Resize Image in Pixels or KB
Resize an image by exact pixel width and height, and compress it to a target file size in KB. Lock the aspect ratio so nothing stretches, then resize and download. Runs in your browser, no upload, no account, no limit.
How to Resize an Image
Upload Your Image
Drag and drop your image or click to choose one. Its current pixel size fills in automatically.
Set the New Size
Type the width and height in pixels. Keep Lock Aspect Ratio on so the shape stays, and set a target KB if a form needs it.
Resize and Download
Click Resize and Download to save the image at the new size, compressed to your target file size.
Resize an Image to Exact Pixels and File Size
Resize by pixels and KB in one place
Most resizers do one job or the other. This one does both. Set the exact pixel width and height for the dimensions you need, set a target file size in KB for the limit you have to meet, and the tool handles both in a single pass. That combination is what most people searching for a pixel and KB resizer actually want, so you do not need one tool for dimensions and another for file size.
Type the width and height, and the resizer outputs an image at exactly that size with no rounding errors. Lock the aspect ratio and one side follows the other, so faces, logos, and product shots never stretch. When a form or portal caps the upload, set the target KB and the tool steps the JPEG quality down, shrinking pixels only if needed, until the file fits, so you resize by KB without guesswork.
Pixels vs KB: what is the difference?
These two get mixed up constantly, so here is the plain version. Pixels are the image’s dimensions, how wide and tall it is, like 1080 x 1080. KB (kilobytes) is the file size, how much space the image takes to store or upload. They are set independently: a 1080 x 1080 image can be 2 MB or 80 KB depending on how much it is compressed.
| Pixels | KB (file size) | |
|---|---|---|
| What it is | Width x height (dimensions) | Storage / upload size |
| Example | 1080 x 1080 | 50 KB |
| Set it when | A layout or spec needs exact dimensions | A form caps the upload size |
| Affects quality? | Only if you enlarge past the original | Lower KB means more compression |
Can you convert pixels to KB?
Not directly, and any tool that claims a fixed pixel-to-KB conversion is guessing. Pixels measure dimensions and KB measures file size, so there is no single formula between them, the same pixel size can weigh very different KB depending on detail and compression. What you can do, and what this tool does, is set both at once: pick your pixel dimensions, then set the KB ceiling, and it compresses to meet that file size while holding the dimensions you chose.
Formats, quality, and privacy
Upload JPG, PNG, WebP, or GIF. The resized result downloads as a JPG, which keeps the file light for web and form uploads. Shrinking an image keeps it sharp; enlarging far past the original can look soft because there are no extra pixels to invent, so resize down or stay close to the source for the cleanest result. Everything runs in your browser, so the image never leaves your device, nothing is stored, and there is no sign up.
Need other units? Use the resize image in cm or resize in inches tools. To hit only a file-size limit, use reduce image size in KB, or push a file up to a minimum with increase image size in KB. Doing a whole folder? The bulk image resizer handles many files at once. New to the pixels-versus-DPI side? Our guide on how to check the DPI of an image explains it.
Why Use Our Image Resizer?
Exact Pixel Sizing
Type the width and height and the image is resized to those exact pixels, with no rounding.
Lock Aspect Ratio
Change one side and the other follows, so faces, logos, and shapes never stretch.
Hit a Target KB
Set a file size and the tool compresses the image to match it, handy for uploads with a size cap.
Live Preview
See the image at the new size right away, with the pixel dimensions shown as you type.
JPG, PNG, WebP, GIF
Upload any common image format and the resized result downloads as a lightweight JPG.
Fully Private
Everything runs in your browser. The image is never uploaded to a server or seen by anyone.
Similar Tools
More Image tools you might find useful.
Frequently Asked Questions
Common questions about resizing images online.
How do I resize an image in pixels and KB at the same time?
Upload the image, set the target width and height in pixels, then set the target file size in KB, and resize. The tool matches your exact dimensions and compresses the JPEG until it fits the KB limit, both in one step, so you do not need a separate resizer and compressor.
How do I resize an image to exact pixels?
Upload your image, type the target width and height in pixels, and click Resize and Download. The image is resized to those exact dimensions. It is free and runs in your browser.
How do I reduce an image to 20, 50, or 100 KB?
Set the target size field to the KB you need, for example 20, 50, or 100 KB. The tool lowers the JPEG quality, and shrinks the pixels only if required, until the file reaches that size. It is the quickest way to meet a form KB cap without trial and error.
Can I resize an image to a specific KB size?
Yes. The target size field defaults to your uploaded file size, and you can lower it. The tool tunes the JPEG quality, and shrinks the pixels only if needed, to match the KB you set.
Can you convert pixels to KB?
Not directly. Pixels are the image dimensions and KB is the file size, so there is no fixed formula between them, the same pixels can weigh different KB depending on compression. Instead, set both here: choose your pixel size, then set the KB limit, and the tool compresses to fit while keeping your dimensions.
What is a pixel and KB converter?
In practice it is a resizer that controls both dimensions (pixels) and file size (KB) in one place, since the two cannot be converted directly. This tool does exactly that, you set the pixel width and height and the KB target, and it outputs an image that meets both.
What pixel size should I use for common uploads?
Square social posts use 1080 x 1080, landscape video thumbnails 1280 x 720, and full HD banners 1920 x 1080. For forms, follow the exact pixels the portal asks for. Set the size here, add a KB limit if the form has one, and download.
How do I keep the image from stretching?
Keep Lock Aspect Ratio turned on. When it is on, changing the width updates the height automatically, so the picture keeps its original shape and nothing looks squashed.
Does resizing lower the image quality?
Making an image smaller keeps it sharp. Making it much larger than the original can look soft, since there are no extra pixels to add. For best results, resize down or keep close to the original size.
What image formats can I resize?
You can upload JPG, PNG, WebP, and GIF images. Whatever you upload, the resized result downloads as a JPG, which keeps the file small for the web and uploads.
Is my image safe when I resize it?
Yes. The whole process runs inside your browser, so the image never leaves your device and is never uploaded to a server. Nothing is stored or shared.