Image Resizer
Resize and compress images for social media, web, and more. Free and private.
Drop an image here or click to upload
Supports JPEG, PNG, WebP, GIF, BMP, and SVG
Resize and compress images for social media, web, and more. Free and private.
Drop an image here or click to upload
Supports JPEG, PNG, WebP, GIF, BMP, and SVG
Each social media platform has specific image dimension requirements for different placements. Instagram posts work best at 1080x1080 pixels for square format, while Stories and Reels use 1080x1920 (9:16 vertical). Facebook cover photos need 820x312 pixels on desktop, though they display at 640x360 on mobile. Twitter (X) header images are 1500x500, and profile images are 400x400.
LinkedIn company page banners require 1584x396 pixels, while personal profile backgrounds use 1584x396 as well. YouTube thumbnails perform best at 1280x720 (16:9 aspect ratio) with a minimum width of 640 pixels. Getting these dimensions right ensures your images display without cropping or distortion, maximizing visual impact on every platform.
Image file size directly impacts page load speed, which affects both user experience and search engine rankings. Google considers Core Web Vitals, including Largest Contentful Paint (LCP), as ranking factors. Unoptimized images are the most common cause of slow LCP scores.
A good rule of thumb is to serve images at the exact dimensions they are displayed at, never larger. A hero image displayed at 800px wide does not need to be uploaded at 3000px wide. Reducing dimensions to the actual display size can cut file size by 90% or more. Combine dimension reduction with quality adjustment (80-85% JPEG quality is visually indistinguishable from 100% for most photos) to achieve optimal file sizes without visible quality loss.
JPEG is the standard format for photographs and complex images with many colors and gradients. It uses lossy compression, meaning some data is discarded to reduce file size. At 80-85% quality, the visual difference is nearly invisible. JPEG does not support transparency.
PNG is ideal for images that need transparency, sharp edges, or text overlays. It uses lossless compression, so no data is lost, but file sizes are typically larger than JPEG for photographs. PNG excels for logos, icons, screenshots, and graphics with flat colors.
WebP, developed by Google, offers both lossy and lossless compression with superior file sizes compared to both JPEG and PNG. WebP images are typically 25-35% smaller than equivalent JPEGs and support transparency. All modern browsers now support WebP, making it an excellent choice for web images where file size matters.
Modern websites serve different image sizes to different devices. A desktop visitor might need a 1200px wide hero image, while a mobile visitor only needs 400px. Serving the full-size image to mobile wastes bandwidth and slows the page.
The HTML srcset attribute lets developers specify multiple image sizes and let the browser choose the best one. A common approach is to create variants at 400px, 800px, 1200px, and 1600px widths. This tool makes it easy to generate each size from a single source image. Combined with lazy loading (loading="lazy" attribute), responsive images can reduce total page weight by 50-70% compared to serving a single large image to all devices.
Yes, completely free with no limits. All image processing happens directly in your browser using the HTML Canvas API. Your images never leave your device. No data is uploaded to any server, no account is required, and there are no watermarks on the output. Close the tab and everything is gone.
You can upload any image format supported by your browser, including JPEG, PNG, WebP, GIF, BMP, and SVG. The tool reads the image using the browser's native image decoder, so if your browser can display it, this tool can resize it. Output formats available are JPEG, PNG, and WebP.
For most use cases, 80-85% quality provides the best balance between file size and visual quality. At these levels, compression artifacts are virtually invisible in photographs. Below 70%, you may start to notice blocky artifacts around edges and text. For archival or print purposes, use 95-100%. For web thumbnails where file size matters most, 60-70% is often acceptable.
Scaling an image down generally preserves visual quality because the browser averages neighboring pixels together. Scaling up, however, requires the browser to interpolate (guess) new pixel values, which can result in a softer or blurrier image. For best results, start with the largest version of your image and scale down to the sizes you need rather than scaling up from a small source.
JPEG at 80-85% quality is the safest choice for social media because every platform accepts it and the files are compact. PNG is better if your image has text overlays, logos, or needs transparency. WebP produces the smallest files but some older social media platforms may re-encode it as JPEG during upload. When in doubt, JPEG is the most universally compatible option.