Image Resizer.

No, this tool never uploads your image anywhere. When you choose a file, your browser reads it locally and draws it onto an HTML canvas element, a built-in browser feature designed exactly for this kind of in-browser image manipulation, and all the resizing math happens using your own device processing power. The resized result is generated as a data URL directly in your browser memory, which is what the preview and the download link use, and at no point does the original or resized image travel over the network to any server, ours or anyone else. This matters particularly for product photos, personal images, or any picture you would rather not hand over to an unknown third-party website, which is a common concern with many free online image tools that quietly upload and sometimes retain a copy of whatever you submit.

Resizing by exact pixels lets you specify a precise target width and height, for example exactly 1200 by 900 pixels, which is the right choice when a specific platform or form has a stated pixel requirement, such as a marketplace listing that expects images no wider than 1200 pixels or a banner slot needing an exact 1920 by 480 pixel size. Resizing by percentage instead scales the image relative to its own original size, for example telling it to become 50 percent of its current dimensions, which is useful when you just want to shrink or enlarge an image proportionally without calculating exact target pixels yourself, particularly convenient when you are processing several differently-sized images and want them all reduced by the same relative amount rather than forced to one fixed pixel size. Choose exact pixels when a specific size requirement exists, and percentage when you simply want a proportional scale-down or scale-up.

Locking the aspect ratio keeps the original proportion between an image width and height intact as you resize it, so a photo that started as a natural rectangle stays a correctly proportioned rectangle at the new size rather than being stretched wider or squashed shorter than it should be. When the aspect ratio is unlocked and you set a width and height that do not match the original proportion, the resulting image will look visibly distorted, faces can appear elongated or squashed, straight lines can bend, and logos or text within the image can look obviously wrong. This tool locks the aspect ratio by default and automatically recalculates the height whenever you change the width, or the width whenever you change the height, so the image never accidentally gets stretched unless you deliberately uncheck the lock, which is only useful in the rare case where you genuinely need to force an image into a specific non-native aspect ratio and accept some visual distortion as a trade-off.

JPG is generally the best default choice for photographs, since it compresses photographic detail efficiently and produces a much smaller file size than PNG for the same image, which matters for faster website loading and for platforms with upload size limits; the trade-off is that JPG does not support transparency and uses lossy compression, meaning some fine detail is discarded to achieve the smaller file. PNG is the right choice specifically when you need a transparent background, for example a logo or an icon meant to sit over different colored backgrounds, since PNG preserves transparency exactly, though at the cost of a noticeably larger file size than JPG for the same image dimensions. WebP is a more modern format that typically achieves the smallest file size of the three for equivalent visual quality and does support transparency, making it attractive for web use, but it is worth confirming the specific platform or form you are uploading to actually accepts WebP files before relying on it, since some older systems and marketplaces still expect only JPG or PNG.

Reducing an image dimensions, making it smaller in width and height, generally preserves visual quality quite well for most purposes, since you are simply representing the same picture with fewer pixels, which is usually imperceptible at normal viewing sizes on a website, social post, or marketplace listing. Increasing an image dimensions beyond its original size, however, does reduce apparent sharpness, since the tool has to invent new pixel detail that was not present in the original photo, which can make an enlarged image look softer or slightly blurry compared to the source. Additionally, if you resize and then save as JPG, some compression is applied during the save step itself, which can introduce a small amount of quality loss depending on the compression level, though this tool uses a reasonably high quality setting by default to keep that loss minimal. For the best results, always start from the highest-resolution original you have available and resize down to your target size rather than resizing up from an already-small image.

There is no hard-coded limit built into this tool itself, since it relies on your own browser and device memory to load and process the image using the canvas element, which means the practical maximum depends on your specific device capability, the amount of available memory, and the browser you are using, rather than any restriction we impose. In practice, typical smartphone photos and standard camera images, generally in the range of a few megapixels up to around twenty or so, process comfortably and quickly on most modern phones, tablets and computers. Extremely large files, such as multi-hundred-megapixel scans or unusually large uncompressed images, may load more slowly or, on lower-memory devices, occasionally fail to process, in which case reducing the image size first with your phone or camera own export settings before uploading it here is a reasonable workaround. For the vast majority of everyday use cases, product photos, profile pictures, and marketing images, this tool handles the file sizes people typically work with quickly and without any issue.

Not in a single batch operation; this tool is built to resize one image at a time, so if you need to resize several photos to the same dimensions, you will repeat the choose, set dimensions, and download steps for each image individually. While this takes a bit more time than a true batch tool, the process for each individual image is quick, typically a few seconds from upload to download, and because your settings, the resize mode, target dimensions, aspect ratio lock and output format, stay as you left them between images, resizing a handful of photos to the same size in sequence is still a fast, straightforward workflow. If you regularly need to resize large batches of images to identical dimensions as part of an ongoing catalogue or content workflow, a dedicated batch image processing tool or software may serve that specific need better, but for occasional or moderate volume resizing, working through images one at a time here, with no upload and no privacy concern, remains a practical and genuinely free option.