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← Sydium
Free Tool

Social Media Image Resizer

Resize images for every platform instantly. 14 presets across 7 platforms, no signup required.

Drop your image here or click to upload

JPEG, PNG, or WebP — max 10MB

Image Optimization Tips

Start with High Quality

Upload the highest resolution image you have. Resizing down preserves quality, but resizing up creates blur.

Match Aspect Ratios

Using the correct aspect ratio for each platform prevents awkward cropping and ensures your content looks professional.

Stay Consistent

Use the same dimensions across posts to maintain a cohesive feed aesthetic.

Platform Requirements

Each platform has recommended sizes. Using the correct dimensions improves how your content is displayed in feeds.

Want to resize and schedule in one place?

Sydium automatically resizes images for each platform when you publish.

Try Sydium Free

Frequently Asked Questions

What image size should I use for Instagram posts?

Instagram supports square (1080x1080), portrait (1080x1350), and landscape (1080x566). Portrait format (1080x1350) takes up the most screen real estate and typically gets the most engagement.

What is the ideal YouTube thumbnail size?

YouTube thumbnails should be 1280x720 pixels (16:9 aspect ratio). This is the standard size that YouTube recommends and works best across all devices.

Does resizing affect image quality?

Resizing down (making images smaller) preserves quality. Our tool uses high-quality center cropping to ensure the most important part of your image stays visible. JPEG output uses 90% quality for optimal file size.

What format should I use: JPEG or PNG?

Use JPEG for photos (smaller file size, good quality). Use PNG for graphics, logos, or images with text (lossless quality, supports transparency). Most social media posts work best as JPEG.

Is this tool really free?

Yes, completely free. Your images are processed entirely in your browser — nothing is uploaded to our servers. No signup, no watermarks, no limits.

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