Compare two text documents line by line. See additions, deletions, and unchanged lines in side-by-side or unified diff view. Works entirely in your browser.
Enter the original text to compare.
Enter the modified text to compare.
A unified diff shows changes inline with context lines, using + for additions and - for deletions. This compact format is standard for patches and version control. A side-by-side diff displays the original and modified texts in adjacent panes with aligned lines, making it easier to visually scan changes and understand context. This tool provides the side-by-side view with synchronized scrolling for optimal comparison.
In the side-by-side diff view, green highlights indicate added content (lines or inline changes present in the modified text but not the original), red highlights indicate removed content (present in the original but not the modified), and plain text represents unchanged lines shared by both inputs. This color convention is universal across diff tools and version control systems.
Text Diff is a browser-based developer tool that highlights differences between two blocks of text or source code. Whether you are reviewing a pull request, debugging a configuration file, or verifying edits before deployment, Text Diff surfaces additions, deletions, and modifications at a glance without requiring heavy desktop software or account registration.
Because it runs entirely in the browser, your input never leaves your machine, making it safe for quick checks on proprietary code, environment variables, and internal logs. There is nothing to install, no server round-trip, and no data retained after you close the tab.
Compare JSON or YAML configuration files across staging and production to catch missing keys or mismatched values before a release breaks production.
Review source code changes between feature branches and main to confirm that only intended logic reached the build.
Validate log file differences after a server update to isolate new errors introduced by a recent patch.
Check documentation drafts against published versions so technical writers can verify every edit landed correctly.
Audit environment variable lists to spot duplicated keys, accidental removals, or secret exposure during infrastructure changes.
Compare minified and unminified asset output to confirm build pipelines are producing the expected transformations.
Diff API response bodies side by side to detect schema drift between service versions without writing custom comparison scripts.
Text Diff works as a lightweight companion to version control, giving developers a fast, private way to compare text anytime without installing additional tooling.
Use it during code reviews, incident triage, or release preparation to catch unintended changes before they reach your users.
It is especially useful for distributed teams who need a shared, zero-setup way to validate edits across time zones without coordinating local environment setup.
Add Text Diff to your daily workflow and spend less time hunting down changed lines and more time shipping reliable code.
