Diff Checker
Compare two text files or code snippets to find differences and changes.
Diffchecker
Online text diff tool.
Fast, clean diff viewer with syntax highlighting. Supports multiple file types, side-by-side comparison. Most popular online diff tool.
Why I picked this:
Diffchecker is my top choice because it's fast, clean, and handles all the file types I need. The side-by-side comparison makes it easy to spot differences, and the syntax highlighting helps when comparing code. I've used it to compare configuration files, code snippets, and documents, and it consistently shows differences clearly. It's the most reliable online diff tool I've found.
VSCode
Built-in diff viewer.
VSCode has excellent built-in diff viewing. Select two files and compare. Convenient if you're already coding, integrated into workflow.
GitHub
Diff in pull requests.
View diffs in GitHub pull requests and commits. Great for code review, but requires Git repository and GitHub account.