Does resizing an image reduce quality?

Scaling an image down (downsampling) is generally lossless in terms of perceived quality when done with a good algorithm. Scaling an image up (upsampling) will soften detail because pixels are being interpolated. ZeroPNG uses the browser Canvas API with bicubic-equivalent smoothing for clean results.

What is a good image size for a website?

For full-width hero images, 1440×810px (16:9) is a solid starting point. For blog thumbnails, 1200×630px matches the OpenGraph standard. Product images typically work well at 800×800px square. Always compress after resizing, ZeroPNG's Image Compressor can reduce file size by up to 90% after resizing.

Can I resize an image without losing quality?

Resizing down (making an image smaller) preserves quality well. The safest approach is to resize to your target dimensions and then export as PNG (lossless) or as WebP/JPEG at high quality (85–95%). Avoid resizing up more than 2× as upscaling creates visible softness.

Tool

Image resizer

Resize any image to exact pixel dimensions. Choose Fit to letterbox, Stretch to fill, or Crop to center-cut. Select a quick preset or enter a custom size. Everything runs in your browser, nothing is uploaded.

No uploadsNo trackingWorks offlineCanvas API

Drop images here

or browse files - PNG, JPG, WebP, AVIF and more

PNGJPGWebPAVIFHEICBMP

How it works

Resize any image in four steps

Set exact pixel dimensions with Fit, Stretch, or Crop mode. Nothing is uploaded anywhere.

Drop your image

Select any PNG, JPG, WebP, or AVIF image. Drop it on the page or click to browse.

PNGJPGWebPAVIF

Enter target dimensions

Type a width and height in pixels, or pick a quick preset like 1920x1080, 1200x630, or 800x800. Lock the ratio to avoid distortion.

Custom pxPresetsAspect lock

Choose a resize mode

Fit keeps the whole image inside the frame with padding. Stretch fills it exactly. Crop fills and trims the edges. Pick what suits your use case.

FitStretchCrop

Download

Click Resize image then download the result. The output matches the exact pixel size you set.

PNGJPGWebP

Resize modes

Fit, Stretch, or Crop?

Each mode handles the space differently when your image and target dimensions have different proportions.

FitNo cropping

Whole image, no distortion

Scales until the longest side hits the target
Remaining space filled with a solid background color
Good for thumbnails where the full image must be visible
Produces letterbox or pillarbox bars if ratio does not match

Good for

Thumbnails, profile pictures, product images

StretchExact fill

Fills exactly, may distort

Forces the image to exactly the target width and height
Ignores the original aspect ratio
Can make subjects look squashed or stretched
Only suitable when distortion does not matter

Good for

Backgrounds, textures, cases where content is abstract

CropRecommended

Fills frame, trims edges

Scales until the image covers the entire target frame
Center-cuts any overflow from the edges
No distortion, no padding bars
Some content near the edges may be lost

Good for

Social media posts, banners, hero images

FAQ

Frequently asked questions

Common questions about resizing images online.

Files never leave your device

Works without an internet connection

Fit, Stretch, and Crop modes

What is the difference between Fit, Stretch, and Crop?

Does resizing reduce image quality?

What are good dimensions for website images?

Can I resize without losing quality?

What is the Fit mode padding color?

Can I resize multiple images at once?

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