Free Bulk Image Compressor Online

WebP works in modern browsers and generally compresses better than older JPEG or PNG formats, making it a practical single-format export for a modern storefront. If your site must support an older browser or a workflow that cannot accept WebP, keep a JPEG or PNG fallback or choose JPEG in the tool.

Seller Image Studio accepts up to 100 supported images in one batch to protect browser memory and keep the queue responsive.

Yes. Add a folder to import supported JPG, PNG, WebP, AVIF, GIF and BMP files. With folder write permission, individual results and the ZIP can be saved to that folder; without permission, the ZIP uses the browser's default download location.

No. Compression, resizing and format conversion run on your device. The product images are not uploaded to Seller Image Studio.

Yes. SellerImg is free to use and does not require an account, payment card, subscription, conversion credits or an advertisement before download.

AVIF can produce smaller files than JPEG or WebP at similar visual quality, but it is still less universal than WebP across browsers, servers, CDNs, themes and ecommerce upload workflows. If your complete storefront pipeline supports AVIF, it is a strong format to test and can be used as the preferred product-image delivery format with a WebP or JPEG fallback. Marketplaces are different: Amazon, TikTok Shop and other sales channels must still receive the formats required by their current listing rules.

Yes. SellerImg processes portraits and other supported images locally in your browser, so the files are not uploaded to SellerImg's servers. The original files stay unchanged. As with any sensitive material, use a trusted device and browser and review the finished image before sharing it.

TinyPNG is a mature online compression service focused on simple uploads and content-aware compression. According to its own documentation, uploaded images are stored temporarily and deleted within 48 hours. SellerImg is built for a different workflow centered on privacy, precise output controls and ecommerce batch processing. Images are processed on your device without being uploaded; you can choose the output format, quality mode and longest-edge limit, apply ecommerce presets, process up to 100 files, and save individual results or a ZIP to an authorized folder. The tools have different strengths, and SellerImg does not claim smaller results for every image. Choose based on your privacy requirements, image quality and workflow.