Resize Image Online Free — Exact Dimensions, Percentage & Social Presets
Resize any image instantly with ShiftPx's free online image resizer. Change dimensions by percentage, enter exact pixel sizes (like 1080×1080 for Instagram), or use built-in social media presets for YouTube thumbnails, Facebook covers, and LinkedIn headers. Batch resize multiple photos at once with 100% privacy — runs entirely in your browser.
Image Resizer FAQ
How do I resize an image for Instagram?
Select the "Presets" tab in the resize settings and click "Instagram Post" (1080×1080) or "Instagram Story" (1080×1920). Upload your image, and ShiftPx will resize it instantly to the correct dimensions with zero quality loss.
Can I resize images without losing quality?
Yes. ShiftPx uses high-quality bicubic resampling algorithms. For best results, set the quality slider to 90%+ when saving as JPEG or WebP. PNG format is lossless and preserves full quality regardless of resize.
Is there a file size limit for resizing?
No server limit. Since all processing runs locally in your browser, the only limit is your device's memory. Most phones and laptops handle images up to 50MB+ easily.
Official 2026 Social Media Image Dimension Reference
| Platform | Image Type | Size (px) | Aspect Ratio |
|---|---|---|---|
| Instagram Post | Square | 1080 × 1080 | 1:1 |
| Instagram Portrait | Vertical Feed | 1080 × 1350 | 4:5 |
| Instagram Story / Reel | Full Screen | 1080 × 1920 | 9:16 |
| YouTube Thumbnail | Standard HD | 1280 × 720 | 16:9 |
| YouTube Channel Banner | Header | 2560 × 1440 | 16:9 |
| Facebook Feed Post | Landscape | 1200 × 630 | 1.91:1 |
| LinkedIn Banner | Company Cover | 1128 × 191 | ~6:1 |
| Twitter / X Header | Banner | 1500 × 500 | 3:1 |
Related Tools
- ✂️ Crop Image Online — Crop to exact size or aspect ratio for social media and passport photos
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