Guides
Practical guides to file comparison, diff tools, and document workflows — written for developers, legal teams, writers, and analysts.
How to Compare Two PDF Files Online
A step-by-step guide to comparing PDF documents in your browser — no software installation, no Microsoft Word required.
git diff vs. an Online Diff Tool: When to Use Which
Both git diff and browser-based diff tools highlight code changes — but they serve different purposes. Here is how to choose.
Diff Algorithms Explained: Myers, Patience, and Histogram
What actually happens when a diff tool compares two files? A plain-English guide to the three most common diff algorithms and when each one produces better results.
How to Track Changes in Word Documents Without Microsoft Word
You do not need Microsoft Word to see what changed between two document versions. Here are the fastest ways to compare Word files and PDFs online.
How to Compare Two Images Online: A Visual QA Guide
A practical guide to pixel-level image comparison — what the different viewing modes mean, when to use each one, and common workflows for designers, developers, and QA teams.
How to Compare Two ZIP Archives and Folder Structures Online
A guide to comparing the contents of two ZIP files or folder snapshots — understanding which files were added, removed, or changed, and seeing the line-level diffs inside each file.
How to Compare Two Excel Files: VLOOKUP vs. a Diff Tool
VLOOKUP can find matching values but it cannot tell you what changed. Here is how a dedicated diff tool compares to Excel's built-in options for spotting differences between two spreadsheets.