Bulk Image Compressor

No hard limits are imposed on the number of files. You can process dozens or even hundreds of images in a single session, depending on your device's available RAM and CPU. For very large batches (500+ files), we recommend splitting into two sessions to keep processing smooth and avoid browser memory pressure.

No. Transparent PNG and WebP files will retain their alpha-channel transparency fully intact after compression. We use lossless palette optimization for PNGs, which means logos, icons, and graphics with transparent backgrounds will compress cleanly without any fringe artifacts or unwanted background fill.

Our smart compression algorithms are tuned to minimize perceptible quality loss. At Medium compression - which is the recommended default - the visual difference between the original and compressed version is imperceptible to the human eye for the vast majority of photos and graphics. At High compression, very fine details may show minor degradation, but the results are still perfectly acceptable for web thumbnails, email previews, and social media posts.

Yes, the tool is fully functional on modern mobile browsers including Chrome for Android and Safari on iOS. However, due to the memory constraints of mobile devices, we recommend keeping batch sizes under 30–50 files when processing on a phone or tablet. For large batches of 100+ images, a desktop or laptop browser is recommended for the best performance.

Absolutely not. This tool operates entirely within your browser using WebAssembly. Your images are never transmitted to any server - not ours, not a CDN, not a cloud processing service. Everything happens locally on your device. This is fundamentally different from server-side tools like TinyPNG or iLoveIMG, which upload your files to remote infrastructure for processing. Our approach guarantees complete privacy with no risk of data breaches or unauthorized access.

The tool currently supports JPG/JPEG, PNG, WebP, and static GIF files. Animated GIFs, TIFF, BMP, HEIC/HEIF, and RAW camera formats are not supported at this time. If you need to compress HEIC photos from an iPhone, convert them to JPEG first using your phone's sharing settings or a conversion tool, then run them through the bulk compressor.

Results vary by image content, format, and chosen compression level. In our testing, JPEGs commonly see 40–70% size reduction at Medium quality with no visible difference. PNGs with large flat-color areas can often be reduced by 60–80%. WebP files, which are already efficient, typically see 20–40% further reduction. Highly detailed photographic content compresses less aggressively than graphics with flat colors or text.

Yes - this is one of the most common professional use cases. Google PageSpeed Insights and Lighthouse frequently flag 'Serve images in next-gen formats' and 'Efficiently encode images' as optimization opportunities. By running your site's images through our bulk compressor before uploading, you can dramatically reduce your page's total image payload, directly improving your Largest Contentful Paint (LCP) score and overall PageSpeed score.

Yes. All compressed images retain their original file names in both the individual download and the ZIP archive. This makes it easy to replace files in your existing projects without having to rename anything manually.

Yes, completely free - no hidden charges, no premium plan required for unlimited processing, and no credit card ever needed. We do not cap the number of free compressions per day or per month. The tool is supported by non-intrusive display advertising, so you can use it as heavily as you need without ever paying anything.