Start with the required dimensions
Check the destination first: an upload form may require exact width and height, while a website may only need a maximum width. Use pixel dimensions supplied by that destination instead of guessing. Scaling changes the pixel grid; it does not add detail to a small original.
Choose how the image fits the target frame
Open the Image Resizer and select one static JPG, PNG, or WebP image. Preserve proportions is the default: entering one dimension updates the other. Choose Crop to fill when the required width and height have a different shape; it removes edges without stretching. Choose Stretch to fit only when distortion is acceptable.
Example: turn a landscape photo into a square
Suppose the source is 1600 × 900 pixels and the destination needs 1080 × 1080 pixels. Select Crop to fill and enter 1080 for both dimensions. The tool first selects a 900 × 900 square from the original. At centered focus, it starts 350 pixels from the left edge, then scales that square to 1080 × 1080. Move horizontal focus toward the left or right if the subject is off-center. The output has the exact requested dimensions, but the removed edges cannot be recovered from the exported copy.
Choose an output format
Keep the source format for a straightforward resize. PNG is useful when transparent pixels matter; JPEG is widely accepted for photographs but transparency is filled white. WebP can make compact web assets, but first check whether the destination accepts it.
Preview and verify the exported file
Generate the copy and check the reported pixel dimensions and preview. Download it, then inspect the file properties or reopen it in the destination. When cropping, check that faces, text, or other important details remain visible. Image resampling can soften fine detail, especially after a large reduction; view it at its intended display size.
Understand what browser resizing changes
The conversion happens in the current browser tab, not on a JuzhenWork processing server. A browser canvas may alter color-profile or metadata details. Cropping removes pixels outside the selected frame; upscaling does not create detail. The tool does not process animations or guarantee that a destination will accept the file.