Image Resize
Change the size of images
Features
Linked conversion of width, height, and %
When keeping the aspect ratio, one input automatically updates the rest
Comparison overlaid on the original size
Check the resized dimensions overlaid on the original image's frame
Output that considers the original image format
JPEG stays JPEG, and others are saved as PNG
Save inheriting the original file name
Automatically append -resized to the download name
How to use
Select the image to resize
Choose the target from the image file field, and the original width and height are automatically filled in the input fields
Specify the new size
Enter a value in width, height, or percentage. You can also toggle "Keep aspect ratio" on or off
Fine-tune on the preview
Drag the handles shown at the four corners of the resized image to adjust the size intuitively
Save the resized image
Press the download button to save the image file at the specified size
Use cases
Creating SNS icons
Shrink a profile image to match the recommended size of each service
Lightening blog images
Shrink large photos to fit the display width and speed up page loading
Unifying images for documents
Align the size of screenshots placed in presentations and proposals to improve the look
Adjusting photos for applications and registration
Change the size to match the pixel limits of ID photos and application forms
Basic Knowledge
What is a Pixel
A pixel is the smallest colored dot that makes up a digital image. Image size is expressed as the number of pixels in width × height. The more pixels an image has, the more detailed it is, but the larger its file size becomes.
Why Image Quality Degrades When Enlarged
Enlarging an image involves filling in missing pixels by inferring colors from surrounding areas. Since information that wasn't originally present cannot be created, blurring and jagged edges occur. Reduction simply removes information, so degradation is less noticeable. For this reason, resizing is best used in the reduction direction.
Safety and Privacy
Runs entirely in your browser
Your input data is processed only within your browser and is never sent externally.
Processing only in your browser
loading and resizing images is processed entirely within your browser, and input data is not sent to any server.
Communications encrypted with HTTPS
Page loading is also encrypted by TLS, and content cannot be read by third parties.
No transmission to third parties
Input content is not sent to external services such as ad networks or trackers.
No automatic saving of results
the resized images and input suggestions are not stored on the server.
Follow RAKKOTOOLS on Google Search
211 useful tools become easier to find from Google Search and AI Search!
- Found in search
- Also shown in AI Search
- Discover new tools
Updates
- update #379
Fixed issue where image resizer preview appeared wider or taller than specified
- update #300
Fixed issue where resized images fail to save on iPhone
- update #290
Batch resize multiple images and save as ZIP
- update #274
Specify the save filename when downloading resized images
- update #187
Fixed issue where image height shifted and no result appeared when maintaining aspect ratio during image resize
Featured Tools
RAKKOTOOLS is free to use!
Available free of charge for individuals and corporations, commercial and non-commercial use alike.No prior permission or usage application is required. Feel free to use it in various situations.
Use in streaming and videos
Use various tools such as lottery draws and raffles in live streams and videos.
Use in schools, work, and events
Can be used in various situations such as classes, team division, internal work, and events.
Introduction on Web, books, and SNS
Feel free to introduce it as a useful tool on web media, books, SNS, and other platforms.
Commercial use
Can be used for commercial purposes such as research, calculation, processing, and conversion in business and production.
If you mention it, I get motivated to create more tools!
If using in streaming and videos
Link to RAKKOTOOLS in the description, or Mention or display that you are using RAKKOTOOLS in the stream or video.
Credit example for the description
Usage guidelinesYou are free to use it for normal purposes. However, use for purposes that violate laws, infringe on third-party rights, impose significant load on the service, or otherwise interfere with service operation is prohibited.
We do not guarantee the accuracy or completeness of information and calculation results obtained from each tool.
This notice is a translation of the original Japanese text. If there is any discrepancy between the translation and the original, the Japanese original takes precedence.