Choosing an image workflow
How to choose image size and format for sharing, web use, and storage
When an image needs to be smaller, decide where it will be used before lowering quality. This guide separates form uploads, web publishing, visual comparison, and original-file storage, then shows a safe order for checking the output with a browser-based compressor and resizer.
Updated 2026-08-25 · 6-minute read
Start with the use case, not a target number
A form or email may impose a file-size limit, while a web page is usually limited by the display dimensions and loading time. If the original may be needed later, keep it unchanged and create a separate working copy.
| Use case | Check first | Practical order |
|---|---|---|
| Form or email | File size limit | Reduce dimensions, then adjust quality |
| Web page or draft post | Displayed dimensions | Match the long edge to the display area |
| Image comparison | Same dimensions and format | Normalize both inputs before comparing |
A safe compression sequence
The image compressor and resizer on this site processes the selected image in the browser. Do not overwrite the original. Open the exported result and check both its appearance and its file size before using it.
- 1.Keep the original file as an untouched reference
- 2.Choose the output format and long-edge dimension
- 3.Check the exported size, dimensions, text, and edges
- 4.Save the result with a purpose-specific filename
When changing quality is not enough
For photographs, reducing dimensions can save more space than lowering quality alone. PNG is useful for transparency and sharp graphics, while JPEG or WebP may be smaller for photographs. Changing a transparent image to JPEG can change its background, so make the format decision last.
- Check that text remains readable after resizing
- Export once from the original instead of repeatedly recompressing a JPEG
- Confirm the receiving service’s size limit before choosing a target
Before you finish
- Kept an untouched original
- Chose dimensions for the real use case
- Checked size and visual quality
- Preserved required transparency and format