On this page
- Quick answer
- Tool facts
- What changes when you resize an image?
- How to resize an image online
- Resize by pixels or percentage
- Choose the right fit method
- Why exact width and height can crop a photo
- Ready-made sizes and upload requirements
- Avoid enlarging a small source unnecessarily
- File format, quality and privacy
- Frequently asked questions
Quick answer
Resize JPG, PNG and WebP images by pixels or percentage. Keep proportions, crop to fill or add padding, preview dimensions and download with Toolinet.
Tool facts
- Input formats
- JPG, PNG, WebP
- Output formats
- JPG, PNG, WebP
- Input limits
- 20 × 30 MB; ≤16 MP; ≤8192 × 8192 px
- Processing
- In your browser
- Price
- Free
Set the image dimensions you need before uploading or sharing. Toolinet’s free image resizer changes JPG, PNG and WebP images by pixels or percentage. Keep the original proportions, fill an exact frame or add padding when every part of the photo must stay visible. Review the planned result before creating the download.
What changes when you resize an image?
Image dimensions describe the width and height in pixels. File size describes how much storage the image uses, usually in KB or MB. Changing dimensions often changes file size too, but the two measurements are not interchangeable. A 1000-pixel-wide image does not automatically meet a 100 KB upload limit.
This resizer accepts up to 20 images, with a maximum of 30 MB per file. It offers pixel and percentage modes, ready-made sizes, different fit methods and JPG, PNG or WebP output. Processing runs in your browser.
How to resize an image online
- Choose images. Add supported files or use Try a sample to explore the controls.
- Select a sizing method. Enter pixel dimensions or choose Percentage for proportional scaling.
- Choose how the image fits. Decide whether to keep proportions, crop to fill, add padding or stretch.
- Check the planned dimensions. Review the preview, especially when source and target shapes differ.
- Select an output format. Keep the source format or use another supported option accepted by your destination.
- Resize and download. Run Resize images, inspect the completed output and save individual files or a ZIP.
Resize by pixels or percentage
Pixel mode is useful when a form or design gives a specific width or height. In Fit within mode, you can enter one dimension and leave the other as Auto. The image keeps its proportions within the maximum dimensions you set.
Percentage mode is useful when you simply need a proportional reduction. Scaling a 1600 × 1000 image to 50% gives 800 × 500 pixels. That output was verified with the built-in sample during Toolinet site testing on 25 October 2026. The same arithmetic applies to both axes when proportions are retained.
Choose the right fit method
| Method | What happens | Best use |
|---|---|---|
| Fit within | Preserves proportions within your maximum width and height | Keeping the entire image without padding |
| Crop to fill | Fills the exact dimensions and removes excess edges | Banners and frames that must be filled |
| Add padding | Preserves the subject and fills remaining canvas space | Exact-size product or document images |
| Stretch | Forces the image into the target dimensions | Cases where distortion is acceptable |
If faces look wider or products look thinner, check whether Stretch is selected. Use Fit within or padding when preserving shape is more important than filling the frame.
Why exact width and height can crop a photo
Suppose you have a 1600 × 1000 landscape image and need a 1080 × 1080 square. Those shapes have different aspect ratios. Fit within preserves the whole image but does not fill the square. Crop to fill fills it by removing part of the sides. Padding keeps the whole image and adds space around it.
If the subject needs careful placement, first use the Image Cropper to control the frame. Then resize the chosen crop to the destination’s dimensions.
Ready-made sizes and upload requirements
The presets include square, portrait, vertical-story, landscape, product-square and thumbnail dimensions. Treat them as convenient canvas sizes rather than a promise that every website currently requires them. Check the destination’s own upload instructions for dimensions, file type and maximum bytes.
For passport and ID layouts, the Passport Photo Maker offers dedicated crop and print controls. An ordinary social-image preset is not a substitute for an identity-photo specification.
Avoid enlarging a small source unnecessarily
The Do not enlarge image content option helps prevent small originals from being scaled up. Padding can still add canvas space. Enlarging an image cannot recover detail that the original never captured; it may look soft even if the new file has more pixels.
Start from the largest clean original you have and make a separate resized copy. Check edges and text at the intended display size instead of judging only by a zoomed-out preview.
File format, quality and privacy
Use JPG for ordinary photos without transparency. PNG is useful for transparent graphics and sharp artwork; WebP can also preserve transparency. Confirm which formats the receiving service accepts. To reduce bytes after resizing, try the Image Compressor.
Selected files are resized on your device. Resized downloads remove EXIF metadata, while your originals stay unchanged. Normal website requests still reach the host, as explained in the privacy information. If a large batch fails, try fewer images, smaller dimensions or a current browser with more available memory.
Frequently asked questions
How do I resize an image without stretching it?
Use Fit within to preserve proportions, or Add padding when you need an exact canvas size. Avoid Stretch unless changing the original shape is acceptable.
Why is my image smaller than the width and height I entered?
In Fit within mode, width and height are maximums. The output keeps its aspect ratio, so one side may be smaller than the maximum. The no-enlarge option can also prevent upscaling.
Can I resize an image to an exact square?
Yes. Use Crop to fill for a filled square or Add padding to keep the entire source inside an exact square canvas. Review whether important edges are removed.
Does resizing reduce file size in KB?
Reducing pixel dimensions often reduces bytes, but format, image detail and quality also matter. Check the downloaded file size and use the Image Compressor if needed.
Will enlarging an image make it sharper?
No. Increasing dimensions adds pixels but cannot recover original detail that is missing. A higher-resolution source usually gives a better result.
Can I resize several images in a batch?
Yes. The resizer accepts up to 20 supported images, with a maximum of 30 MB each. You can download completed outputs individually or together as a ZIP.