Lossless Image Scaling

Online lossless scaling of image dimensions and proportions, supporting custom width, height, or scaling ratio, maintaining clarity.

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Image Lossless Scale Enlarge

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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

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.
Select Scaling Type: According to your needs, select "Size Scaling" or "Ratio Scaling" from the "Scaling Type" dropdown menu.
Configure Scaling Parameters:
- Size Scaling: If you select "Size Scaling", you can enter the target "Width (px)" or "Height (px)". It is recommended to check "Maintain 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 select "Ratio Scaling", please enter your desired scaling factor in the "Scaling Ratio (0-2)" field (for example, enter 1.5 to enlarge 1.5 times, enter 0.5 to reduce by half).
Start Conversion: After configuration, click the blue "Convert" button.
Get Results: After processing is complete, you will see the download link for the processed image in the results 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 size of 5MB per image.
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 be consistent with your uploaded original image.
Q: Does lossless scaling truly not lose image quality?
A: For bitmap images (such as PNG, JPG), "lossless" primarily refers to the tool using advanced interpolation algorithms when adjusting dimensions to maintain the integrity of pixel information as much as possible, avoiding the introduction of new compression artifacts, 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 results.
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.

Important Notes

File Format Requirements: Please ensure that you upload PNG or JPG format image files; other formats will not be recognized.
File Size Limit: A single image file size must not exceed 5MB; exceeding this limit may result in upload failure or processing errors.
Size Scaling (Maintain Aspect Ratio): When you select "Size Scaling", if both width and height are set but "Maintain Aspect Ratio" is not checked, the image may appear stretched or compressed. To ensure correct image proportions, it is recommended to always check "Maintain Aspect Ratio" or only enter either the width or the 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.