When do you need to resize an image?
Resizing means changing an image's dimensions — its width and height in pixels. It's one of the most common photo tasks:
- Uploading photos to a website that requires specific dimensions (profile, cover, product).
- Reducing file size: a 4000 × 3000 px photo resized to 1600 × 1200 px weighs about six times less.
- Social media: every platform has its recommended sizes.
- Documents and presentations that get sluggish with huge images.
- Official forms that ask, for example, for an ID photo at an exact pixel size.
How to resize an image, step by step
- Choose the mode: “Pixels” for exact dimensions, or “Percentage” to scale (for example, to 50%).
- In pixels, type the width, the height or both. Leave one empty and it's calculated automatically to keep the proportions.
- “Keep aspect ratio” stops the image from being distorted: if you set both width and height, the image is fitted inside those dimensions. Turn it off only if you need exact dimensions even if it stretches.
- Add the images (before or after adjusting) and download the results, one by one or as a ZIP.
With several images, they're all resized with the same settings — ideal for preparing a batch of product or gallery photos.
Shrinking vs enlarging
When shrinking, Pasafoto scales in steps with high-quality smoothing so edges and fine textures don't turn jagged. When enlarging, remember that detail can't be invented: a small image blown up to 200% will look softer or blurry. For logos, if you have the SVG version, it's much better to export the SVG to PNG at the final size.
Reference sizes
| Use | Recommended size |
|---|---|
| Blog or website image | 1200–1920 px wide |
| Square social post | 1080 × 1080 px |
| Vertical story or reel | 1080 × 1920 px |
| Profile picture | 400 × 400 px |
| Full HD wallpaper | 1920 × 1080 px |
After resizing, you can compress the image to cut its size even further.
No uploads
The whole process happens in your browser: your images are never sent to a server. Free, no sign-up and no watermarks.
Pixels, inches and resolution
If you're asked for an image in inches for printing, convert them to pixels: multiply the inches by the resolution in dpi. For example, a 4 × 6 inch print at 300 dpi needs 1200 × 1800 pixels. On screens only pixels matter: the “dpi” value some files store doesn't change how they look on a phone or computer. If a website demands an exact size, turn off “Keep aspect ratio” only if you don't mind the image stretching slightly.
Frequently asked questions
How do I resize an image without distorting it?
Leave “Keep aspect ratio” on and enter only the width or only the height; the other dimension is calculated automatically.
Can I resize by percentage?
Yes, choose “Percentage” mode and enter, for example, 50% to halve it or 200% to double it.
Can I resize many images at once?
Yes, they're all processed with the same settings and you can download them as a ZIP.
Do I lose quality when shrinking an image?
You lose resolution, but the result looks sharp thanks to high-quality scaling. Enlarging can look blurrier.
Can I change the format too?
Yes, keep the original format or save as JPG, PNG or WebP.
Is it safe?
Yes, your photos are processed on your device and never uploaded to the internet.