When do you need batch image compression?
Most image compression tools online make you pick one image and wait. This one is built for the common real case: a folder of 20, 50, 100+ photos that all need to be smaller before they go into a CMS, an email, a product listing, or a slow website — without uploading a single one of them anywhere.
What's the difference between fixed quality and target size compression?
Fixed quality keeps the same compression setting across every image — good when your photos are already similar in content and you just want a consistent, predictable result. Compress to a target size instead aims for a KB limit per file (useful when a platform enforces a hard upload cap) — the tool will lower quality as needed to hit it, though extremely detailed or noisy images may not compress below a certain size no matter how low the quality goes.
Does compressing an already-compressed JPEG make it smaller?
Not much. Re-compressing an already-compressed JPEG at the same or a lower quality mostly just throws away more detail without shrinking the file much further — JPEG compression doesn't stack cleanly. If a batch of images is already fairly small, compressing again usually isn't worth the quality trade-off. Converting to a more efficient format (see the WebP/AVIF converter) is often a better move than squeezing an already-compressed JPEG harder.