How this free Image Resizer works
This Image Resizer runs entirely in your browser. When you upload an image or load one from a public URL, the file is decoded
locally and rendered on a canvas element. When you change width, height, or output format, the tool redraws the image at the new
dimensions and exports it as a downloadable file.
Because processing happens on your device, your image is not sent to a server for resizing. This makes the tool fast, privacy-friendly,
and convenient for everyday tasks like preparing social media visuals, website images, thumbnails, and presentations.
Common reasons to resize images
- Prepare post and story images for Instagram, Facebook, TikTok, Snapchat, and WhatsApp.
- Create a YouTube thumbnail that matches recommended pixel dimensions.
- Reduce image dimensions for faster page load and better user experience.
- Export web-ready images in JPG/WebP or keep transparency with PNG.
Popular preset examples
| Platform |
Use case |
Pixels (W × H) |
| Instagram | Post (Square) | 1080 × 1080 |
| Instagram | Story / Reel Cover | 1080 × 1920 |
| Facebook | Page Cover | 820 × 360 |
| YouTube | Thumbnail | 1280 × 720 |
| TikTok | Vertical Video | 1080 × 1920 |
| LinkedIn | Profile Cover | 1584 × 396 |
| Pinterest | Pin | 1000 × 1500 |
| Web | Open Graph Share | 1200 × 630 |
Step-by-step: resize an image
1) Upload or load from URL
Click Upload to choose a file from your device or drag and drop an image into the upload area. If your image is already
hosted online, paste a direct image URL and click Load.
2) Choose a preset or custom size
Use the Preset sizes dropdown to quickly pick the correct dimensions for popular platforms and placements (post, cover,
thumbnail, banner, profile, story). You can also enter custom width and height. Keep aspect ratio enabled to prevent
distortion.
3) Select output format and quality
Choose JPG for photos, PNG for transparency and crisp graphics, or WebP for smaller files
with modern compression. Adjust the quality slider for JPG/WebP to balance file size and clarity.
4) Apply and download
Click Apply resize to update the preview, then click Download resized image. The result is saved locally to
your device.
Best practices for better results
- Resize to the real display size: Avoid uploading images larger than you need.
- Prefer WebP when supported: It often reduces file size significantly.
- Use PNG for logos: Especially when you need transparency.
- Test on mobile: Verify clarity and framing on small screens.