Question 1

How does image resizing work?

Accepted Answer

Our tool uses the Pica library with the Lanczos filtering algorithm for high-quality image resizing. Unlike basic browser resizing, Lanczos filtering preserves sharp edges and fine details, making it ideal for professional work. The entire process happens in your browser - no uploads required.

Question 2

What is aspect ratio locking?

Accepted Answer

When aspect ratio is locked, changing the width automatically adjusts the height (and vice versa) to maintain the original image proportions. This prevents distortion and keeps your image looking natural. You can unlock aspect ratio to set any custom dimensions, which is useful when you need to fit specific size requirements or crop to a different shape.

Question 3

What are the social media presets for?

Accepted Answer

Our social media presets provide one-click resizing to the optimal dimensions for each platform: Instagram Posts (1080×1080), Instagram Stories (1080×1920), Facebook Posts (1200×630), Twitter Posts (1600×900), LinkedIn Posts (1200×627), and YouTube Thumbnails (1280×720). These presets ensure your images display perfectly on each platform without cropping or distortion.

Question 4

Can I use custom dimensions?

Accepted Answer

Yes! You can enter any custom width and height between 1 and 10,000 pixels. This is useful when you need specific dimensions for websites, print materials, or other requirements. You can also lock or unlock the aspect ratio depending on whether you want to maintain the original proportions or stretch/crop to exact dimensions.

Question 5

Does resizing reduce file size?

Accepted Answer

Generally, yes. Making an image smaller (reducing dimensions) will reduce the file size since there are fewer pixels to store. However, if you're enlarging an image (upscaling), the file size may increase. For maximum file size reduction, consider using our Compress Image tool after resizing to optimize both dimensions and compression.

Question 6

Will resizing affect image quality?

Accepted Answer

When downsizing (making images smaller), quality loss is minimal thanks to our Lanczos filtering algorithm, which is specifically designed to preserve detail. When upscaling (making images larger), you may see some softness or pixelation since we're creating pixels that didn't exist in the original. For best quality, always start with the highest resolution image available and downsize from there.

Question 7

What's the maximum image size I can resize?

Accepted Answer

You can resize images with dimensions up to 10,000×10,000 pixels. The original file can be up to 50MB. For files larger than 10MB, you may see a warning as processing time increases. Very large images may take longer to process depending on your device's capabilities.

Question 8

Does resizing change the image format?

Accepted Answer

No, resizing preserves the original format. If you upload a PNG, you'll get a PNG. If you upload a JPG, you'll get a JPG. The format remains the same to maintain compatibility. If you need to convert between formats, use our Format Converter tool instead.

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