Upscale an image's resolution in pixels

What this tool actually does

This tool increases an image's pixel count through interpolation — a resampling technique that calculates each new pixel from the neighboring pixels already present in the original image. There's no AI here, no model running behind the scenes, and no attempt to guess what "should" be in an area of the photo. The result has more pixels, but not more information than the input file already contained.

That matters because there's a common expectation, shaped by a different category of tool, that "increasing resolution" makes a photo sharper or recovers lost detail. That's not what happens here, and this distinction is the central point of this page, not a footnote: if the image you upload is blurry, pixelated, or low on detail, the result is a larger version of that same image, with the same blur, pixelation, or lack of detail — just spread over a bigger area.

So what's it actually for

There are legitimate uses for increasing dimensions without adding detail. The most common is meeting a minimum size requirement: sign-up systems, listing forms, and marketplace catalogs often reject images below a specific width or height in pixels, even when the image's visual quality is already good enough for the intended use. Increasing the dimension clears that kind of administrative blocker.

Another use is prepping an image for printing at a physical size larger than the original file was meant to support — a photo captured for a screen may need more pixels to fill a sheet of paper without getting visibly stretched by the printing software itself. And the third use is standardization: when a set of images of different sizes needs to end up at the same dimension before being published, resizing everything to a common value handles that in one batch pass.

Scale or exact dimension

The tool offers two ways to set the final size. By scale, you choose 2x, 3x, or 4x, and the original image is multiplied equally on both dimensions — the ratio never changes in this mode. By exact dimension, you type the width in pixels (and, with "keep aspect ratio" checked, the height is calculated automatically from it, without distorting the image).

Unchecking "keep aspect ratio," width and height apply exactly as typed, even if that stretches the image — a deliberate option for the rare cases where a system requires a specific ratio that isn't the original image's. For most uses, that's not what you want: if you need a different ratio without stretching anything, the right move is to crop the image to the desired ratio first, then upscale afterward.

Dimension presets

Below the width and height fields there are shortcuts for a few common widths: 1000 px (a typical minimum on marketplaces and catalogs), 1080 px (the standard square post size on social media), 1500 px (a common requirement for ads or e-commerce listings), and 2480 px (the width of a portrait letter-size sheet at 300 DPI, for printing). Clicking a preset fills in the width with that value and keeps the original ratio — the final height depends on your image's ratio, it isn't locked to the preset's value.

Why the resize happens in steps

Upscaling an image in a single very large jump — going straight from 1x to 4x, say — produces a noticeably softer result than the same final enlargement done in two or three smaller stages, each up to 2x, even using the same best-quality resampling available in the browser both times. So whenever the requested enlargement goes above 2x, the tool automatically splits the work into those smaller stages before reaching the final size — with no extra configuration on your part.

Batch mode with the same setting

When more than one image is uploaded at once, the same scale or dimension setting applies to all of them, processed one at a time. If any image in the batch is already equal to or larger than the target size, it's flagged as such in the result and left unchanged — this tool increases resolution, it never reduces it, even if the chosen setting would have resulted in that for a specific file in the queue.

What this tool doesn't do

It doesn't recover lost detail, doesn't remove blur, doesn't use AI, and doesn't change the image's content beyond its pixel count — no cropping, no added elements, no color adjustments. If the goal is to shrink a file's size in KB, the "Reduce image size" tool (linked below the result on this page) handles that. If the goal is to change the visible area or the ratio of the image before upscaling, the "Crop image" tool does that cropping first.