How to Batch-Compress Images (Tips for Doing Dozens at Once)
2026-06-29
If you run a blog, an online shop or a photo gallery, you rarely deal with one image — you have a folder of twenty, fifty, a hundred. Compressing them individually is tedious and error-prone. Batch compression solves it: load the whole set, apply one setting, download everything at once. Here's how to do it well.
Load the whole folder at once
Drag all your images into the upload area together, or select multiple files in the picker (hold Ctrl/Cmd to pick several). Our image compressor accepts batches and processes them in your browser, so even a large set never gets uploaded to a server. The bigger the batch, the more time you save versus doing them one at a time.
Pick one consistent setting
For a uniform look — important for a shop or gallery — apply the same quality to every image rather than tweaking each. Quality around 70–80 is the reliable sweet spot for web photos: big savings, no visible loss. If your goal is a hard size cap instead, use a target-size tool like compress to 100 KB, which hits the limit on every file automatically regardless of its starting size.
Consider converting while you're at it
If the images are headed for a website, batch-converting to WebP often beats plain compression — typically 25–35% smaller than JPG at the same quality. Run the set through JPG to WebP and you compress and modernise in one step. For very large source images, resize them to a sensible maximum width first; there's no point serving a 5000-pixel photo that displays at 800.
Download everything as a ZIP
Once processed, you don't want to click download a hundred times. After a batch, the tool offers a "Download all" button that bundles every result into a single ZIP file. Unzip, and your whole optimized folder is ready. The whole flow — load, set quality, download ZIP — turns an afternoon of fiddling into a one-minute job, all private and offline-capable in your browser.