QuickMergeOn-device resizing — the selected image is not sent to a QuickMerge processing server.
Resize Image Online — Increase or Reduce Picture Size
Short answer: To resize an image, enter the target pixel dimensions or a percentage, preserve the aspect ratio when needed, then export it. QuickMerge resizes images in your browser without uploading them.
Enlarge a picture or shrink it: enter exact pixel dimensions or a percentage, keep the aspect ratio locked, and download JPG, PNG or WebP. The whole resize happens on your own device.
- Free to use
- No sign-up
- Exact pixel entry
- Runs in your browser
- No uploads
How do I resize an image to exact dimensions?
Drag & drop here
or click to browse
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.
Next steps
Related tools
- change the framing, not just the size — when the aspect ratio is wrong.
- convert a JFIF before resizing — if the file came off a camera or an email attachment.
What to do with the result
- compress after resizing — the two together get you under most upload limits.
- remove EXIF data — before posting the resized image.
Browse all image tools, or see every QuickMerge tool.
No completed size benchmark is published for this tool. See measurement coverage and limitations; stated upload limits are application guards, not tested device capacity.
Frequently Asked Questions
Load the image, untick nothing, and type a larger width — the height follows automatically while Keep aspect ratio is on — then download. Enlarging cannot add detail the original never captured, so treat roughly 200% of the source width as the point beyond which softening becomes obvious on screen.
It can. Resizing up spreads the pixels you have over a bigger grid and the browser interpolates the gaps, so fine detail softens. Starting from the largest original you have, rather than from a copy that has already been shrunk or forwarded through a chat app, makes far more difference than any setting here.
No. The image is read from your device, resized on a canvas in the page and downloaded from the page. Nothing is transmitted, and there is no account to create.
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.
Match the required pixel dimensions
Start from the receiving service’s width, height and file-size requirements.
Pixels and print size
For a 6 × 4 inch print at 300 pixels per inch, the target is 1800 × 1200 pixels. Confirm the printer’s requested resolution. Enlarging a small source adds pixels but cannot recover missing detail.
Keep the intended proportions
Use proportional resizing when every edge must remain visible. When the required shape differs, crop to that aspect ratio first. Entering unrelated width and height values can stretch the subject.
Check each saved image
Reopen the download and inspect its dimensions and small details. For several images, repeat the settings and check each output; differing source proportions can require different crops.