Images · Free browser tool
Private Image Resizer
Resize a JPG, PNG, or WebP by width, height, percentage, longest edge, or bounding box. Keep proportions and process the image locally.
Runs on this device
No file upload
Free to use
Private workspace
Create the exact dimensions you need without placing a private photo on someone else’s server.
Ready.
Selected file— · Reading…
Choose a file to begin
Create the exact dimensions you need without placing a private photo on someone else’s server.
What this tool does
A focused job, with a visible boundary.
Create the exact dimensions you need without placing a private photo on someone else’s server.
Aspect-ratio lock by default
Live output-dimension calculation
Know the limits
Local does not mean unlimited.
Browser processing protects the file from an upload workflow, but the browser, device, output format, and selected settings still matter.
- Making a small image larger cannot recreate missing detail.
- Re-encoding can change file size, metadata, and color behavior.
- Very large output dimensions may exceed browser memory.
Four local steps
How to use image resizer.
- 01
Choose a JPG, PNG, or WebP image.
- 02
Select a resize mode and enter the desired dimensions.
- 03
Review the calculated output dimensions.
- 04
Resize locally and download the new copy.
Clear answers
Image resizer questions.
Can I resize without stretching the image?
Yes. Proportions remain locked by default. You may unlock them deliberately when an exact width and height are required.
Can I resize an image by percentage?
Yes. Choose percentage mode and enter the percentage of the original dimensions you want.
Does NullKit retain my photo?
No. The selected image is read and resized locally in the current browser tab.