What the image resizer does
The CubTools image resizer changes your images' dimensions — scale by percentage or set exact pixel widths and heights. Select up to 20 JPG, PNG, or WebP images and each resizes automatically, with an aspect-ratio lock to prevent squished results.
Every image gets a card showing original and new dimensions plus file sizes, so you can confirm the resize did what you intended before downloading individually or as a ZIP.
Resizing step by step
Select your images — resizing begins the moment you choose them. Pick your method: percentage for quick scaling (50% for half size), or exact pixels when a destination demands specific dimensions like 1920×1080.
Keep the aspect-ratio lock on unless you deliberately want to change proportions — it keeps width and height scaled together so circles stay circular. Review the dimension readouts on each card, then download.
Percentage vs. exact pixels
Percentage is fastest for general shrinking: 50% halves dimensions (quartering pixel count), 25% is aggressive but fine for thumbnails. Use it when the exact size does not matter, only 'smaller'.
Exact pixels are for specifications: social banners, upload limits, design mockups. Enter the width (or height) with the lock on and the other dimension follows proportionally. Entering both with the lock off stretches the image — occasionally intended, usually a mistake.
After resizing
Resized images are ideal candidates for compression next: smaller dimensions plus smart compression produce dramatically lean files. The two tools pair naturally — resize for dimensions, compress for bytes.
Check sharpness at the new size, especially after large reductions: downscaling can soften fine detail slightly. For most web uses this is invisible, but give critical images a glance before publishing.
Resizing for specific platforms
Common targets, ready to use: blog content images 1200px wide, social posts 1080px on the long side, thumbnails 400px, email images 600px wide. These cover the vast majority of resizing jobs — enter the width with the aspect lock on and let the height follow proportionally.
Marketplaces and ad platforms publish exact specifications, often 2000px or 1080px on a side: match them precisely rather than approximating, since some platforms reject or badly re-scale non-conforming uploads. When torn between two sizes, choose the larger — downscaling later is always safe, upscaling never is.
For profile pictures and avatars, square targets like 800×800 work best: crop to a square first in any editor, then resize to exact pixels with the lock off for that final step. The result is a clean, intentional square — never a stretched rectangle.
Steps
- Open the CubTools image resizer — no sign-up needed.
- Select up to 20 JPG, PNG, or WebP images; resizing starts automatically.
- Choose percentage scaling or enter exact pixel dimensions.
- Keep aspect-ratio lock on (unless intentionally changing proportions).
- Review each card's original vs. new dimensions.
- Download individually or as a single ZIP.
Frequently asked questions
Is the image resizer free?
Yes — free, no account, no watermarks. Resize up to 20 images per batch, all processed locally in your browser.
How do I resize without distorting the image?
Keep the aspect-ratio lock enabled. It scales width and height together so proportions stay correct — no stretching or squishing.
Can I resize by exact pixels?
Yes — enter the target width or height in pixels. With the lock on, the other dimension adjusts automatically to preserve proportions.
Will resizing reduce file size?
Usually yes, significantly — fewer pixels mean less data. Pair resizing with compression afterward for the leanest files.