About Resizly
Resizly is a bulk image resizer that runs entirely in the tab it is open in. It exists because the job it does — a folder of photos, several sizes each, consistent names, one archive at the end — is a job people either do one file at a time or write a script for, and there was no good free thing in between.
Why it is a pipeline and not a form
A form asks for a width and gives you a file. That is a fine shape for one photograph and the wrong shape for two hundred, because the interesting decisions in a bulk job are not the numbers — they are which files a setting applies to, what the outputs are called, and what happens when two of them want the same name. Those are rules, so the tool is built out of rules.
The consequence is the screen nobody else builds: a table of every file that will be written, with its name and its size, before anything runs. A bulk job that produces the wrong six hundred files has cost more time than doing it by hand, and the only way to avoid that is to be able to read the answer before paying for it.
Why the name means nothing
Every other tool of this kind is named after the thing it does. Resizly is not, and that is a deliberate trade: less traffic from people typing the job into a search box, and a name that can be typed from memory once it has been used. If you are here because someone sent you the link, that trade has worked.
What it does not do
Today it does not do the following. Some of them are on the way; until a feature ships, this list says so rather than the front page pretending otherwise:
- Recovering real detail in a small image. Enlarging is done with Lanczos-3, or with an optional on-device model that adds plausible texture; that texture is invented, not recovered.
- Changing an image’s shape by inventing new edge pixels.
- Hitting an exact byte count. A KB limit is a ceiling: the file lands at or under it, never padded up to it.
- Replacing a photo’s background, for passport photos or anything else.
- Putting a mark on three hundred product photos.
- Retouching. The size matrix moves a crop window over the picture; it does not edit what is inside it.
Who builds it
Resizly is built and run as an independent product by a small team that cares about one job: getting a whole folder of images to the right sizes without sending any of it anywhere. There is no account, no server-side queue and no advertising. Questions and bug reports go through the contact page.
It is a web page, and web pages have ceilings
Everything here runs on your own processor inside a browser tab, which means it is bounded by what that tab is allowed to hold. A shell script on the same machine will always be faster, a phone will always manage fewer files than a laptop, and a folder large enough will eventually be too large. Where those edges are is written on the front page rather than discovered at file 140.
The tool is on the front page. What it stores, and what it does not, is on the privacy page.