Lossless Image Scaling

Tool Introduction

"Lossless Image Scaling" is a powerful online image processing tool designed to help users adjust image dimensions or scale proportionally without losing image quality. Whether you need to precisely adjust an image to a specific size or simply enlarge or reduce an image, this tool provides a quick and easy solution. It supports custom settings for image width and height, and allows you to choose whether to maintain the original aspect ratio to prevent image distortion. Additionally, you can achieve precise proportional enlargement or reduction by entering a scaling ratio.

How to Use

1. Upload Image: Click the "Upload Image" area, or drag and drop your PNG/JPG image file into the designated area. Please note that a single image cannot exceed 5MB.
2. Select Scaling Type: According to your needs, select "Size Scaling" or "Ratio Scaling" from the "Scaling Type" dropdown menu.
3. Configure Scaling Parameters:
   • Size Scaling: If you selected "Size Scaling", you can enter the target "Width (px)" or "Height (px)". It is recommended to check "Keep Aspect Ratio" to avoid image distortion; in this case, you only need to enter one of the width or height, and the other will be calculated automatically.
   • Ratio Scaling: If you selected "Ratio Scaling", please enter your desired scaling factor in the "Scaling Ratio (0-2)" field (for example, enter 1.5 to enlarge by 1.5 times, enter 0.5 to reduce by half).
4. Start Conversion: After configuration, click the blue "Convert" button.
5. Get Results: After processing, you will see the download link for the processed image in the result area. Click to save the image.

Frequently Asked Questions

• Q: Which image formats and file sizes are supported?
• A: This tool currently supports uploading PNG and JPG image formats, with a maximum single image size of 5MB.
• Q: What is the output format?
• A: The output result is a download link for the processed image, and the image format (PNG or JPG) will remain consistent with your uploaded original image.
• Q: Does lossless scaling really not lose image quality?
• A: For bitmap images (such as PNG, JPG), "lossless" primarily means that when adjusting the size, the tool uses advanced interpolation algorithms to try to maintain the integrity of pixel information, avoiding the introduction of new compression distortion, thereby maximizing the preservation of the original image's clarity and detail. It does not mean that there will be absolutely no distortion after infinite enlargement, but within a reasonable range, it can provide very high-quality scaling effects.
• Q: Can multiple images be processed in batches?
• A: Currently, this tool is designed for single-image processing and does not support batch uploading and processing.

Notes

• File Format Requirements: Please ensure that you upload PNG or JPG image files; other formats will not be recognized.
• File Size Limit: The size of a single image file should not exceed 5MB; exceeding this limit may result in upload failure or processing errors.
• Size Scaling (Keep Aspect Ratio): When you select "Size Scaling", if both width and height are set but "Keep Aspect Ratio" is not checked, the image may appear stretched or compressed and distorted. To ensure correct image proportions, it is recommended to always check "Keep Aspect Ratio" or only enter one of the width or height.
• Ratio Scaling Range: The valid input range for "Scaling Ratio" is 0 to 2. Setting a ratio outside this range may lead to unexpected results or processing failure.