Change width and height while preserving aspect ratio so the image does not look stretched or squashed.
When this guide is useful
When the original aspect ratio is preserved, width and height change together and the image keeps a natural shape.
Think about where the file will be used. Messaging, social media, websites, presentations and archiving can require different sizes and formats.
How to decide without overcomplicating it
Choose the dimension that matters most for your destination, such as article width or thumbnail size, and let the other dimension follow the ratio.
Always start with a copy of the original file. That gives you a reference and lets you try another setting without losing the best-quality source.
How to check whether the result is good
Make a first attempt with moderate settings. Then review the full result, especially areas with small text, faces, music, transitions or fine detail.
Recommended step-by-step
- Always start with a copy of the original file. That gives you a reference and lets you try another setting without losing the best-quality source.
- Choose the dimension that matters most for your destination, such as article width or thumbnail size, and let the other dimension follow the ratio.
- Make a first attempt with moderate settings. Then review the full result, especially areas with small text, faces, music, transitions or fine detail.
- Think about where the file will be used. Messaging, social media, websites, presentations and archiving can require different sizes and formats.
Common mistakes to avoid
Avoid setting unrelated width and height values unless you intentionally want a different ratio, because people and objects can become distorted.
Checklist before downloading or sharing
- The final file opens correctly on the device or app where it will be used.
- The important content remains readable, audible or visually natural.
- The size and format fit the goal without unnecessary quality loss.
- You kept the original in case you need to process it again.