Exact pixel sizes
Hit the dimensions a marketplace, CMS or application form asks for, such as 1200 x 800.
Free
Image Resizer
Resize images by exact dimensions or by percentage while maintaining quality. Works in your browser, one image or a whole batch.
Resize mode
100%
10%300%
Images
Your images will appear here
Choose a size, add images and resize. Each file shows its new dimensions.
This image resizer changes the width and height of your images in the browser. Type exact pixel dimensions with the aspect ratio locked, or scale everything by a percentage from 10% to 300%. Resize one photo or a whole batch, then download the results. Nothing is uploaded, and there is no sign up or watermark.
Resizing is the quickest way to cut a large photo down for a website, a form or an email. If the file is still too big afterwards, run it through the image compressor. To cut off part of the picture instead of scaling all of it, use Crop Image, and to enlarge a small photo with real added detail, try the AI Image Upscaler.
How to use Image Resizer
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1
Choose a resize mode
Pick By dimensions to type an exact width and height in pixels, or By percentage to scale by 10% to 300%.
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2
Add your images
Click Add images and select one or more files. The width and height fields fill in with the first image size, and the aspect ratio lock keeps it in proportion.
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3
Resize and download
Press Resize Images. Each file shows its new dimensions and size; download them one by one or with Download All.
What you can make
Social media images
Prepare posts, profile photos, cover images and banners at the size each platform expects.
Faster websites
Scale 4000-pixel phone photos down to web sizes so pages load quickly.
Smaller email attachments
Halving the width and height leaves a quarter of the pixels, so the file gets much smaller.
Batch resizing
Resize a set of product images or screenshots with one percentage in a single pass.
Private by design
Resizing runs on your device, so your photos are never uploaded.
Slides and documents
Smaller images keep presentations and PDFs light and quick to share.
ID and profile photos
Resize portraits to the pixel size an online form or profile requires.
Resize by pixels or by percentage
The image resizer has two modes, and each suits a different job:
- By dimensions: enter a width and height in pixels. With Maintain aspect ratio ticked, changing one field updates the other so the picture is not stretched. Untick it only when you really need an exact size such as a square, and accept that the image will be squeezed or stretched to fit.
- By percentage: move the slider between 10% and 300%. Every image in the batch is scaled by the same amount and keeps its own proportions, which makes this the best choice for a batch of photos with different shapes.
In dimensions mode, the same width and height are applied to every image in the batch, and the aspect ratio is based on the first image you add. If your photos are a mix of portrait and landscape, resize them by percentage, or resize them in separate batches.
Which mode fits your task? Use dimensions when a site gives you an exact requirement, for example "images must be 1080 x 1080" or "maximum width 1600 pixels". Use percentage when you simply want everything smaller, for example 50% to turn 4000-pixel phone photos into 2000-pixel ones that are easy to email.
Tips for sharp results
Making an image smaller almost always looks good. Making it bigger is different: a resizer can only stretch the pixels that are already there, so enlarging a photo to 200% or 300% makes it softer and more blurred.
- To enlarge a small or low-resolution photo, use the AI Image Upscaler, which adds real detail instead of stretching pixels.
- For a fixed shape like a square profile picture, crop the photo to the right shape first, then resize it. That avoids distortion.
- After resizing, run the files through Compress Image if you still need a smaller file size.
- JPG output is saved at high quality (90%), and PNG and WebP files keep their format, so transparent PNGs stay transparent.
Resized files keep the original file name with _resized added, so they do not overwrite your originals.
Resizing runs in your browser using the canvas, so your images are not uploaded and there is no file size limit set by RegiAI. Big batches of large photos depend on your device memory; if a phone struggles, resize fewer images at a time.
If you resize a photo more than once, start from the original each time. Shrinking an already shrunk copy and then enlarging it again loses detail at every step.
Common image sizes
A few sizes that come up often, in pixels (width x height):
- Full HD, slides and YouTube thumbnails: 1920 x 1080 or 1280 x 720 (16:9).
- Square social posts: 1080 x 1080.
- Portrait social posts: 1080 x 1350.
- Blog and website images: 1200 to 1600 pixels wide is usually enough.
- Email: 800 to 1200 pixels wide keeps photos readable without huge attachments.
Platforms change their recommendations from time to time, so check the current guidance for the site you are uploading to. Need a new YouTube thumbnail rather than a resized one? Try the AI Thumbnail Generator.
Print is different from screens. For a sharp print, aim for about 300 pixels per inch: a 6 x 4 inch photo needs roughly 1800 x 1200 pixels, and an A4 page about 2480 x 3508. Scaling a small image up to print size will not add real detail, so start from the largest original you have or use the AI Image Upscaler.
If your image is the right size but the wrong shape, for example a portrait photo for a landscape banner, the AI Image Expander can extend the edges instead of cropping or stretching.
Image Resizer FAQ
Still stuck? Contact us.
How do I resize an image?
Choose By dimensions or By percentage, add your images, set the size and press Resize Images. Then download each file or use Download All.
Is this image resizer free?
Yes. It is free with no sign up, no watermark and no limit on the number of images.
Are my images uploaded?
No. Resizing happens in your browser, so your images never leave your device.
How do I resize an image without stretching it?
Keep Maintain aspect ratio ticked in dimensions mode, or use percentage mode. Both keep the original proportions.
Can I resize multiple images at once?
Yes. Add as many images as you need. In percentage mode each keeps its proportions; in dimensions mode they all get the same width and height.
What is the largest size I can set?
The width and height fields go up to 5,000 pixels, and percentage mode goes up to 300%. Very large results depend on your device memory.
Which formats are supported?
JPG, PNG and WebP work best, and the resized file keeps the same format. For HEIC photos, use the HEIC to JPG converter first.
Will resizing reduce quality?
Scaling down keeps images sharp. Scaling up makes them softer because no new detail is added; use the AI Image Upscaler to enlarge photos properly.
Does resizing reduce file size?
Yes, making an image smaller in pixels reduces the file size. For even smaller files, also use the image compressor.
How do I make a square image?
Crop it to a square with Crop Image first, then resize it here. Resizing a rectangle straight to a square would distort it.
Can I resize images on my phone?
Yes. The resizer works in mobile browsers on iPhone and Android.
Does Download All create a ZIP?
No. Each resized image downloads as a separate file with _resized added to its name.
How do I resize an image to a specific file size, like under 1 MB?
Resize it smaller in pixels first, for example to 1600 pixels wide, then use the image compressor to fine-tune the file size.
Can I enlarge an image?
Yes, up to 300% in percentage mode. The result will be softer. For a sharper enlargement, use the AI Image Upscaler.