Resize Image
Resize any JPG, PNG, or WebP to exact pixel dimensions or a percentage — with aspect ratio locked if you want it. Runs entirely in your browser.
Image Resizer
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Resize Photos and Images to Any Size
Whether you need an avatar at exactly 400×400, a banner at a specific width, or a photo shrunk to upload faster, this tool resizes JPG, PNG, and WebP images to precise pixel dimensions. Tick Keep aspect ratio and set just the width (or height) and the other dimension is calculated for you, so nothing gets stretched.
Resizing is done on an HTML canvas in your browser. Everything runs on your device via open-source browser libraries — your file is never uploaded. You can verify it yourself.
Frequently Asked Questions
Leave Keep aspect ratio ticked and set only one dimension — the other is computed automatically to keep the proportions correct.
Yes. Pick JPG, PNG, or WebP as the output, or keep the original format. WebP usually gives the smallest file at the same quality.
Making an image smaller is clean. Enlarging beyond the original size will look softer, since the tool cannot invent detail that was not captured.
No — resizing happens entirely in your browser. The image never leaves your device.
Pixels determine detail; file size is only the consequence
Resizing changes pixel dimensions. Compression changes how efficiently those pixels are stored. Decide the required dimensions first and optimise quality second.
Work backwards from display size
A 1200-pixel-wide image is normally sufficient for a 600 CSS-pixel slot on a high-density screen. Supplying a 5000-pixel camera original wastes bandwidth without adding visible detail. For email or forms, follow the portal’s stated maximum dimensions rather than guessing from megabytes alone.
Avoid accidental distortion
Keep aspect ratio locked unless the destination specifies an exact crop. Forcing a 4:3 image into a square by changing width and height independently stretches faces and circular objects. Crop to the target shape first, then resize the cropped result.
Upscaling has limits
Making a small image larger creates new pixels by interpolation; it cannot recover missing texture or readable text. Modest enlargement can be useful for layout, but screenshots and scanned documents should be captured again at higher resolution when accuracy matters.
Resolution guidance updated 11 July 2026 · Review methodology