Bulk Compressor

The main difference is the ZIP download — Bulk Compressor packages all compressed images into a single ZIP file so you can download everything with one click. It also has no file count limit and shows a per-file savings breakdown in a scrollable list. The regular Image Compressor is better for smaller batches where you want to download individual files.

There’s no hard limit — you can compress as many images as your browser’s memory allows. For most devices, batches of 100–500 images work well. Very large batches of high-resolution photos (500+) may slow down or exceed memory limits. If you hit issues, process in smaller batches of 100–200 at a time.

For website images: 75–82 gives excellent results with file sizes typically 60–80% smaller than the original. For social media: 80–85 balances quality and size well. For archiving or print: 90–95 is barely distinguishable from lossless. Only go below 75 if you specifically need very small files.

Yes — WebP typically produces files 25–40% smaller than JPG at equivalent quality. If you’re compressing images for a website and browser compatibility isn’t a concern (WebP is supported by 97%+ of browsers), choosing WebP as your output format will give you significantly smaller files. For sharing with people or uploading to services that may not support WebP, stick with JPG.

No — all compression happens entirely in your browser using the Canvas API. Your images never leave your device. The ZIP file is also built client-side using the JSZip library. Nothing is transmitted to our servers at any point in the process.