Batch Processing Files: When It's Worth Doing All at Once
Published
If you regularly find yourself repeating the exact same operation — compressing a folder of product photos, converting a batch of scanned receipts — doing it one file at a time is usually the slowest and most error-prone way to work, simply because it multiplies the chance of a manual mistake by however many files you have.
The main thing to check before batch processing a large set of files is whether they actually need identical settings. Product photos from the same camera and lighting setup usually compress well with one shared quality setting; a mixed folder of scans, screenshots, and photos usually doesn't, since a screenshot with sharp text needs very different handling from a photo with smooth gradients. Grouping files by type before batch processing avoids the common failure mode of one setting looking great on some files and terrible on others.
For anything irreversible — like overwriting originals — it's worth keeping a backup of the source files until you've spot-checked a few results from the batch. A setting that looks fine on the first file in a batch of fifty doesn't guarantee it'll look fine on all fifty, especially if the files aren't perfectly uniform.