Image Resizer
Change the size of any JPG, PNG, or WEBP image in seconds, right in your browser.
Drag & drop your image here
or click to browse files
JPG, PNG, WEBP · Max 20MB
Aspect ratio locked
PNG is lossless; quality setting is ignored.
Image resized successfully!
What does this Image Resizer do?
This tool changes the pixel size of a JPG, PNG, or WEBP image and saves the result as a new file. You can set an exact width and height, or scale the picture up or down by a percentage. Before you resize, the tool shows a preview of your image, its original size and dimensions, and the output dimensions and estimated file size for your current settings. The image is processed inside your browser, so it is never uploaded to a server.
How to Use This Image Resizer?
- Upload your image. Drag and drop a JPG, PNG, or WEBP file onto the drop zone, or click it to browse. Files up to 20MB are accepted.
- Check the preview and image info. The tool shows the file name, original file size, and original dimensions. Use the Change button if you picked the wrong file.
- Choose a size. Pick a quick preset, type your own width and height, or switch to Percentage and move the scale slider.
- Set format and quality. Choose JPG, PNG, or WEBP as the output format and adjust the quality slider for JPG and WEBP.
- Click Resize Image. A progress bar runs briefly, then a result panel shows a small preview, the new dimensions, and the new file size.
- Download or start over. Click Download to save the resized file, or press Reset to clear everything and begin with another image.
Built-In Features
Drag and Drop Upload
Drop a JPG, PNG, or WEBP file straight onto the upload area. Unsupported formats and files over 20MB are automatically rejected with a clear, helpful message.
Quick Size Presets
One click fills in the width and height for an Instagram post, YouTube thumbnail, Facebook cover, or Twitter post. Custom Size lets you enter your own numbers.
Dimensions or Percentage
Resize to exact pixel values, or use the scale slider from 1% to 200% with quick buttons for 25%, 50%, 75%, 100%, 150%, and 200%.
Aspect Ratio Lock
With the lock on, changing the width updates the height automatically, and the other way around. Turn it off when you need to set both values freely.
Format and Quality Control
Save the result as JPG, PNG, or WEBP. The quality slider runs from 10% to 100% and applies to JPG and WEBP, while PNG stays lossless.
Live Estimate and Instant Download
Output dimensions and an estimated file size update as you change settings. After resizing, the real file size is shown next to the Download button.
How Image Resizing Works
Resizing means redrawing your picture on a canvas of a new width and height. The tool offers two ways to decide that new size, and both end with the same high quality smoothing step when the image is redrawn.
Width and Height Mode
You type a width, a height, or pick a preset. While the aspect ratio lock is on, the other side is calculated from your original proportions and rounded to a whole pixel. Each side can be up to 8000 pixels.
Percentage Mode
Both the width and the height of the original image are multiplied by the scale you choose, so the proportions never change. It is the quickest option when you just want a picture smaller or larger without picking exact numbers, while keeping the original aspect ratio perfectly intact.
Whichever mode you use, the dimensions you see under Output Dims are the exact size of the file you will download.
Can You Resize an Image Without Losing Quality?
Mostly yes, as long as you make the image smaller. When you shrink a picture, the tool has more pixels than it needs, so the result still looks sharp at its new size. Making an image larger is different. Every pixel has to be stretched, and no resizer can invent detail that was never in the original. That is why the scale slider tops out at 200% and why enlarged images can look soft.
| What You Do | What Happens to Quality |
|---|---|
| Make the image smaller | Stays sharp, since the tool has more detail than it needs |
| Keep the same size, save as PNG | Lossless, the quality slider is ignored |
| Save as JPG or WEBP at 90% or higher | Very little visible loss for most photos |
| Make the image larger | Can look soft, because no new detail is added |
The quality slider starts at 92%, a good balance for photos. Lower it only when a smaller file matters more than perfect detail.
How to Make an Image Smaller in File Size
Many people search for a way to reduce an image in KB or MB. Three things control file size here: how many pixels the image has, which format you save it in, and the quality setting. Reducing the dimensions usually has the biggest effect, because fewer pixels means less data to store. This tool does not aim for an exact KB target, but the Est. Output value in the Image Info panel gives you a rough idea before you resize, and the success panel shows the real size afterwards.
| Setting | Effect on File Size |
|---|---|
| Smaller width and height | Biggest reduction, especially on large camera photos |
| Lower quality slider | Smaller file for JPG and WEBP, at the cost of some detail |
| WEBP or JPG instead of PNG | Usually much lighter for photos |
| PNG output | Lossless, so files are often larger than JPG or WEBP |
If the result is still too heavy, try a lower percentage first, then lower the quality a few points at a time until you are happy with the balance.
