Free

Diff Tool

Diff Tool compares two text blocks and highlights added, removed, and unchanged lines with color-coded output. Unified (Git-style) and side-by-side views, with optional ignore-whitespace and ignore-case toggles. Useful for verifying edits, comparing config files, or spot-checking API responses.

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Comparing two versions of text is one of those tasks that comes up constantly — reviewing what changed in a config file, spot-checking two API responses, verifying a string migration didn't break anything. Diff Tool does this cleanly. Paste Text A (original) and Text B (changed) and click Compare. The output shows every line categorized as added (green, marked +), removed (red, marked −), or unchanged. Switch between unified view (Git-style, everything stacked) and side-by-side view (two columns with line pairing). The diff uses a longest-common-subsequence algorithm so the alignment is optimal, not line-by-line naive. Ignore-whitespace and ignore-case toggles help when the real changes are hidden under formatting noise. Stats at the top show total added/removed/unchanged counts for an at-a-glance summary.

Live forhåndsvisning

example.com

Diff Tool +3 added −2 removed 5 unchanged

Unified Side-by-side

                        1
                        1
                         
                        function greet(name) {
                    
                        2
                        
                        −
                          console.log("Hi " + name);
                    
                        2
                        +
                          console.log(`Hello, ${name}!`);
                    
                        3
                        +
                          console.log(`Welcome back.`);
                    
                        3
                        4
                         
                        }
                    
                        4
                        5
                         
                        5
                        
                        −
                        greet("world");
                    
                        6
                        +
                        greet("Alice");
                    
                        6
                        7
                         
                        greet("Bob");

Hovedfunksjoner

Line-Level Diff

Categorizes every line as added, removed, or unchanged using a longest-common-subsequence algorithm for optimal alignment.

Unified & Side-by-Side Views

Switch between Git-style unified (everything stacked) and side-by-side (two columns) layouts depending on what's easier to read.

Color-Coded Output

Added lines highlight green with + marker; removed lines highlight red with − marker; unchanged lines are neutral. Quick visual scanning.

Ignore Whitespace / Case

Toggles let you ignore trivial formatting differences so you can focus on meaningful changes.

Diff Statistics

Top bar shows "+N added −N removed N unchanged" counts — quick summary without scanning every line.

Fast for Realistic Inputs

Handles thousands of lines in milliseconds. Large inputs are bounded to keep the UI responsive.

Vanlige bruksområder

Reviewing Edits Before Saving

Before overwriting a file, paste the old and new versions to confirm only the intended changes are in the new one — no accidental deletions.

Comparing API Responses

Capture a response before and after a fix, diff the two payloads, and verify your change only touched what it was supposed to.

Config File Diffing

Compare two environment configs (dev vs prod, old vs new) to spot drift that might cause subtle bugs.

Verifying Formatted Output

Run a formatter on a file and diff input vs output to confirm only whitespace/formatting changed — no semantic drift.

Spot-Checking Text Migrations

When updating copy across a page or document, diff old and new to verify every translation landed correctly.

Slik bruker du det

Open Diff Tool

Click the Diff icon in the DevSuite Pro dock. A panel opens with two text areas side by side.

Paste Text A and Text B

Paste the original version in Text A and the changed version in Text B. Any text works — code, JSON, logs, prose.

Toggle Options

Enable Ignore whitespace or Ignore case if formatting/casing changes are noise you want to skip.

Click Compare

Press Compare. The diff renders below with color-coded added/removed/unchanged lines and stats at the top.

Switch Views (optional)

Flip between Unified and Side-by-side views. Unified is more compact, side-by-side makes pair alignment obvious.