Is this image resizer private? Do you upload my photos?+
Nothing is transmitted to a server. Your image is drawn onto a canvas element at the target pixel dimensions entirely within this browser tab. The original file stays on your disk and is read only by your own browser.
How do I resize to exact pixel dimensions or by percentage?+
Type the target width and height in pixels directly into the inputs — the aspect ratio lock adjusts the other axis automatically when enabled. For proportional scaling, use the quick-resize buttons (25%, 50%, 75%, 150%, 200%) which compute both dimensions from the original in one click.
Does resizing preserve the original file format?+
PNG files are exported as PNG to preserve transparency. Every other format — JPG, WebP, GIF — is exported as JPEG, since Canvas can't guarantee round-trip fidelity for all input types. If you need a WebP output, convert the result with the Image Converter tool after resizing.
Can I resize images without losing quality?+
Downscaling to a smaller canvas always involves merging pixels, so very fine detail may soften. The browser uses its built-in bilinear resampling, which gives clean results for photos. Upscaling adds pixels where none existed, so the result will look softer than a native high-resolution source.
What is the maximum file size or image dimension this tool handles?+
There is no enforced file size cap — the limit is your browser's available memory. Very large source images (above 20 MP or ~50 MB) may cause the browser to slow down or fail silently on lower-powered devices. If that happens, try closing other tabs to free memory.
Does it preserve aspect ratio, and how does the lock work?+
When aspect ratio is locked (the default), changing the width recalculates the height automatically using the original ratio, and vice versa. Unlock it by clicking the padlock icon between the two inputs — then width and height are independent, letting you stretch the image to any non-proportional dimensions.
Does this tool work offline?+
Yes. Once the page has loaded in your browser, no network connection is needed. Resizing runs on the canvas element using your device CPU, so it works on a plane or anywhere without internet.
How does it handle transparent PNG backgrounds?+
PNG transparency is preserved in the output. The canvas is not filled with a background color before drawing, so transparent areas in the original appear as transparent pixels in the resized PNG. If you resize a transparent PNG and then convert to JPEG, transparent areas will appear white, since JPEG has no alpha channel.