How to use the image resizer
- Drop an image onto the upload area or choose a file (JPG, PNG, WebP, GIF or BMP up to 25 MB).
- Set the new width and height, or use a quick scale button. Keep the aspect ratio locked to avoid stretching.
- Pick an output format and quality.
- Press Resize & compress, compare sizes, then Download.
Smaller images, faster everything
Large images slow down websites, bounce off email attachment limits and get rejected by upload forms. This resizer lets you change dimensions, compress and convert formats in one step, entirely on your device.
How it works
Your image is decoded by the browser and drawn onto an HTML canvas at the new size. For big reductions, it is scaled down in halving steps, which keeps edges noticeably sharper than a single jump. The canvas is then encoded to JPG, WebP or PNG at your chosen quality. Because the whole process happens locally, it’s fast and private.
Recommended sizes
| Use | Size (px) | Format |
|---|---|---|
| Website hero / full-width | 1920 × 1080 | WebP or JPG, 75–80% |
| Blog content image | 1200 × 800 | WebP, 75–80% |
| Open Graph / social share | 1200 × 630 | JPG, 85% |
| Instagram square | 1080 × 1080 | JPG, 85% |
| YouTube thumbnail | 1280 × 720 | JPG, 85–90% |
| Profile photo | 400 × 400 | JPG, 85% |
| Email attachment | longest side 1600 | JPG, 75% |
Resize vs. compress
- Resizing reduces the number of pixels. Halving width and height cuts pixel count by 75%, the biggest single saving.
- Compressing reduces how many bytes each pixel takes, by trading invisible detail for size.
For the smallest files, do both: resize to the size you’ll actually display, then compress at 75–85%.
Aspect ratio
With Lock aspect ratio on, changing the width recalculates the height automatically, so nothing gets stretched. Turn it off only when you deliberately need exact dimensions, and expect distortion if the ratio changes.
Related tools
Grabbing a video’s thumbnail to resize? Use the YouTube thumbnail downloader first, then bring the image back here.
Frequently asked questions
Are my images uploaded to a server?
No. Resizing and compression use your browser's canvas engine on your own device. The image never leaves your computer or phone.
Which format should I choose?
Use JPG for photos, WebP for the smallest files on the web (supported by all modern browsers), and PNG for screenshots, logos and images that need transparency or sharp edges.
What quality setting should I use?
75–85% is the sweet spot for photos — files are often 60–80% smaller with no visible difference. Go lower only for thumbnails. PNG is lossless, so the quality slider does not apply.
Why did my PNG get bigger?
PNG is lossless, so photos saved as PNG are usually large. Convert photos to JPG or WebP for much smaller files.
Does resizing remove EXIF metadata?
Yes. Images drawn to a canvas are re-encoded without EXIF data such as GPS location and camera details, which is good for privacy.