Folder Compare – Compare Two Folders Online

See which files were added, deleted or modified between two local folders, with line-by-line diffs for text files. Runs entirely in your browser.

Try it Free →

Features

📂

Recursive folder scan

Pick or drag two folders; every subfolder is scanned and files are matched by relative path.

⚡

Smart, fast comparison

Different sizes are flagged instantly; equal-size files are compared byte by byte in parallel Web Workers. Fast mode checks size + date only.

📝

Line-by-line text diff

Open any modified text or code file for a unified or split diff, and copy a unified patch.

🖼️

Image side-by-side preview

Changed PNG, JPG, GIF, WebP and SVG images are shown side by side with their dimensions.

🔒

100% private

Files are read with browser APIs on your device. Nothing is uploaded to any server.

📤

Export reports

Copy the result as Markdown or download a CSV with path, status, sizes and timestamps.

How to Use

Choose folder A

Click the first card (or drop a folder on it) to select the original folder.

Choose folder B

Select the folder you want to compare against, such as a backup or a newer release.

Compare

Click Compare. Adjust ignore rules (node_modules, .git…) or enable fast mode in Options if needed.

Review changes

Filter by Added / Deleted / Modified, switch between tree and list views, and click a file to see its diff.

Frequently Asked Questions

Are my files uploaded?

No. Everything runs locally in your browser using the File System Access API or a folder input. Your files never leave your device.

Which browsers are supported?

Chrome and Edge on desktop give the best experience (folder picker and drag & drop, re-reading from disk on rerun). Safari and Firefox fall back to a standard folder upload dialog.

How does it decide a file was modified?

Files with different sizes are modified. Files with the same size are compared byte by byte. In fast mode, only size and modification time are compared.

Can it handle large folders?

Yes. Common heavy folders like node_modules and .git are skipped by default, content checks run in parallel workers, and long result lists are virtualized. For tens of thousands of files, fast mode is recommended.

Is it free?

Yes, Folder Compare is completely free with no sign-up.

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