Free Online Image Resizer
Change image dimensions in pixels instantly. Lock aspect ratio, choose output format, and download in seconds — no sign-up required.
Or drop an image here · Max 20 MB
Why Use Our Image Resizer?
Lock Aspect Ratio
Automatically keep proportions to avoid distorted, stretched images.
Exact Pixel Control
Set any width and height in pixels. Common presets for social media included.
Browser-Based
Resizing runs entirely in your browser — fast, private, no server upload.
3 Output Formats
Download as JPEG, PNG, or WebP with adjustable quality.
Social Media Image Size Guide
| Platform | Use | Recommended Size |
|---|---|---|
| Post (square) | 1080 × 1080 px | |
| Story / Reel | 1080 × 1920 px | |
| Twitter / X | Post image | 1200 × 675 px |
| Shared image | 1200 × 630 px | |
| Post image | 1200 × 627 px | |
| YouTube | Thumbnail | 1280 × 720 px |
| Open Graph | Website preview | 1200 × 630 px |
Frequently Asked Questions
How do I resize an image without losing quality?▾
Our tool uses high-quality interpolation automatically. Scaling down keeps quality; scaling up slightly reduces sharpness — start with the highest resolution source image you have.
What does locking the aspect ratio do?▾
When aspect ratio is locked, adjusting width automatically updates the height (and vice versa) to keep proportions unchanged, preventing distortion.
Which format should I use?▾
JPEG for photos and social sharing (small size). PNG for logos and transparent images (lossless). WebP for web use where you want the smallest file.
Is there a maximum size?▾
Upload up to 20 MB. Output can be set up to 8000 × 8000 pixels.
Is my image uploaded to the server?▾
No. Resizing happens entirely in your browser. Your image never leaves your device — 100% private.
More Free Image Tools
All the tools you need for your images, 100% free