NanoImage HomeFree online image resizer. Resize by pixels, percentage, or target file size (KB/MB). JPG, PNG, WebP, GIF. No signup, 100% private.
NanoImage is a free image resizer that runs entirely in your browser — resize image online without uploading files or creating an account. Change width and height in pixels, scale by percentage, or use one-click presets for social posts and HD exports. Smaller dimensions and JPG/WebP quality often shrink file size; when you need an exact KB or MB target, follow up with our Compress Image tool. Your photos never leave your device.
Choose Pixels to set exact width and height, or Percentage to scale the whole image (for example 50% for half size). Turn on Keep aspect ratio so portraits and logos do not stretch. This covers everyday “how to resize an image” workflows in a few clicks.
Lowering resolution and output quality reduces weight — helpful for email limits or upload forms. For precise caps such as resize image to 50KB, resize image in KB, or resize image to 1MB, open Compress Image after resizing to hit an exact target without guesswork.
Resize image for Instagram (1080×1080 posts, 1080×1920 Stories), LinkedIn banner (1584×396) or profile (400×400), avatars at 512×512, thumbnails at 1280×720 or 1920×1080, and product photos for the web. Need bulk image resize? Use NanoImage CLI for folder batch jobs.
No. Resizing changes width and height. Cropping removes part of the image.
Keep aspect ratio enabled. This prevents the image from being stretched.
No. Basic resizing cannot create real detail. Large upscaling may look blurry.
Shrink dimensions (for example to 800 px wide or less), choose JPG or WebP output, and lower quality to about 40–55%. If you still need an exact cap, open Compress Image and set a 50 KB target.
The resize tool reduces file size indirectly by shrinking pixel dimensions or lowering quality. For precise file-size targets — such as resize image to 50KB or 1MB — use our Compress Image tool, which lets you set an exact output size in KB or MB.
Enter 512 in both the Width and Height fields. If your source image is not square, turn off "Keep aspect ratio" first, then click Apply. 512×512 is a common size for AI model training datasets, profile avatars, and app icons.
Click one of the presets in the "Common Sizes" section — 1920×1080 (Full HD) and 1280×720 (HD) are available with a single click. These resolutions are standard for YouTube thumbnails, presentations, desktop wallpapers, and video covers.
The current web tool processes one image at a time. For bulk image resizing of entire folders, try NanoImage CLI, which lets you batch resize images from the command line in a single command.
Instagram recommends 1080×1080 px for square posts, 1080×1350 px for portrait posts, and 1080×1920 px for Stories and Reels. Enter these values in the Width and Height fields to get the exact dimensions for each format.
LinkedIn profile photos work best at 400×400 px. For a LinkedIn banner, use 1584×396 px. Enter the target dimensions in the Width and Height fields and click Apply.
Yes. Choose PNG as the output format to preserve the transparent background. If you save as JPG, transparent areas will be filled with white, since JPG does not support transparency.
NanoImage runs entirely in your browser — no file uploads, no account, and no limits. It supports JPG, PNG, WebP, and GIF, and lets you resize by exact pixels, percentage, or one-click presets like HD (1280×720) and Full HD (1920×1080). Pair with Compress Image when you need an exact KB or MB output.
Usually yes. Smaller pixel dimensions generally produce a smaller file. However, the final file size also depends on the output format and quality setting. Use JPG or WebP for the smallest output; use PNG when you need to keep transparency.