Set exact pixel dimensions, lock aspect ratio, and export as JPEG, PNG, or WebP. 100% browser-based — your images never leave your device.
How to Resize an Image Online — 3 Steps
- 1
Upload your image — Drag and drop or click "Choose Image". Supports JPEG, PNG, WebP, GIF, and BMP.
- 2
Set dimensions or pick a preset — Type a custom width and height, or tap any Quick Preset (Instagram, YouTube, etc.). Toggle "Lock aspect ratio" to prevent distortion.
- 3
Resize and download — Click "Resize Image →", preview the result, then download as JPEG, PNG, or WebP.
Social Media Image Sizes — 2026 Reference Guide
Updated June 2026. Instagram's January 2026 grid update shifted the recommended feed post from square 1:1 to portrait 4:5.
| Platform | Type | Dimensions (px) |
|---|
| Instagram | Feed Post (Portrait) ★ | 1080 × 1350 |
| Instagram | Square Post | 1080 × 1080 |
| Instagram | Story / Reel | 1080 × 1920 |
| Facebook | Feed Post | 1080 × 1350 |
| Facebook | Link Preview (OG) | 1200 × 630 |
| Facebook | Cover Photo | 851 × 315 |
| X (Twitter) | Post Image | 1280 × 720 |
| YouTube | Thumbnail | 1280 × 720 |
| LinkedIn | Post Image | 1200 × 627 |
| TikTok | Story / Vertical | 1080 × 1920 |
| Website | Hero / HD Banner | 1920 × 1080 |
★ Instagram recommended format since January 2026 grid update. Source: Hootsuite Social Media Image Sizes Guide, June 2026.
Why Resizing Images Matters for Web Performance
According to the HTTP Archive Web Almanac 2025, images account for approximately 37% of the median desktop page weight — the single largest asset category on the web. Oversized images directly hurt your Google Core Web Vitals score, specifically LCP (Largest Contentful Paint), which measures how fast your main content loads. A 1-second delay in page load time reduces conversions by 7%.
- ✓Smaller images improve LCP and boost your Google Search ranking
- ✓WebP images are 25–34% smaller than JPEG at equivalent visual quality (Google)
- ✓Replacing animated GIFs with WebP reduces file size by up to 64%
- ✓Only 42% of mobile sites pass all Core Web Vitals — image optimization is the fastest win
- ✓Correctly sized images for social platforms prevent cropping and quality loss
JPEG vs PNG vs WebP — Which Format Should You Choose?
Best for: Photos & gradients
Lossy compression — great file sizes for photography. No transparency support. Used by 57% of web pages. Choose JPEG for maximum compatibility.
Best for: Logos & transparency
Lossless — pixel-perfect at any quality setting. Supports transparency (alpha channel). Larger files than JPEG or WebP. Ideal for screenshots and icons.
Best for: Web & social media
25–34% smaller than JPEG, 26% smaller than lossless PNG. Supports transparency AND animation. Supported by all modern browsers. The best all-round choice for 2026.
🔒 100% Private — Your Images Never Leave Your Browser
All image processing runs entirely in your browser using the HTML5 Canvas API. Your images are never sent to any server, never stored, and never logged. This makes our tool safe for sensitive or confidential images — including passport photos, medical images, and personal documents.
Frequently Asked Questions
Can I resize an image without losing quality?▾
Yes — downsizing always preserves sharpness. Set the quality slider to 85–100% and choose PNG (lossless) or WebP for the cleanest output. Upscaling beyond the original resolution adds no new detail, so keep dimensions at or below the original for best results.
What is the best image format for the web in 2026?▾
WebP is the best choice for web images. According to Google's WebP Compression Study, WebP lossy images are 25–34% smaller than JPEG at equal visual quality. WebP lossless is 26% smaller than PNG. It's now supported by all modern browsers including Chrome, Firefox, Edge, and Safari.
How do I resize an image to a specific file size in KB?▾
Use the quality slider to control file size — lower quality means a smaller file. Export as WebP or JPEG (not PNG) for the smallest output. A 1200×630 JPEG at 75–80% quality is typically 80–150 KB. Switching to WebP at the same quality trims that by another ~30%.
Is my image data private? Does it get uploaded to a server?▾
Yes — completely private. All resizing happens in your browser using the HTML5 Canvas API. Your image is never sent to any server, stored, or logged. This makes it safe for confidential, personal, or sensitive images including passport photos and ID documents.
How do I resize an image for Instagram in 2026?▾
Instagram's January 2026 grid update made portrait 4:5 (1080×1350 px) the recommended feed format. Square posts (1080×1080) still display correctly. Stories and Reels use 9:16 (1080×1920). Use the Instagram Post or Instagram Story quick preset above to set the right dimensions in one click.
What is the difference between resizing and compressing an image?▾
Resizing changes the pixel dimensions (e.g., 4000×3000 → 1200×900). Compression reduces file size without changing dimensions by lowering quality or using a more efficient format like WebP. This tool does both: resize by pixels and compress via the quality slider and format selector.
Can I resize a PNG without losing transparency?▾
Yes — select PNG as the output format and the alpha channel (transparency) is preserved exactly. Exporting a transparent PNG as JPEG fills transparent areas with white. WebP also supports transparency at smaller file sizes than PNG, making it the best choice for transparent web graphics.
Does this tool work on mobile phones?▾
Yes — fully responsive and tested on iOS and Android. Upload a photo from your camera roll, tap any Quick Preset for your target platform, adjust quality, and download the resized file directly to your device. No app install required.
