Question 1

How many images can I resize at once?

Accepted Answer

Up to fifty, totalling 250 MB, with no single file over 30 MB or 80 megapixels, and you can add them in several goes rather than all at once. Those limits are about time and about what a browser canvas will allocate, not about memory: each image is decoded, resized and released before the next one starts, so only one picture is ever held at a time. Anything that does not fit is named in a message rather than silently dropped, and the counter above the list shows how much of the allowance is used.

Question 2

My images have different shapes. What happens to them?

Accepted Answer

With Keep aspect ratio ticked, or by percentage, nothing surprising: each image keeps its own proportions, so a portrait and a landscape given the same width simply come out with different heights. That is almost always what you want for a mixed folder, and it is why the box you did not type into can show “Varies” instead of a number — there is no single figure that would be true for all of them. Unticking Keep aspect ratio is what forces every image into the same box, and there you pick whether the overflow is cropped from the center, padded with a color, or stretched.

Question 3

Will resizing make my image blurry?

Accepted Answer

Shrinking should not, and this tool goes out of its way to prevent it by scaling down in halving steps rather than in one jump. Enlarging is a different matter: there is no way to recover detail that was never captured, so an image scaled up past its original size will always look softer. If you need a bigger version, go back to the original file rather than growing a small copy.

Question 4

Which format should I pick?

Accepted Answer

JPG for photographs going anywhere that has to be universally readable. WebP for the web, since it is usually a third smaller than JPG at the same visual quality and, unlike JPG, keeps transparency. PNG when the image has flat colors, sharp edges or transparency that must stay exact, such as a logo or a screenshot with text. PNG on a photograph will be several times larger for no visible gain.

Question 5

Can I resize to a specific file size?

Accepted Answer

Yes, for JPG and WebP. Tick “Aim for a size”, type a maximum in kilobytes, and each image is encoded a few times at different quality settings until the best-looking one that still fits is found. No encoder can be told a byte count directly, because the size falls out of the image content rather than the settings, so every tool that offers this works by encoding and measuring. File size rises with quality, which makes it a binary search rather than a scan: seven passes narrow the whole range down to the exact percent. PNG has no quality dial, so the option only appears for the lossy two, and if even the lowest quality is still too big you are told which images missed and asked to reduce the width as well.

Question 6

How is the ZIP built, and is it compressed?

Accepted Answer

The entries are stored rather than deflated. That is deliberate: JPEG, PNG and WebP are already compressed, so running deflate over them costs time to save a fraction of a percent. The archive is an ordinary ZIP that Windows Explorer, macOS Finder and every unzip tool opens normally, with the original filenames preserved and duplicates numbered so nothing is overwritten.

Question 7

Does resizing reduce the file size?

Accepted Answer

Almost always, and roughly with the pixel count rather than with the width. Halving both sides removes three quarters of the pixels, so the file usually shrinks by something close to that. The totals shown after you press Resize are the real byte counts of the files you are about to download, not estimates, because they are measured from those files.

Question 8

What happens to the EXIF data?

Accepted Answer

It is not carried over. Resizing decodes the picture into raw pixels and encodes it again, and no metadata survives that round trip: camera model, lens, timestamp, orientation and GPS coordinates are all absent from the output. Orientation is the one that would otherwise cause trouble, and it is applied to the pixels themselves before resizing, so a photo shot in portrait stays portrait rather than falling on its side.

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Image Resizer

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