changed text on the other. Differences are marked line by line, with a count of how many lines differ.
Colour-coded lines
Red marks text that is only in the original and green marks text that is only in the changed version.
A clear count
You are told how many lines differ, or that the two texts are identical.
Private
Your texts stay in your browser and are not uploaded.
Instant
Results update as you type or paste.
Free, no signup
No account and no limit.
Everything you need in Text Diff Checker
- Compare two blocks of text
- Differences shown line by line
- Red for original-only, green for changed-only
- Count of differing lines
- Works for drafts, code and lists
- Runs in your browser
- Works on phone and computer
- Free and no signup
Tips for better results
- 1
Compare like with like
Paste both versions in full so line numbers line up and you see real changes.
- 2
Watch invisible changes
A trailing space or a different line ending can count as a change.
- 3
Good for drafts
Use it to check what an editor changed in a document or what changed in a config file.
0files uploaded
0signups needed
0cost to use
Tutorials on Text Diff Checker
Short, practical guides that go with this tool.
🔒 Your privacy with Text Diff Checker
Text Diff Checker runs as client-side JavaScript inside your own browser tab. Your file or text is read, processed, and turned into a result on your device — it is never sent to, stored on, or seen by Toolkitties' servers. Closing or refreshing the page clears everything.
Frequently asked questions
How does the Text Diff Checker compare texts?
It compares the two texts line by line and marks the lines that differ.
What do the colours mean?
Red is text that appears only in the original. Green is text that appears only in the changed version.
Can it compare two files?
Paste the contents of the files into the two boxes. The tool compares the text you paste.
Why does it show a change when I see none?
There may be extra spaces, a different capital letter or a different line ending that is hard to see.
Is my text uploaded?
No. The comparison happens in your browser.
Can I use it for code?
Yes. It compares any text, including code and configuration files, line by line.
Is Text Diff Checker free to use?
Yes. Text Diff Checker is 100% free, with no signup, no daily limit and no paid plans.
Do I need to create an account to use Text Diff Checker?
No signup or login is required. Open the page and start using Text Diff Checker immediately.
Is it safe to use Text Diff Checker with private or sensitive files?
Yes. Text Diff Checker processes your file locally in your browser using client-side code. The file itself is never uploaded to Toolkitties' servers.
Does Text Diff Checker store the text I enter?
No. Your text is processed in memory in your browser tab and is cleared as soon as you close or refresh the page.