Click the upload area or drag and drop your photo. JPG, PNG, JPEG, and WebP files are all accepted. No account or signup required.
Resize Image by Pixels
Enter exact width and height in pixels to resize your image. Lock aspect ratio to prevent distortion — free, no signup.
How to Resize an Image by Pixels Online
Enter your target KB value and click Resize. The tool loops through quality levels until the file fits.
Your resized file downloads instantly as a JPEG. Ready to upload to any form, platform, or portal without extra steps.
Common use cases
Profile photos, print documents, platform-specific image dimensions, and technical specifications that require exact pixel width and height are best handled by entering the numbers directly. This tool resizes to any pixel dimension instantly.
Pixels vs KB — what is the difference?
Resizing by pixels changes the actual dimensions of the image — how wide and tall it is in points on screen. Resizing by KB changes the file size through compression. For most platform requirements you need both: the right pixel size and the right file size. Use this tool to set the pixel dimensions, then use a KB tool if a file size limit also applies.
Frequently asked questions
What does 'lock aspect ratio' mean?
Aspect ratio is the proportional relationship between width and height. Locking it means if you change the width, the height adjusts automatically so the image does not look stretched or squished.
What pixel size should I use for social media?
Common sizes: Instagram post 1080×1080, Facebook cover 820×312, Twitter header 1500×500, YouTube thumbnail 1280×720, LinkedIn post 1200×627. Enter the exact dimensions for your platform.
Does resizing to smaller pixels reduce file size?
Yes. Reducing pixel dimensions also reduces file size because there are fewer pixels to store. However, compression (KB targeting) is more precise for hitting exact file size limits.
What formats can I upload?
JPG, PNG, JPEG, and WebP are all supported. The output is saved as PNG to preserve quality at the new dimensions.