Folder Diff Checker

Compare two folders and see every changed file with full side-by-side diffs. Nothing is uploaded.

Original folder
Drop folder here
or click to select
vs
Changed folder
Drop folder here
or click to select

Supports all text-based files. Binary files are noted but not diffed.

Compare Two Folders Online — Free & Private

DiffPeek is the only free browser-based tool that compares entire folder structures. Select two directories, and instantly see which files were added, deleted, or modified — with full line-by-line content diffs for every changed file.

Everything runs locally in your browser using JavaScript. Your files are never sent to any server, making it safe for source code, configuration files, and private documents.

Frequently Asked Questions

How do I compare two folders online?
Select your two folders using the drop zones above — drag and drop or click to browse. Once both folders are loaded, click "Find Differences" to run the full comparison.
Are my files private?
Yes. DiffPeek processes everything in your browser. Your files are never uploaded to any server. This makes it safe for confidential code, private documents, and sensitive data.
What file types are supported?
All text-based files: .js, .ts, .py, .html, .css, .json, .xml, .yaml, .md, .txt, and more. Binary files like images are detected and noted but not content-diffed.
Is DiffPeek free to use?
Yes, completely free. No sign-up, no paywalls, no usage limits. All tools on DiffPeek are free forever.
How is this different from Diffchecker?
Diffchecker only supports folder comparison in their paid desktop app. DiffPeek offers full folder diff for free in the browser, with no uploads to any server.