Why Your Git Diff Shows Hundreds of Changes When You Edited One Line

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Large, unexpected diffs in pull requests are often caused by invisible character differences rather than actual code changes. Common culprits include mismatched line endings between Windows (\r\n) and Linux (\n) systems, trailing whitespace added by editors on save, and encoding shifts such as BOM insertion or latin-1 to UTF-8 conversions. Developers can diagnose these issues using commands like git diff --ignore-cr-at-eol or git diff -w to isolate real changes from whitespace noise. To prevent such problems, teams can standardize settings through a .gitattributes file using text=auto eol=lf and align editor behavior via .editorconfig. Reviewing diffs with whitespace-ignoring flags before pushing is recommended to keep pull requests clean and reviewable.

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