Resize, compress and convert

A tool chain for pictures: choose up to 30 images, set a maximum size, a quality and a format, and download them all. Nothing is uploaded.

What it does

When a batch of photos needs the same treatment, doing it one tool at a time is slow. This page chains three steps, resize, compress and convert, and applies them to every picture you choose, for example to get a folder of phone photos ready for a website or an email.

How to use it

1. Choose your pictures. You can add more than once; the list builds up to 30.
2. Step 1: set the largest width, and height if you need it. Leave both empty to keep the sizes.
3. Step 2: set the quality for JPG and WebP.
4. Step 3: choose one format for everything, or keep each picture’s own format.
5. Press Process, then download the files one by one or all together.

Worked example

Ten phone photos of 4000 × 3000, with maximum width 1600, quality 75 and format JPG, come out as ten 1600 × 1200 JPGs, each a small fraction of its original size.

How it works

Each picture is decoded, scaled down just enough to fit inside the maximum width and height while keeping its proportions, and encoded once in the chosen format and quality. Doing all three in one pass matters: every extra lossy save removes a little more detail, so one save is better than three. Pictures are processed one after another to keep memory use low.

Questions

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