Compress or Resize an Image: Which Should You Use?
If a photo is too large for an upload form or email attachment, first check what the recipient means by “size”: a file-size limit in kilobytes, or dimensions in pixels. These call for different changes.
Check the requirement first
A size such as 1200×630 describes pixels. A limit such as 200 KB describes the stored file. Two images with identical dimensions can have very different file sizes because of their detail, format and quality. Making a file smaller does not necessarily mean cropping it.
| You need | Use |
|---|---|
| A smaller file with the same dimensions | JPG or WebP compression |
| A smaller image with all content retained | Resize with proportions preserved |
| Exact dimensions and a chosen part of the photo | A fixed-frame crop |
| A transparent background | PNG or WebP |
Which format should you choose?
JPG is a practical choice for photographs, but our tool replaces transparency with white. WebP supports transparency and may give a smaller file; check that your recipient accepts it. PNG preserves transparency but may be larger and does not use the quality slider.
A practical sharing workflow
- Keep your original and open the image compressor.
- Choose JPG or WebP and start at 75% quality. Compare text and fine details in the previews.
- If the result is still too large, use batch image resizing to reduce its width and compare again.
- If exact dimensions are required, use crop and resize before compressing.
Check before downloading
Read the output size rather than assuming it is smaller. There is no current option to guarantee an exact size such as 100 KB. Check faces and text; increasing quality after details are lost does not restore them. If your original already meets the limit, you may not need compression.