Resize Images on Download: Fit Modes and Dimensions

Resizing while you download, not after

If your batch is destined for the web, a CMS, or a client deliverable, you usually do not want full-resolution originals. The normal routine is to download everything, then run it through a separate resizer. Bulk Image Downloader From URL List folds that step into the download itself. Resizing happens client-side in the browser as each file comes down, so the images that land in your folder are already the size you asked for.

This is configured per download task on the options page, which means one task can resize while another leaves originals intact.

The resize controls

Resize gives you the settings you would expect from a proper image tool:

• Max width and height — the bounding dimensions your images should respect.
• Fit mode — how each image relates to that box: inside (scale to fit within the dimensions, keeping the whole image), cover (fill the box and crop the overflow), or fill (stretch to the exact dimensions).
• Output format — JPEG, WebP, or PNG for the resized result.
• Quality — a slider to trade file size against fidelity.
• Concurrency — a slider, one to fifteen, controlling how many images run through the resizer at once.

Picking the right fit mode

The fit mode is the decision that matters most, because it changes what your images look like, not just how big they are. Use inside when you must keep every image whole and just need a ceiling on dimensions — ideal for galleries and mixed aspect ratios. Use cover when you need uniform tiles or thumbnails and are happy to crop edges to get there. Use fill only when exact pixel dimensions are non-negotiable and you can accept distortion on images that do not match the target ratio.

What the concurrency slider does for you

Resizing is real work, and the concurrency slider lets you decide how aggressively the browser tackles it. Push it toward fifteen and a big batch processes faster. Pull it down if you are on a modest machine or running other heavy tabs and want to keep things smooth. There is no single correct value — it is a throughput-versus-comfort dial you set to match your hardware.

Where resize sits in the pipeline

The processing order is fixed and predictable: the file downloads, then resize runs, then EXIF is stripped if you enabled it, then a watermark is applied if you set one up, and finally the file saves. One thing to keep in mind — resize and convert are mutually exclusive on a single task. If you need to both resize and change format in one operation, run resize with a chosen output format, or split the work across two tasks. For straightforward downscaling to web-ready dimensions, resize on download is the fastest route from a URL list to usable images.