What image resizing changes
Resizing changes the pixel dimensions of an image. A 4000 × 3000 photo contains twelve million pixels; resizing it to 1200 × 900 produces a much smaller canvas while preserving the same 4:3 shape. This is useful for websites, email attachments, product listings and social media.
Pixels, percentage or presets?
Exact pixels
Use exact dimensions when a platform or layout specifies a required width and height. Keep the aspect-ratio lock enabled unless distortion is intentional.
Percentage scaling
Percentage is useful when the original dimensions are unknown or when several images should be reduced consistently. A 50% scale halves both width and height, reducing total pixel count to one quarter.
Presets
Presets provide common canvas sizes for square posts, thumbnails, headers and full-HD content. Platform interfaces change, so verify current requirements before a major campaign.
Quality and file size
Dimensions and compression are separate decisions. Resize first, then select JPG or WebP quality for photographs. Use PNG when transparent pixels or lossless interface graphics matter.
- Select an image.
- Choose pixels, percentage or a preset.
- Review the preview and download the result.