The short version
Bulk Image Resizer and Batch Resize Images are both Chrome extensions that resize images in batches directly in the browser, with a dedicated worker doing the actual resize off the main thread. Architecturally they're similar. Where they diverge is in what happens to a batch once it's queued — how many sizes come out of one run, and what finishing options are available before the files land on disk.
This page sticks to what's verifiable in each extension's own code, not marketing copy, and covers five specific batch-workflow and finishing features — not every feature either extension has.
Side-by-side
| Capability | Batch Resize Images | Bulk Image Resizer |
|---|---|---|
| Multiple output sizes in one batch run | One resize configuration per run — a thumbnail, a medium, and a full-size version each need a separate pass over the batch | Select several sizes up front and every image in the batch is resized to all of them in a single run |
| Watermark overlay | Not available — no watermarking code in the extension | Text or image watermark with position, margin, and opacity controls |
| Rounded-corner effect | Not available as an image-processing feature | Rounded corners applied to the resized output, by pixel radius or percentage |
| Save directly to a folder | ZIP download only, via the browser's downloads flow | Direct-to-folder save (no download dialog, no ZIP step required) or ZIP, your choice |
| Background fill when flattening transparency | No background-color control before drawing — flattening a transparent PNG likely defaults to canvas's default black background | Configurable background color applied before flattening, so transparent areas don't silently turn black |
Based on a direct read of each extension's own unpacked source as of October 2026, not either product's marketing copy.
Which one should you use? If you regularly need several output sizes from the same shoot — say, a thumbnail, a listing image, and a full-size version — generating them in one pass instead of three separate runs is the biggest practical time save. If you also want a watermark, rounded corners, a folder-save option, or control over what a flattened transparent image fills in with, those are built into Bulk Image Resizer and weren't found in Batch Resize Images' code. For anything about Batch Resize Images beyond what's listed here, check its own Chrome Web Store listing rather than relying on a competitor's page to describe it.
For more on how batching and presets work, see the step-by-step guide. For privacy and data-handling questions, check the FAQ, or read why local, browser-based processing differs from upload-based resize tools. Prefer a different comparison? See how Bulk Image Resizer stacks up against resizing images one at a time.