Diff Checker
Compare two texts line by line
Free forever — no sign-up, nothing uploaded. Files never leave your device.
Diff Checker
Compare two texts line by line
Drop your file here
or browse from your device
Browse filesdocument.pdf
1.2 MB
report.pdf
860 KB
100% private
Nothing is uploaded — everything runs in your browser.
Free forever
No account or payment required.
No sign-up
Open the tool and start using it right away.
Local processing
Processing time depends on your input and device.
About this tool
Spot added and removed lines between two blocks of text with a clear side-by-side view.
BrainCoder's text diff checker is a powerful online tool that compares two pieces of text side by side and highlights every difference between them. Whether you're reviewing code changes, proofreading a document, or verifying that a translation is accurate, this diff tool makes it effortless to spot additions, deletions, and modifications at a glance. It's an essential utility for developers, writers, and anyone who works with text on a regular basis.
The diff checker processes everything locally in your browser, so sensitive documents, confidential code, and proprietary content never leave your device. There's no need to upload files to a third-party server — just paste your original and modified text, and the tool instantly shows you a color-coded comparison. It works with plain text, code snippets, configuration files, and more.
With its clean side-by-side layout and inline highlighting, BrainCoder's diff tool helps you understand exactly what changed between two versions of any text. Whether you're merging pull requests, tracking document revisions, or simply comparing two versions of a paragraph, this tool delivers fast, accurate, and private text comparison right in your browser.
Key features
Everything you get with Diff Checker — no premium upsell.
Side-by-side text comparison with color-coded differences
Highlights additions, deletions, and modifications clearly
Works with plain text, code, configs, and any text format
Fully client-side — no data ever leaves your browser
Line-by-line and word-level diff detection
Copy diff results for sharing or documentation
How to use Diff Checker
Follow the steps below to use the tool.
- 1
Paste Original Text
Copy your original text and paste it into the left panel of the diff checker. This is the baseline version you want to compare against.
- 2
Paste Modified Text
Copy the modified or updated version of the text and paste it into the right panel.
- 3
Compare and Review
Click the 'Compare' button. The tool highlights differences in green (additions), red (deletions), and yellow (modifications) so you can instantly see what changed.
- 4
Copy or Export Results
Review the diff output and copy the results to your clipboard for documentation, code review notes, or sharing with your team.
Still free, still private — your files never leave your device.
Launch Diff CheckerFrequently asked questions
Quick answers before you launch the tool.
Related tools
Saved you searching — here are similar utilities.