Calculator
What the Rotate Image does
Rotate Image: rotates the image in 90-degree steps on a canvas, swapping width and height for quarter turns so nothing is cropped or letterboxed. Everything runs in your browser and the file is never uploaded.
Pick a file and the Rotate Image processes it right here in the page. Everything runs on your own device, which means no waiting and no copy left on a server.
Getting the dimensions right before upload avoids a lot of downstream cropping. That is usually what brings writers preparing assets for a post here.
Everything happens inside this page. Nothing you type is sent to a server, and there is nothing for us to store.
Everything needed to verify a result is further down: the fields, the method and one fully worked example.
What do the Rotate Image fields mean?
The Rotate Image uses 2 inputs. None of the boxes start empty. The page loads with a worked set of values you can edit or replace.
| Field | What to enter | Default |
|---|---|---|
| Image file | stays on your device | none |
| Rotate | choose from 90° CW, 180° or 270° CW | 90° CW |
How does the Rotate Image work?
Each output is derived from the inputs above in a single pass; there is no hidden state carried between runs, so the same inputs always give the same result.
Inputs are validated before anything is computed, so a bad entry is reported rather than quietly producing a wrong answer.
What a typical run looks like
You provide: Image file and Rotate
What happens: the file is read into memory by your browser, processed locally, and offered back as a download. It is never uploaded.
You get back: the output file, and a status line reporting what the tool read and wrote.
A fast machine finishes sooner than a slow one, and the only ceiling on file size is the memory available to the page.
How to use it
- Choose your file under Image file, or drag it onto the drop area.
- Pick a value for Rotate: the options are 90° CW, 180° or 270° CW.
- Press Rotate.
- Read Status in the results panel.
- Use Copy Link if you want the same setup again later, or Print for a paper copy.
What this tool does not do
- Re-encoding a lossy format such as JPEG always loses some detail, even at maximum quality.
- EXIF metadata may be dropped during processing, which is usually desirable but is worth knowing.
- Values outside the documented ranges are rejected rather than approximated.
- Performance scales with your own hardware, since no server does the work.
Frequently asked questions
2 things: Image file and Rotate. Each field is pre-filled with a sensible default, so the form is usable immediately, without filling anything in first.
No. The file is read by your browser and processed inside the page. It is never sent to us, which is also why it keeps working offline once loaded.
Free for any use, personal or commercial.
It is exact within the stated method. Anything the method does not model is simply out of scope.