How to resize an image
Upload
Drop a JPG, PNG, or WebP into the box above — or click to browse your files. The image is read locally; nothing is uploaded.
Set dimensions
Type exact pixel values, or switch to Percent mode and pick a scale like 50%. The aspect-ratio lock stays on by default so nothing stretches.
Download
Hit "Resize & download" and save the new file. Repeat for as many images as you like — no sign-up, no limits.
Pixels vs. percent — which to use
Use pixels when the destination demands an exact size: profile pictures, blog hero images, ad banners, thumbnails — anywhere a platform publishes required dimensions. You get precision down to the single pixel, and the live "Output" line confirms exactly what you'll receive.
Use percent when you want a quick, proportional shrink without any math. 50% halves each side (and cuts the pixel count to a quarter), while 25% is a great default for web-ready photos. Percent mode is also the fastest route to smaller files: halving dimensions typically shrinks the file by roughly three-quarters, with barely any visible difference on screen. Precision or speed — either way, a warning appears if you push past the original size, so enlargements never happen by accident.
Resizing tips
- Keep the aspect lock on for photos. Turning it off stretches faces and circles — the fastest way to make an image look amateur.
- Downscaling is safe, upscaling softens. Shrinking 4000px to 1200px looks as sharp as the original on any screen; enlarging invents pixels, so going past 100% blurs fine detail.
- Resize before compressing. Fewer pixels to encode means a dramatically smaller JPG or WebP at the same quality setting — do this step first for the smallest files.
- Formats are handled for you. PNGs stay lossless PNGs (transparency preserved); photos are saved as high-quality JPEGs automatically.
- Handy social sizes: Instagram post 1080×1080, Instagram story / reels 1080×1920, X header 1500×500, YouTube thumbnail 1280×720.
- Export at 2x for crispness when a slot is small but people zoom — product photos and portfolio shots especially.
Common uses
Resizing is one of those everyday chores that quietly fixes a hundred small problems. Shrink phone photos before emailing them or uploading to forms with file-size limits. Fit images to your blog or CMS column width so layouts don't break on mobile. Prep product photos to identical dimensions for a tidy store grid. Make forum avatars and profile pictures that fit without auto-cropping your face. Downsize screenshots for documentation and support tickets. Or create exact-size assets for ads and social posts in one pass instead of wrestling with desktop software.