Processed client-side in your browser — files never leave your device.
Free, with no signup, account, or usage limits.
Works on any modern browser, including mobile.
About this tool
Code Diff Checker is a free online utility to compare code files side by side (related: diff, code, compare). Processing runs locally in your browser — your input is not uploaded to ThothBox.
How to use
Open Code Diff Checker and paste or type your input.
Choose any options that affect the output.
Run the tool or watch the live result update.
Copy or download the output.
FAQ
What does Code Diff Checker do?
Compare code files side by side.
Is Code Diff Checker private?
Yes for typical use: input is processed in your browser and is not uploaded to ThothBox.
Is Code Diff Checker free?
Yes. It is free to use with no signup required.
How do I use Code Diff Checker?
Open the Code Diff Checker tool, then open Code Diff Checker and paste or type your input.