Folder Comparison and Backup Verification

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About this tool

Compare relative paths and SHA-256 hashes of two local file sets, then export added, missing and modified entries as CSV or JSON.

Common uses

Check a backup for missing files and changed contents.
Verify a website release package against its source directory.

How to use it

1.Select the baseline and new folders, or two file batches.
2.Compare, filter by status and review relative paths.
3.Export a CSV or JSON report containing full hashes and file sizes.

Limits and notes

Up to 2,000 files and 256 MiB per side; each file may be up to 64 MiB.
Folder mode strips the outer root name; file mode compares filenames only. Paths are case-sensitive and NFC-normalized; duplicates and case collisions within one side are rejected.
Empty directories are excluded. Files are never synchronized, copied or deleted; CSV exports protect formula-like values.

Frequently asked questions

Can the selected folders have different names?

Yes. Folder selection strips the browser-provided outer directory name and compares the relative paths below it.

How is a modified file identified?

The tool compares SHA-256 content hashes and byte counts at each path. Timestamps are ignored. A renamed path appears as an addition and a missing file.