e-Toolbox日本語
Period CalculatorBase ConverterQR Code GeneratorUUID GeneratorPassword GeneratorHash GeneratorImage ResizerImage GrayscaleImage BinarizerExif ViewerJSON FormatterColor PickerImage Color PickerURL EncoderBase64 ConverterUnix TimestampFavicon Generator3D Model ViewerVRM ViewerFunction PlotterStatistics CalculatorLinear RegressionDistribution SimulatorCharacter CounterText Diff CheckerRegex TesterBMI CalculatorBSA CalculatorBMR Calculator

Image Resizer

Resize images and adjust format and quality

Supported formats: JPEG, PNG, WebP, GIF, BMP

How to Use
  1. Click "Select Image" to upload an image file
  2. Choose a preset size or enter custom dimensions
  3. Select output format and quality
  4. Click "Resize" to process
  5. Click "Download" to save

* All processing is done in your browser. Images are never sent to a server.

About this tool

The Image Resizer changes the dimensions of JPG, PNG, WebP, and GIF images entirely in the browser. Aspect-ratio locking and multiple output formats make it suitable for quick batches without uploading photos to a server.

Common use cases

  • Shrink profile photos and avatars to the size required by social networks or forums.
  • Prepare blog thumbnails, OGP images, or e-commerce listings at consistent dimensions.
  • Reduce file size before attaching photos to email or messaging apps.
  • Generate multiple sizes of the same asset for responsive web design.