Original
- File name
- Image dimensions
- File size
IMAGE TOOLS
Image Resizer●
The right size. Without the guesswork.
A new format. A better fit. A smaller file.
Drop static PNG, JPG or WebP images here, or choose files.
Select up to 20 files, 100 MiB combined. Each image: up to 20 MiB, 16 megapixels and 8,192 pixels per side. Static PNG, JPG and WebP only.Your image is processed in this tab, not uploaded or saved by Dotool. Refreshing or closing the tab clears it. My workspace saves only a link to the tool.
Choose an image to begin.
Your images
Common settings apply to every file. With Keep proportions in Pixels mode, the width is shared and each height follows its own image. Files are processed one at a time.
| Image | Original size | Result | Status | Actions |
|---|
ZIP includes ready files only, including clearly marked results that did not reach their target. It bundles the image files without recompressing them.
Target size and reduction need JPG or WebP. Select one of these formats to enable them.
Higher quality usually creates a larger JPG or WebP. PNG does not use this setting.
Lossless mode uses OxiPNG to optimise the original PNG when dimensions are unchanged. Pixel values and transparency are preserved. Changing Image size still resizes pixels. No colour quantisation is applied.
Used for JPG transparency and for added borders in Fit with background.
Your result
Settings changed. Generate a new preview to update the result.
- Image dimensions
- File size
Before & after
Drag the divider to compare the result with the original in the same view. Zoom focuses on the centre; download the file to inspect the full image.
Previews fit the available space. Open or download the result to inspect it at full size.
Continue with this result
Use the generated image as the input for another tool, without choosing a file again.
Canvas export re-encodes pixels. Original metadata is not preserved; colour appearance may vary. This is not a lossless metadata-preserving optimiser.
A better fit for the next step.
Keep proportions is on by default. Change either pixel dimension and the other follows. Turn it off for exact dimensions, then choose a centred crop, a background border or stretching. Percentage mode always keeps the source proportions. Enlarging cannot restore missing detail.
All tools →Common questions
What is the difference between Crop and Fit?
Crop to fill fills the requested dimensions by removing edges equally around the centre. Fit with background keeps the full image and adds a border in your selected colour. Stretch changes the proportions.
Can I resize in percentages?
Yes. Choose Percent and enter a value above 0, up to 1,000%. Output is rounded to whole pixels, with at least one pixel per side. Output limits still apply.
Will increasing the size sharpen a small image?
No. This is normal browser resampling, not AI upscaling. Enlarging changes the number of pixels but cannot recover missing detail.
Can I process several images at once?
Yes. Select up to 20 static PNG, JPG or WebP images, up to 100 MiB combined. Common settings apply to all files, but percentage reduction is calculated from each original size. Files are processed sequentially. Review or download each completed result, or download ready files in a ZIP. Unsupported or unreadable files are marked individually.