Fifty product shots for a store. Two hundred event photos to send to attendees. A folder of team headshots that all need to be 400 × 400 for the About page. Resizing them one at a time is an afternoon; resizing them as a batch is a minute, provided the batch is set up so that one rule fits every file. That is the whole skill: choosing a rule (fit, fill, or exact) that produces consistent results across images that don’t all start the same shape. This guide covers the three rules, the decisions to make before you press go, and the checks afterwards.
The three resize rules
| Rule | What it does | Result | Use when |
|---|---|---|---|
| Fit (max width / max height) | Scales each image down so it fits inside the box, keeping its ratio | Mixed shapes, no cropping, no padding | Blog images, galleries, “just make them all smaller” |
| Fill / cover (crop to ratio) | Scales and crops each image to exactly the target ratio | Uniform shape, some edges lost | Product grids, thumbnails, headshots, social posts |
| Exact / pad | Scales to fit, then adds a background to reach exact dimensions | Uniform shape, nothing lost, visible padding | Marketplaces that require exact pixels, catalogue on white |
The Bulk Image Resizer offers all three, plus percentage scaling, and previews the first few images so you can see what the rule does to a landscape and a portrait before running the batch.
Decisions before you start
- Where are these going? The destination sets the size. Product grid: 1,000 × 1,000 fill. Blog: 1,600 max width fit. Email attachment set: 1,200 max fit. Headshots: 400 × 400 fill. The platform size table covers the rest.
- Do the images share a shape? If every source is 3:2 landscape, fill to 3:2 crops nothing. If they’re mixed, fill will crop and you need to know where: most tools crop from the centre, which beheads tall portraits. Use fit for mixed sets unless uniformity matters more than content.
- Do any need upscaling? Fit and fill normally only shrink. If some images are smaller than the target, decide whether to leave them (usual) or enlarge them (rarely good). Set “don’t enlarge” on.
- Output format and quality. Same as single-image work: WebP at ~80 for web, JPEG for compatibility, PNG for transparency. Resizing and compressing in one pass saves a second batch through the Bulk Image Compressor, though a separate compression pass gives finer control.
- Filenames. Keep the originals’ names (so references don’t break), or add a suffix (
-1600w) so both versions can coexist. Never let the tool rename toimage (1).jpg.
Common batch jobs, with settings
- E-commerce catalogue: fill 2,000 × 2,000, white padding for products shot on white, WebP + JPEG, quality 82. Consistent square tiles, zoomable.
- Event photos for attendees: fit 2,048 max, JPEG 85. Big enough to print a 6×4, small enough to share 200 of them.
- Team page headshots: fill 600 × 600 (displays at 300), WebP 80. Check the crop on each; faces off-centre need a manual adjustment.
- Blog archive cleanup: fit 1,600 max, don’t enlarge, WebP 80. Leaves small images untouched.
- Social carousel: fill 1,080 × 1,350, JPEG 85. One ratio so the carousel doesn’t jump.
- Email newsletter assets: fit 1,200 max, JPEG 75. Email clients don’t reliably show WebP.
Checks afterwards
- Open the three most different images in the batch (widest, tallest, smallest) and confirm the rule did what you expected.
- Look at any image with text or a face for crop damage.
- Check total size: a batch of 200 web images should be well under 40 MB.
- Verify orientation. Some phones store rotation in EXIF rather than in the pixels; a resizer that ignores it outputs sideways photos. The tool applies EXIF rotation before resizing, but check a few phone shots.
When bulk isn’t the answer
Hero images, the one product shot that carries a campaign, a profile photo for a press kit: anything a person will look at closely deserves a manual crop and its own settings. Bulk is for the eighty percent of images that need to be right, not perfect. Do those in a batch, then spend the saved time on the few that matter.
Frequently asked questions
How do I resize many images to the same size without distortion?
Use fit (keeps each image’s ratio, no cropping) or fill (crops to a uniform ratio). Never “stretch to exact” on mixed shapes.
Can I bulk resize without uploading my photos?
Yes. A browser-based resizer processes files locally and returns a zip; nothing is sent to a server.
What size should I bulk resize product photos to?
2,000 × 2,000 square for most marketplaces and stores; 1,000 minimum for zoom. Fill with padding if products were shot on a plain background.
Why are some photos sideways after resizing?
Their rotation was stored in EXIF metadata and the tool didn’t apply it. Use a resizer that honours EXIF orientation, or rotate those files first.
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