What Size Should an Image Be for Social Media and the Web?
The four presets in this tool cover common social media sizes. These are general reference points, and platforms can change their recommendations, so check the platform if exact dimensions matter to you.
| Use Case | Size in Pixels |
|---|---|
| Instagram Post preset | 1080 x 1080 |
| YouTube Thumb preset | 1280 x 720 |
| FB Cover preset | 820 x 312 |
| Twitter Post preset | 1200 x 675 |
| Blog post or article image | 800 to 1,200 px wide |
| Website thumbnail | 150 to 400 px wide |
Presets resize your image to the exact size shown, without cropping. If your photo has a different shape than the preset, it will be stretched to fit. For a natural result, first trim the picture to the right shape with the Image Cropper, then apply the preset here.
Which Output Format Should You Choose?
The format you save in affects file size and how the image behaves. Your uploaded format does not have to match the output, so you can resize and switch formats in one step. If you only want to change a PNG into a JPG at its current size, the PNG to JPG Converter is a more direct option.
| Format | Quality Slider | Best Suited For |
|---|---|---|
| JPG | Applies | Photos and general sharing, widely supported |
| PNG | Ignored, lossless | Logos, screenshots, and images with sharp edges |
| WEBP | Applies | Websites where small file size matters |
Common Reasons to Resize an Image
Preparing Social Media Posts
Bring a photo to the exact dimensions a post, thumbnail, or cover expects, so it uploads cleanly every time without cropping issues.
Speeding Up a Website
Oversized photos slow pages down. Scaling them to the width they are actually displayed at makes pages lighter.
Meeting Upload Limits
Forms, portals, and email attachments often reject large files. A smaller image with a slightly lower quality setting often gets under the limit.
Making Small Previews
Create a quick 25% or 50% copy of a large image for sharing or reviewing, while keeping the original untouched.
Useful Tips
Keep the Lock On for Photos
Leave the aspect ratio lock on unless you truly need a different shape. Selecting a preset turns the lock off, so you can turn it back on if you want to fine tune one side.
Check Output Dims First
Glance at Output Dims and Est. Output in the Image Info panel before you click Resize Image. It saves you from repeating the process and wasting extra time later.
Your Original Stays Safe
Your source file is never changed. The download is a new file named after the original with the new size added, such as photo-800×600.jpg, ready for easy use.
Scale Up in Small Steps
If you must enlarge a picture, stay near the lower end of the scale range. Modest increases such as 125% or 150% hold up better than doubling the size.
Frequently Asked Questions
How do I resize an image online?
Upload your JPG, PNG, or WEBP image, enter a width and height or choose a percentage, then click Resize Image. When the result panel appears, click Download to save the new file.
Is this image resizer free?
Yes. The tool is free to use and does not require an account or sign-up.
Which image formats can I upload?
You can upload JPG, PNG, and WEBP images. Other formats are rejected with an error message.
What are the size limits?
The uploaded file can be up to 20MB, and the output width and height can each be up to 8000 pixels.
How do I resize an image to an exact size in pixels?
Stay in Dimensions mode and type the width and height you need. Turn off the aspect ratio lock if you want to set both values independently. The Output Dims field shows the final size before you resize.
How do I resize an image by percentage?
Switch to Percentage under Resize By, then move the slider or tap a quick button such as 50%. Both sides are scaled together, so the proportions stay the same.
Can I resize an image without losing quality?
Making an image smaller keeps it looking sharp. Making it larger cannot add detail that was not in the original, so enlarged images can look soft. Saving as PNG is lossless, while JPG and WEBP depend on the quality slider.
Will resizing reduce the file size in KB or MB?
Usually yes, especially when you reduce the dimensions. Lowering the quality slider for JPG or WEBP shrinks it further. The tool shows an estimated size before you resize and the actual size afterwards, but it does not let you set an exact KB target.
What does the aspect ratio lock do?
When the lock is on, changing the width automatically updates the height, and changing the height updates the width, so the picture keeps its original proportions. When it is off, you can enter any combination of values.
Do the presets crop my image?
No. A preset sets the exact width and height and resizes the whole image to that size. If your picture has a different shape, it will be stretched or squeezed to fit.
Can I change the format while resizing?
Yes. Choose JPG, PNG, or WEBP under Output Format, and the resized file will be saved in that format regardless of what you uploaded.
Is my image uploaded to a server?
No. The image is read and resized entirely in your browser. It is never uploaded or stored anywhere.
What will the downloaded file be called?
The name is based on your original file name with the new dimensions and format added, for example vacation-1200×800.webp.
Does this tool work on mobile devices?
Yes. The tool is responsive and works on phones, tablets, and desktop browsers.