Image Resizer & Dimension Scaler
Live canvas visual preview, exact pixel dimensions, percentage scaling, and social media presets. 100% in browser.
Drop your photo here or click to open
Supports PNG, JPG, WebP, AVIF, and SVG. Exact pixel dimensions & aspect scaling.
Pixel & Percentage Resizing
Resize by exact pixel dimensions, scale percentages, or quick social media presets with automatic aspect ratio lock.
2026 Social Media Presets
Instant one-click dimensions for Instagram Posts, Stories, YouTube Thumbnails, Twitter/X Headers, and LinkedIn Banners.
100% Client-Side Privacy
Zero cloud uploads. All resizing and interpolation happen in your local browser sandbox with zero privacy risk.
Official Social Media & Web Dimensions Cheat Sheet
Always publish crisp, uncropped images with verified pixel resolutions across Instagram, YouTube, Twitter/X, and LinkedIn.
| Platform | Placement Type | Target Resolution | Aspect Ratio | Optimization Advice |
|---|---|---|---|---|
| Square Post (1:1) | 1080 × 1080 px | 1:1 Square | Standard feed image, sharpest on retina screens | |
| Portrait Post (4:5) | 1080 × 1350 px | 4:5 Portrait | Maximizes vertical screen estate on mobile feeds | |
| Instagram & TikTok | Story / Reel (9:16) | 1080 × 1920 px | 9:16 Fullscreen | Full bleed mobile view, keep text within 250px margins |
| YouTube | Video Thumbnail (16:9) | 1280 × 720 px | 16:9 Landscape | Minimum 640px wide, max file weight under 2MB |
| YouTube | Channel Header Banner | 2560 × 1440 px | 16:9 Canvas | Desktop/mobile safe zone: 1546 × 423 px in center |
| Twitter / X | Header Banner | 1500 × 500 px | 3:1 Ultrawide | Allow for profile avatar overlap in bottom-left corner |
| Twitter / X | In-Stream Post | 1200 × 675 px | 16:9 Landscape | Prevents auto-cropping in desktop and mobile feeds |
| Feed Post & Link Preview | 1200 × 630 px | 1.91:1 Ratio | Standard OpenGraph preview image for social shares | |
| Company Cover Banner | 1584 × 396 px | 4:1 Ultrawide | Professional high-resolution corporate banner | |
| Official ID / Visa | Passport Photo (2x2 in) | 600 × 600 px | 1:1 Square | 300 DPI print standard for visa & government forms |
Precision Image Resizing Features
Maintain Aspect Ratio Lock
Locking the aspect ratio prevents awkward stretching or squishing when resizing images. When you enter a new width, 7xm automatically calculates the proportional height with pixel-perfect mathematical precision.
Scale by Percentage (25% to 500%)
Need to reduce an entire batch of high-resolution 4K camera photos to 50% for quick email sharing? Percentage mode scales all loaded images proportionally regardless of their individual original dimensions.
High-Quality Bicubic Interpolation
7xm uses hardware-accelerated bilinear and bicubic image smoothing filters when downsampling or upscaling, ensuring text remains sharp and subtle color gradients do not produce pixelated staircases.
E-Commerce Uniform Product Grids
Standardize all your Shopify, Amazon, or WooCommerce product catalog photos to uniform 1000x1000 square dimensions for a clean, professional store aesthetic that converts visitors into customers.
How to Resize Images Online for Free
Upload Images
Add single or multiple PNG, JPG, or WebP files by dropping them into the upload box or clicking 'Select Images'.
Set Dimensions or Preset
Enter custom width & height, choose a percentage scale, or click a verified 2026 social media preset.
Download Resized Files
Inspect the instant live preview canvas and download single images or a packed ZIP archive in one click.
Frequently Asked Questions (Image Resizer)
Clear answers on pixel scaling, social media formats, and aspect ratio handling.
QWill resizing an image reduce its visual quality?
QHow do I resize an image for Instagram without cropping out the sides?
QCan I resize multiple photos of different sizes at the same time?
QAre my photos uploaded to any external server during resizing?
QWhat image formats can I resize?
QIs 7xm Image Resizer completely free to use?
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