How to Bulk Resize Images for E-Commerce or Social Media

Product listings and social posts both depend on images that are a consistent size. Doing that one file at a time in an editor is slow and easy to get wrong — dimensions drift, formats end up mixed, and file sizes creep up. Resizing in a single batch, directly in the browser, fixes all three at once: you pick one preset or one custom size, apply it to every file you select or an entire folder, and get a uniform, ready-to-use set out the other end.

Marketplaces and storefronts (Etsy, Shopify, Amazon, and similar platforms) expect product photos in consistent dimensions and formats. If your product shots come from different cameras, screenshots, or supplier photos, they rarely start out that size.

• Batch Processing — upload the entire folder of product photos for a listing (or a whole catalog) and process every image in one pass, instead of opening files one by one.
• Custom dimensions — set the exact width and height your storefront requires, and every image in the batch is resized to match.
• Multiple Formats — convert between JPG, PNG, and WebP while resizing, so you don't need a separate tool to change file types for different listing requirements.
• Quality Control — resize while keeping images sharp, so smaller, lighter files still look good in a storefront gallery or zoom view.

Because everything runs locally in the browser, your product photos — which may include unreleased inventory or private supplier images — never leave your device during this step.

Social platforms each favor different image sizes — profile photos, banner graphics, post images, and thumbnails rarely share the same dimensions. The extension's Smart Presets feature covers pre-configured sizes for social media and web use, so instead of looking up exact pixel dimensions for each platform and resizing manually, you select a preset and apply it across your whole batch of images.

• Profile and cover/banner images sized consistently across a set of accounts or posts.
• Post graphics and in-feed images resized in bulk before scheduling.
• Thumbnails prepared from a larger shoot, batch-resized down to a lighter, consistent size.

If a preset doesn't match what you need, custom width and height are available for exact control.

Many web-based resize tools require uploading your files to a server before you get anything back. Bulk Image Resizer works differently: resizing and format conversion happen locally in your browser tab. There's no upload step, no server-side copy of your images, and no waiting on a server queue — which also means it keeps working whether you're handling a handful of photos or a full folder.