Question 1

Is Sarah’s File Lab really free?

Accepted Answer

Yes. Every tool is free, with no account, no watermark and no limits on use.

Question 2

Are my files uploaded anywhere?

Accepted Answer

No. All processing happens locally in your browser. Close the tab and everything is gone.

Question 3

Does it change the files on my computer?

Accepted Answer

No. Your originals are never modified. The renamed and organized result is exported as a ZIP file.

Question 4

How are duplicates detected?

Accepted Answer

By content. Files with the same size are compared with a SHA-256 hash, so renamed copies are found too. The first file of each group is kept. Files over 128 MB are compared by sampled content.

Question 5

Can I undo my changes?

Accepted Answer

Yes. Every action can be undone and redone, up to 100 steps, and the History panel lists them.

Question 6

How many files can I handle?

Accepted Answer

Up to 20,000 files at once. Very large sets, over about 1.5 GB, may run out of browser memory when building the ZIP, so split them into batches.