How to Batch Convert and Compress Images

Converting one image is easy. Converting a folder of two hundred — a product catalogue, a photo shoot, a year of screenshots — is where a good batch workflow saves real time. The principle is simple: set your output rules once, apply them to everything at once, and collect the results in a single download. Here's how to do it well.

Set your settings before you add files

Batch processing works best when every image gets the same treatment, so decide on three things up front:

• Format — one target format for the whole set (e.g. WebP for the web, JPG for compatibility).
• Quality — a single quality level; 80% is a sound default for photos.
• Max width — a ceiling so oversized originals are scaled to a sane dimension.

With this tool, changing any of these after you've added images simply re-processes the whole batch automatically — so you can tweak and compare without starting over.

Add everything at once

Drag a whole selection (or folder contents) onto the drop zone, or click to multi-select in the file picker. You can add up to 200 images at a time. They're processed a few in parallel so a large batch moves quickly, and each row shows its own before/after size and percent saved as it finishes.

Download as a single ZIP

Once the batch is done, use Download all (.zip) to get everything in one file instead of clicking through dozens of individual downloads. The ZIP is assembled in your browser — no server involved — and if two images would end up with the same name, the tool automatically de-duplicates by appending a number so nothing is overwritten.

Keeping it fast and within limits

Because all the work happens on your own device, the practical limits are your browser's memory rather than any server quota:

• Very large images (over 80 megapixels) are scaled down to stay within safe canvas limits.
• On older phones, very big batches may be slower — split them into two or three smaller runs if things feel sluggish.
• Nothing is uploaded, so even confidential images stay entirely private.

A typical batch recipe

1. Pick WebP (or JPG), set quality 80%, set max width 1920.
2. Drop your whole image set onto the tool.
3. Wait for every row to show "done" and check the total saved.
4. Click Download all (.zip), unzip, and use the files.

For choosing the right settings, see compressing without losing quality, resizing for the web, and JPG vs PNG vs WebP.