An offline TinyPNG alternative for whole folders of photos

Compress JPG, PNG and WebP images on your own computer — a whole folder at once, with a target size like 500 KB, and nothing uploaded.

Free · no account · 3 free uses of every tool · also for Mac (Intel), Windows, Linux

Online compressors such as TinyPNG and Squoosh are great for a few images. They get slow when you have a whole folder of holiday photos, product shots or scans — and every file has to be uploaded to someone else’s server first.

When an online compressor is fine

• A handful of images, nothing private.
• You are on a phone or a computer where you can’t install anything.

When an offline app is better

• Many files: drop a folder (and its subfolders) and compress everything in one go.
• Upload limits: choose “each image under 500 KB” (or 1 MB, 200 KB…) and every file is squeezed to fit.
• Privacy: ID scans, client photos and family pictures never leave your computer.
• Resize and convert in the same step: longest side 1920 px, output as WebP or JPG.
• Your AI can do it: ask Claude “resize the photos in ~/Pictures/trip to 1920 px, each under 500 KB”.

How to do it

1. Download GUI Hub Essentials and open Image Compressor.
2. Choose Compress a folder, pick the folder and an empty output folder.
3. Pick a quality, or Fit under a file size, then press Compress.

Originals are never changed. The engine is Caesium (Apache-2.0), downloaded from its official release. Each tool has 3 free uses; Essentials is $9 once after that.