Keep the original until the destination accepts the copy
The original gives you a way back if an upload rejects the result, a crop removes too much, or you later need transparency or a different layout. Work from a copy and check the final download rather than assuming the first export is final.
1. Match the tool to the job
Read the receiving form, print brief, or document request first. It may specify a file type, a maximum file size, pixel dimensions, a visual crop, or a PDF. Those requirements are not interchangeable.
Only part of the picture should remain
Use a crop when the visible area needs to change. Choose the area deliberately and review what the new edges exclude.
Crop an imageThe receiving service needs a different type or a smaller file
Use a conversion when the requirement is JPG, PNG, WebP, or a maximum file size. A file-size target is not a request to silently change its dimensions.
Convert an imageSeveral images need to travel as one document
Use a PDF when the recipient expects pages in a fixed order. Check page order and orientation before you share it.
Create an image PDFImages belong in one long visual sequence
Use a vertical stitch only when one combined image is the requested result. It is different from a multi-page PDF.
Stitch images vertically2. Make the visual decision before the size decision
Cropping changes what is visible. Conversion changes the file container and may change transparency or compression. A file-size target controls the weight of the copy. Decide the visible area and required dimensions first; then use a target-size conversion only if the destination has a maximum.
Check whether the destination gives a width, height, aspect ratio, or a fixed crop area.
Confirm whether transparent areas must stay transparent; JPG does not keep an alpha channel.
When there is a maximum size, choose the stated limit and verify whether the result actually met it.
For a specific maximum such as 100 KB, use the target image-size guide after you have decided on the crop and format.
Avoid a chain of repeated conversions
Each lossy conversion can reduce detail. If the first result is not suitable, return to the source image instead of converting the downloaded copy again. A successful download does not prove it meets a third party's visual or technical rules.
3. Review the exact copy you will upload or share
Open the downloaded result and check the details that matter for its destination. For a crop, check the edges. For a compressed image, check fine text and faces. For a PDF, check page order. For a stitched image, inspect the joins and the final height.
Visual check
Look at the downloaded file at a useful size. Check important text, product details, signatures, and the intended crop boundary.
Destination check
Confirm the destination accepts the chosen type, dimensions, size, and page layout. Its own preview and published rules are the final authority.
Common questions
Should I crop before I compress an image?
Usually, yes, if the final copy needs a different visible area. Decide the composition first, then create a size-targeted copy from that intended crop. Keep the original in case the result needs a different choice.
Is an image PDF always better than a single image?
No. Use a PDF only when the next destination expects document pages or a fixed sequence of images. A single JPG, PNG, or WebP can be more suitable for a web form or image library.
Do these tools decide whether an image is acceptable for an application or ID check?
No. They can prepare a local copy according to your choices. The organisation receiving the file decides whether its visual content and technical properties meet its current rules.