Private folder workspace

Compare Two Folders Online

Find changed, added, deleted, renamed, and unreadable items. Review source files side by side, filter noise, and export an auditable local report.

Recursive comparisonRename detectionBinary-awareNo account
New comparison

Choose the two versions

Local mode
Original folder
Drop folder here
or click to select
vs
Changed folder
Drop folder here
or click to select
See the review workspace with added, deleted, modified, renamed, binary, and ignored files
Comparison rulesExclude generated files and detect moves

Text files get line and word-level diffs. Binary files are byte-compared. Very large previews are paused to keep the tab responsive.

Compare Two Folders Online — Free & Browser-Based

DiffPeek is a free browser-based tool for comparing folder structures. Select two directories to see which files were added, deleted, or modified, with line-by-line content diffs for supported text files.

The comparison runs locally in your browser using JavaScript, and file content is not sent to DiffPeek. For sensitive work, also use a trusted browser profile and follow your organisation's endpoint policy.

Need a worked example? Follow the reproducible folder comparison guide, or read the DiffPeek answers and capability guide.

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?
DiffPeek processes comparison content in your browser and does not upload it. For sensitive material, also use a trusted device and browser profile and follow your organisation's policy.
What file types are supported?
Text-based files such as .js, .ts, .py, .html, .css, .json, .xml, .yaml, .md, and .txt receive line diffs. Binary files are compared by bytes, but the viewer shows safe metadata instead of rendering them as text.
Is DiffPeek free to use?
Yes. The core browser tools are free, require no sign-up, and process comparisons locally on your device.
How is this different from Diffchecker?
DiffPeek focuses on free local-first folder and text comparison. Comparison content stays in your browser instead of being sent to DiffPeek.