What this guide covers
Resize an image to exact pixel dimensions or scale it by percentage. Keep the aspect ratio, preview the result, and export PNG, JPG, or WebP in your browser. Locking the aspect ratio prevents distortion, but enlarging a raster image cannot restore detail that is not in the source. For the sharpest result, start with the largest original and resize down when possible. Upload the image, keep Pixels selected, enter the target width or height, and leave the aspect-ratio lock on if you do not want stretching. Then select Resize Image. Yes. Choose Percentage and set a value from 1% to 200%, or use the 25%, 50%, 75%, and 100% shortcuts.
Resize an image to exact pixel dimensions or scale it by percentage. Keep the aspect ratio, preview the result, and export PNG, JPG, or WebP in your browser.
Image Resizer changes pixel dimensions—the width and height of a photo or graphic. Enter exact pixels or scale the whole image by percentage, keep its proportions when needed, preview the result, and download a new PNG, JPG, or WebP file.
Use Pixels when a website, profile, email, or design requires an exact width or height. Use Percentage for proportional scaling such as 50%. The aspect-ratio lock updates the other dimension automatically; unlocking it can stretch the image. Resizing does not crop content from the edges.
PNG supports transparency, while JPG replaces transparent areas with white. JPG and WebP quality changes encoder quality and may affect file size, but this tool does not target a file size in KB or MB. Resizing and compression are related but different tasks.
Before you start
- Keep the original file and work from a copy.
- Decide the required order, layout, and output format before processing.
- Test with a small sample and check the preview before exporting everything.
Recommended workflow
- 1
Upload an image
Choose one JPG, PNG, WebP, GIF, or BMP file. Animated GIF input uses its first frame.
- 2
Set the new dimensions
Enter a width and height in pixels or choose a percentage, then keep or unlock the original aspect ratio.
- 3
Resize and download
Choose PNG, JPG, WebP, or the supported source format, adjust quality when available, preview, and download.
- 4
Review the complete output
Open the downloaded result and check order, cropping, readability, orientation, and file size.
Choose the right path
| Situation | Use | Why |
|---|---|---|
| Website and email images | Image Resizer | Reduce large camera images to practical pixel dimensions for pages, newsletters, and attachments. |
| Profile and form uploads | Image Resizer | Set an exact width or height while keeping the original proportions for avatars and online forms. |
| Thumbnails and previews | Image Resizer | Create smaller PNG, JPG, or WebP copies for content previews and design handoff. |
Common mistakes
- Starting without deciding the final order or layout.
- Trusting the preview without opening the downloaded file.
- Using maximum compression or cropping before checking important details.
Final checklist
- The original file is unchanged.
- Order and orientation are correct.
- Text and important details remain readable.
- The output opens in another viewer.
- The file format and size fit the sharing channel.
FAQ
How do I resize an image to exact pixels?
Upload the image, keep Pixels selected, enter the target width or height, and leave the aspect-ratio lock on if you do not want stretching. Then select Resize Image.
Can I resize an image by percentage?
Yes. Choose Percentage and set a value from 1% to 200%, or use the 25%, 50%, 75%, and 100% shortcuts.
What does lock aspect ratio do?
It preserves the original width-to-height relationship. Changing one dimension automatically calculates the other, which prevents accidental stretching.
Is resizing the same as cropping or compression?
No. Resizing changes pixel dimensions, cropping removes edge content, and compression mainly reduces encoded file size. This tool resizes and can adjust JPG or WebP quality, but it does not crop or target an exact KB value.