Converting one image is a 30-second job. Converting 200 is an afternoon you'll never get back, if you do them one at a time.

I learned this the hard way, converting product photos for a client. Fifty images, one by one, clicking the same buttons. By image 20 I wanted to throw the laptop. There's a better way.

What batch conversion actually means

You point the tool at a folder (or select a pile of files), set your conversion once, and it processes everything. Same format, same size, same quality settings, applied to all of them while you do something else.

The settings you pick apply uniformly, so this works best when the images need the same treatment. A folder of product photos all going to WebP at 1200 pixels wide. A shoot's worth of HEIC files all becoming JPGs.

Setting it up right

Get the settings right on one image first. Convert a single file, check it looks good, then run the batch with those exact settings.

This test-first step is the whole trick. A wrong setting applied to 200 images is 200 wrong images. A wrong setting applied to one image is a 30-second lesson.

Name your outputs sensibly. Most batch tools let you add a suffix or prefix. "product-01.webp" beats "product-01-converted-final-v2.webp" when you're sorting through them later.

What batch conversion can't do

It can't make judgment calls. Images that need individual attention (different crops, tricky exposures, mixed orientations) don't belong in a batch.

Split your work: batch the uniform stuff, hand-tune the exceptions. I usually find 80 percent of a folder batches cleanly and 20 percent needs a human. That's still a massive time saving.

Watch the quality on the first few

Don't walk away immediately. Let the first 3 or 4 finish, open them, and check. Faces, text, fine detail. If those look right, the rest will too, and now you can walk away with confidence.

Practical tip: keep the originals in a separate folder and never batch-convert in place. If the settings were wrong, you still have the source files. Storage is cheap. Redoing a shoot is not.

Where to do it

Jiggle X Wiggle's free converter handles batch conversion right in the browser. Drop in the whole folder, set your options once, download the results. No account, no install.

One setup, hundreds of images, zero repetition. That's the workflow.