File Diff Viewer — Free Online Tool
Upload or paste two text files and see a side-by-side comparison with color-coded line changes: green for additions, red for deletions. A summary at the top shows total lines added, removed, and unchanged. Useful for comparing configuration files, code versions, or any structured text.
100% client-side. No uploads. Your data never leaves your browser.
How to use File Diff Viewer
- Drop or upload the original file in the left panel.
- Drop or upload the modified file in the right panel.
- Color-coded differences appear immediately.
- Read the summary bar at the top for a count of added, removed, and unchanged lines.
Frequently Asked Questions
What is the difference between File Diff and Text Diff?
File Diff is optimized for comparing files you upload directly. Text Diff is for pasting text. Both use the same diff algorithm.
What file formats are supported?
Any plain text file: .txt, .json, .yaml, .js, .ts, .py, .css, .html, .xml, .csv, .log, etc. Binary files are not supported.
Is there a file size limit?
Up to 10 MB per file. Very large files with many differences may be slow to render.
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