Guides
Step-by-step tutorials for comparing documents, spreadsheets, code and data — every method runs in your browser.
Common JSON Formatting Errors and How to Debug Them
The nine JSON mistakes that break parsers — trailing commas, smart quotes, duplicate keys and more — with broken snippets, fixes, and a fast debug workflow.
2026/08/11
How Text Similarity Is Measured: The Dice Coefficient Explained
How text similarity is actually calculated: the Dice coefficient with a worked example, character vs word vs line measurement, and what a percentage tells you.
2026/08/11
How to Compare Two Columns in Excel: Formulas, Formatting and Online Tools
Compare two Excel columns with simple formulas, COUNTIF and XLOOKUP, conditional formatting, or a free online tool that never uploads your data — step by step.
2026/08/11
How to Compare Two Excel Sheets for Differences (4 Methods)
Four practical ways to find differences between two Excel sheets: side-by-side viewing, comparison formulas, Spreadsheet Compare, and a free private online diff.
2026/08/11
How to Compare Two Lists and Find Duplicates, Intersections and Differences
Find what two lists share, what only one contains, and the merged set without duplicates — using a free local list compare tool, Excel formulas, or a diff.
2026/08/11
How to Compare Two PDF Files Online (No Upload Required)
Four practical ways to see what changed between two PDF files — including a free in-browser comparison that never uploads your documents, so contracts stay private.
2026/08/11
How to Compare Two URLs or Web Pages for Differences
Four practical ways to see what changed between two web pages or URL strings — diff the URLs, the visible text, the HTML source, or pixel-level screenshots.
2026/08/11
How to Compare Two Word Documents (With or Without Microsoft Word)
Four reliable ways to find the differences between two Word documents — using Word's built-in Compare feature, a free online tool that never uploads your files, plain-text diffing, or PDF comparison.
2026/08/11
What Is a Diff? Line, Word and Character Comparison Explained
Learn what a diff really is, how diff algorithms find the smallest set of edits, and when to compare by lines, words or characters — with free private tools.
2026/08/11
Word vs PDF: Key Differences and How to Compare Across Formats
Word files reflow and stay editable; PDFs lock the layout for sharing. See what really separates .docx from PDF — and how to compare documents across both.
2026/08/11