Image Resizer
Resize images by pixels or percentage. Runs in your browser.
About this image resizer
This image resizer changes the width and height of your pictures in pixels or by percentage. Resize one photo or a whole batch at once, then download the results individually or as a ZIP file.
You decide how the shape is handled. Keep the aspect ratio so nothing is distorted, crop to fill an exact size such as a 1080 by 1080 Instagram square, or stretch to the exact numbers if that is what you need.
Resizing happens in your browser. Your photos are never uploaded, there is no account to create, and there is no watermark on the result.
Features
Resize by pixels or percent
Type an exact width and height, or scale every image from 5 to 300 percent with a slider.
Three resize modes
Keep ratio fits the image inside your size without distortion. Crop to fill gives an exact size and trims the edges evenly from the center. Stretch forces the exact size.
Ready-made social media sizes
Presets fill in the right dimensions for Instagram posts and stories, Facebook posts and covers, X posts and headers, YouTube thumbnails, LinkedIn banners and common video sizes.
Batch resizing with ZIP download
Drop many images at once. Each one is resized with the same settings and named with its new size, such as photo-1080x1080.jpg.
Sharp downscaling
Large reductions are done in several halving steps, which keeps edges and fine detail crisper than a single jump.
Choose the output format
Keep the original format or save as JPG, PNG or WebP, with a quality slider for JPG and WebP. AVIF is offered when your browser can save it.
Upright phone photos
The tool reads the photo's orientation tag first, so portrait shots from your phone are measured and saved the right way up.
How to use the image resizer
- 1Add one or more images.
- 2Enter a size or percentage, or pick a preset, and choose Keep ratio, Crop to fill or Stretch.
- 3Download each image or all as a ZIP.
When to use it
Social media posts
Pick a preset such as Instagram portrait (1080 by 1350) and every photo is cropped and scaled to fit exactly.
Online store product photos
Marketplaces often want square images of a set size. Resize a whole product shoot to 2000 by 2000 in one go.
Website and blog images
Bring camera photos down to 1600 or 1920 pixels wide so pages load quickly without looking soft.
Application and ID forms
Forms sometimes ask for a photo of an exact pixel size. Enter the numbers and choose Crop to fill to match them.
Presentations and documents
Scale screenshots down by 50 percent so they fit slides and keep the file small.
Aspect ratio explained
The aspect ratio is the shape of an image, written as width to height. A typical phone photo is 4:3, a widescreen video frame is 16:9 and an Instagram square is 1:1.
When the shape of your target matches the shape of your image, resizing is simple. When it doesn't, something has to give. You can keep the whole picture and accept a different size (Keep ratio), keep the exact size and lose some of the edges (Crop to fill), or keep both and accept distortion (Stretch).
How resizing affects quality
Making an image smaller removes pixels, but the result usually looks just as sharp because screens show it at a smaller size too. It is the safest kind of resize.
Making an image larger has to invent pixels that were never captured. The browser blends neighboring pixels, so enlarged images look softer the more you scale them. Turn on Don't enlarge smaller images if you want to make sure nothing is ever scaled up.
File format also plays a part. JPG and WebP at a quality of 85 to 90 keep detail well. PNG keeps every pixel but makes much larger files for photos.
Pixels, DPI and print size
Screens care only about pixels. A 1200 pixel wide image fills the same space on a web page no matter what DPI value is stored in the file.
Print size depends on both. To print at good quality you need about 300 pixels per inch, so a 6 by 4 inch print needs roughly 1800 by 1200 pixels. This tool works in pixels, so use that rule to choose your numbers.
Why use Mavros
| Mavros | Typical upload sites | |
|---|---|---|
| Where files are processed | In your browser, on your device | Uploaded to a remote server |
| Batch resizing | Included, with ZIP download | Often limited or on a separate paid page |
| Crop to an exact size | Crop to fill mode and social presets | Often stretches or needs a separate crop tool |
| Account or sign-up | Not needed | Sometimes required to download |
| Watermark | Never | Sometimes added on free plans |
Tips
- Leave one of the size boxes empty in Keep ratio mode and the tool works out the other side for you. The placeholder shows the value it will use.
- Resize first, then compress. A smaller image almost always gives a bigger saving than a lower quality setting.
- For web images, 1920 px is enough for full-width banners and 1200 px is plenty for most content images.
- Use Crop to fill for profile pictures and thumbnails, where an exact size matters more than the edges.
- Keep your original files. Each time you shrink and enlarge a picture again, it loses detail.
Questions
How do I resize an image without stretching it?
Use the Keep ratio mode. Enter a width, a height, or both, and the image is scaled to fit inside that size while keeping its shape.
How do I resize a photo to an exact size like 1080 by 1080?
Enter both numbers and choose Crop to fill, or pick the Instagram square preset. The photo is scaled to cover the square and the extra edges are trimmed evenly.
Will resizing reduce the quality?
Making an image smaller keeps it sharp. Making it larger than the original adds pixels that weren't there, so it may look soft.
Can I resize many images at once?
Yes. Add as many files as you like. They all use the same settings, and you can download them together as a ZIP file.
How do I make an image smaller in KB?
Reducing the pixel size is the fastest way to cut the file size. Choose JPG or WebP and lower the quality a little for an extra saving. For more control, use the Image Compressor.
What sizes do the presets use?
Instagram square 1080×1080, portrait 1080×1350 and story 1080×1920. Facebook post 1200×630 and cover 851×315. X post 1600×900 and header 1500×500. YouTube thumbnail 1280×720. LinkedIn banner 1584×396. Plus 720p, 1080p and 4K.
Is there a maximum size?
You can enter up to 20,000 pixels a side. Browsers limit canvas size, so very large results are reduced to about 16.7 megapixels, and the file row tells you when that happens.
Are my photos uploaded?
No. The resizing runs in your browser, and your images never leave your device.