Resize Image
Change image dimensions in pixels or percentage — keep the aspect ratio or stretch freely, for web, print, or social profiles.
Drop an image here, or click to browse
Processed locally — nothing is uploaded
How to resize an image
Drag your image into the box above — it opens locally in your browser and is never uploaded anywhere. JPG, PNG, WebP, GIF, and BMP are accepted.
Enter the new width or height. By default the aspect ratio is locked, so the other side follows automatically; uncheck the box to stretch freely. The % field scales from the original.
Click Resize, then hit Download next to the result. For photographs, JPG at 85–92% quality is the sweet spot.
Know-how
Pixels vs percentage: when to use which
Use pixels when you need an exact dimension — a profile photo that must be 400×400, a banner that must be 1600×900, an ID photo with strict requirements. Use percentage when the target size is relative: shrinking a batch of photos by half (50%), or making an oversized email attachment roughly 30% smaller. A rule of thumb: if a platform or form demands a specific size, always use pixels. If you only care about 'smaller', percentage is faster and safer because you can never pick a number that accidentally enlarges the image.
Enlarging photos: what to expect
Shrinking an image is nearly lossless — you discard pixels nobody could see at the smaller size. Enlarging is the opposite: the computer has to invent pixels that were never captured, so fine detail softens. A 10–15% upscale is usually invisible; 50% looks noticeably softer; 2× or more gets visibly mushy. If you need a big print from a small file, resampling helps only so much — the honest fix is starting from a higher-resolution original or using a dedicated AI upscaler.
Pick the right export format
After resizing, the format you save in matters as much as the size. JPG at 85–92% quality is the sweet spot for photographs — files are small and the artifacts are invisible on screens. PNG is for graphics with sharp edges, text, or transparency: crisp, but several times larger than JPG for photos. WebP gives JPG-level quality at roughly two-thirds the file size and works everywhere modern; pick it when your platform accepts it. GIF and BMP are legacy formats — resize them, then save as one of the three modern formats instead.
Common mistakes to avoid
Three mistakes account for most bad resizes. First: resizing the same image up and down repeatedly — every pass rounds pixels, so quality degrades cumulatively. Resize once, from the original, and keep the original untouched. Second: trusting the display size — an image shown small on a page may still be a 12-megapixel file underneath; always check the actual dimensions, not how it looks. Third: assuming more DPI means better quality — for screens, DPI metadata changes nothing visible, it only matters for print workflows. Also avoid upscaling a JPG and re-saving it as JPG repeatedly: each re-encode adds artifacts.
Common sizes at a glance
Social avatars: 400×400 covers most platforms. Instagram feed: 1080×1080 square, 1080×1350 portrait, 1080×566 landscape. YouTube thumbnail: 1280×720. Blog and email images: 1200 pixels wide is a safe general-purpose width. Presentation slides: 1920×1080 for modern 16:9 screens. Print, roughly: a 4×6 inch photo wants about 1200×1800 pixels at 300 DPI, and A4 needs around 2480×3508. When in doubt, resize to the platform's published spec — every major platform documents its recommended image sizes, and matching them exactly is what keeps uploads sharp.
Marketplace image sizes: a practical cheat sheet
Typical product photo requirements: Amazon — at least 1,000 px on the longest side (zoom enabled at 1,600 px and above); eBay — at least 500 px, 1,600 px recommended for zoom; Shopify — square 2,048 × 2,048 px recommended; Shopee — at least 500 × 500 px; Taobao main image — 800 × 800 px or larger. Requirements change, so always confirm with your platform's latest guide. Type the exact pixels here and export — your photo lands on the platform ready to list.
Online tool vs desktop software: what image editing software do you need?
For everyday tasks — resizing, cropping, compressing, converting — a free online tool beats desktop software on almost every count: nothing to install, nothing to update, no storage taken, and it runs on any device with a browser. Professional image editing software still earns its place for heavy compositing, color grading, and print production. But when the job is simply getting a photo to the right pixel size right now, the browser wins on speed. Use this page for that work, and keep the heavyweight apps for the heavyweight jobs.