How to use the Text Compare

  1. 1Choose or drop the original file on the left and the changed file on the right, or paste text into both boxes.
  2. 2Optionally ignore whitespace or letter case.
  3. 3Click Compare.
  4. 4Jump from change to change, or show only the changes.

About this tool

A fast diff for big files

Most online diff checkers freeze on large files or upload them to a server. This tool reads both files in chunks, compares their lines in a background thread and only draws the lines on screen, so even log files and data exports with millions of lines stay smooth.

Frequently asked questions

No. Both files are read and compared inside your browser, so they never leave your device.

Files with millions of lines work on most computers. The limit is your device's memory, up to 1 GB per file.

Removed lines that are directly replaced by added lines are shown as changed, with the edited part highlighted.

Any plain text file in UTF-8 or UTF-16: code, logs, CSV, JSON, XML, configuration files and more.

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