Image Resizer
Resize any image to exact pixel dimensions or a percentage, with aspect-ratio locking and one-click presets for the sizes social platforms expect.
About the Image Resizer
Dimensions are the most wasteful thing about most images on the web. A phone photograph is commonly 4032 pixels wide; the space it occupies in a blog post is often 800. The browser dutifully downloads all four thousand pixels' worth of data and then throws three quarters of them away during rendering. Resizing before upload is the single most effective image optimisation available, and unlike quality compression it costs nothing visually as long as you stay above the display size.
There is a second reason to resize, which is that platforms have opinions. A LinkedIn banner is 1584 × 396. A YouTube thumbnail is 1280 × 720. An Open Graph share image is 1200 × 630. Get these wrong and the platform crops your image somewhere unhelpful, usually straight through a face or a logo. Presets remove the guesswork.
This resizer offers both exact pixels and percentage scaling, with an aspect-ratio lock that keeps proportions correct while you type in one dimension. Resampling is done with the browser's own high-quality image smoothing, and the result is available as JPEG, PNG or WebP. As with every image tool here, the picture is drawn to a canvas in your own browser and never sent anywhere.
How to use it
- Load an imageDrag and drop or click to browse. The original dimensions and file size are shown as soon as it loads.
- Choose pixels or percentageEnter exact width and height, or scale by percentage when you just want “half the size”.
- Keep or unlock the aspect ratioWith the lock on, typing a width fills in the matching height automatically so nothing is stretched.
- Or pick a presetOne click applies a common size — HD, Full HD, square post, story, YouTube thumbnail, Open Graph card or profile picture.
- Set the output formatSave as JPEG, PNG or WebP, with a quality control for the lossy formats.
- DownloadThe resized copy is saved to your device; the original file is untouched.
Features
- Exact pixel controlType the precise width and height you need, down to the pixel.
- Percentage scalingScale to 25%, 50%, 75% or any custom percentage of the original.
- Aspect ratio lockProportions are maintained automatically so images never come out stretched or squashed.
- Platform presetsInstagram square and story, YouTube thumbnail, Open Graph card, LinkedIn banner, HD and Full HD.
- High quality resamplingUses the browser's smoothing for clean downscaling instead of a blocky nearest-neighbour result.
- Format and quality outputExport as JPEG, PNG or WebP with an adjustable quality setting.
Who uses this tool
- Web publishersMatch images to the width they are actually displayed at, cutting page weight without any visible change.
- Social media managersProduce correctly sized posts, stories, thumbnails and banners so platforms stop cropping them badly.
- Online sellersMeet the exact pixel requirements marketplaces publish for product images.
- Job applicants and form fillersResize a photo to fit a portal's strict dimension and file-size rules without any software.
Tips worth knowing
- Never upscale a small image expecting more detail — enlarging invents pixels and produces softness. Resize down, not up.
- Serve images at roughly twice their CSS display width for high-density screens: an 800px slot looks sharpest fed a 1600px image.
- Resize first, then compress. Doing it in that order gives the encoder fewer pixels to work with and produces a smaller, cleaner file.
Frequently asked questions
Will resizing make my image blurry?
Reducing size will not — downscaling averages pixels together and usually looks crisp. Enlarging will, because the extra pixels have to be invented by interpolation. If you need a larger image, always go back to a higher-resolution original.
What size should a blog featured image be?
1200 × 630 is the safest single answer: it satisfies Open Graph and Twitter Card requirements for link previews and is wide enough for full-width layouts on most themes without being wasteful.
How do I resize an image to a specific file size in KB?
Resize the dimensions here first, then run the result through the Image Compressor and move the quality slider until the reported size is under your target. Dimensions and quality together determine file size.
Does the aspect ratio lock work in both directions?
Yes. With the lock on, changing either width or height recalculates the other so the proportions stay exactly as they were in the original.
Which output format should I choose?
WebP for the web, JPEG for maximum compatibility with older software, PNG whenever the image has transparency or contains text, screenshots or flat-colour graphics.
Is my photo uploaded when I resize it?
No. The image is decoded and redrawn on a canvas inside your browser. Nothing is transmitted, which is why the tool works at the same speed regardless of your connection and is safe for private photos.