How to Resize an Image Without Losing Quality (2026 Guide)

How to resize an image without losing quality: make it smaller, not bigger, keep the aspect ratio locked, and use a good resampling method (bicubic or Lanczos). Shrinking a 4000×3000 photo to 2000×1500 keeps it sharp. Enlarging past about 1.5× with normal resizing turns soft, so use an AI upscaler for 2× or 4× instead.

Most quality loss when resizing comes from three avoidable mistakes: stretching the image out of shape, enlarging a small file with basic software, and saving as a heavily compressed JPG afterwards. This guide explains what actually happens to pixels when you resize, then walks through the exact steps in the tools you already have: Photos and Paint on Windows, Preview on a Mac, your phone, GIMP and Photoshop. It ends with how to hit the exact pixel sizes marketplaces ask for.

Why does resizing an image lose quality?

Because resizing recalculates every pixel. When you shrink an image, software merges groups of pixels into fewer pixels, which discards some fine detail but usually looks just as sharp at the new size. When you enlarge, software has to invent pixels that were never captured, so edges blur and textures smear.

There are two other ways quality slips that have nothing to do with size:

• Distortion. Typing a new width and height that don't match the original shape squashes or stretches the image. A round product becomes an oval.
• Compression on save. Every time you save a JPG, it is compressed again. Resize from the original file, not from a copy that has already been saved several times, and pick a high quality setting.

Downscaling vs upscaling: which is safe?

Downscaling (making smaller) is safe; upscaling (making bigger) is where quality is lost. A rule of thumb for normal, non-AI resizing:

Your phone camera already shoots around 4000 pixels wide or more, so for most online uses you are shrinking, which is the easy case. Enlarging only comes up with old photos, supplier images and screenshots.

Which resampling method should I use?

For photos, use bicubic or Lanczos; for pixel art, use nearest neighbor. Resampling (also called interpolation) is the math used to calculate the new pixels. Most apps pick one for you, but GIMP and Photoshop let you choose.

How to resize an image without losing quality, step by step

Every method below follows the same three rules: start from the original file, keep the aspect ratio locked, and save at high quality.

Windows 11: Photos app

1. Open the image in Photos.
2. Click the … (See more) menu and choose Resize image.
3. Choose Pixels, keep Maintain aspect ratio on, and type the new width.
4. Set quality high (90% or above if there's a slider) and save as a copy.

Windows: Paint

1. Open the image in Paint and press Ctrl + W (Resize and Skew).
2. Select Pixels and tick Maintain aspect ratio.
3. Type the new width; the height updates on its own.
4. Use File > Save as and pick PNG for graphics or JPG for photos.

Paint's resampling is basic. It's fine for shrinking, but avoid it for enlarging.

Mac: Preview

1. Open the image in Preview, then choose Tools > Adjust Size.
2. Set the unit to pixels, tick Scale proportionally and Resample image.
3. Type the new width and click OK.
4. Use File > Export, choose JPEG with the quality slider near Best, or PNG.

iPhone and Android

The built-in photo apps crop but don't offer a simple pixel resize. On iPhone, the free Shortcuts app has a Resize Image action you can run from the share sheet. Many Samsung phones have a Resize option in the Gallery menu. Otherwise, a browser tool works on any phone; our free image compressor can cap the longest side (for example at 2000 px) and convert iPhone HEIC photos to JPG at the same time.

GIMP (free, Windows/Mac/Linux)

1. Open the image and choose Image > Scale Image.
2. Make sure the chain icon between width and height is linked.
3. Type the new width in pixels.
4. Set Interpolation to NoHalo or LoHalo (or Cubic).
5. Click Scale, then File > Export As and choose JPG quality 90 or PNG.

Photoshop

1. Choose Image > Image Size (Alt+Ctrl+I on Windows, Option+Cmd+I on Mac).
2. Keep the link icon on so width and height stay proportional, and set units to pixels.
3. Tick Resample. Pick Bicubic Sharper for shrinking or Preserve Details 2.0 for enlarging; Automatic is a sensible default.
4. Click OK and export with File > Export > Export As.

How do I make an image bigger without losing quality?

Use AI upscaling. Normal resizing stretches existing pixels; an AI upscaler is trained on millions of images and redraws edges, text and texture at the larger size, so a 2× or 4× enlargement can look like it was shot that way. It works best on photos that are small but in focus. It can't recover detail that a badly blurred photo never had.

Our AI image upscaler enlarges an image to 4× its resolution for 3 credits, so a 500 px supplier photo becomes 2000 px. For a fuller comparison of upscaling methods and print sizes, see how to make a picture higher resolution, and for product photos specifically, how to upscale product photos.

How do I resize to an exact size like 2000×2000?

Resize the long side first, then pad or extend the canvas to the target shape; never type both numbers into an unlocked resize box. If your photo is 3:4 and the target is square, forcing both sides to 2000 squashes it. You have three honest options:

• Crop to the new shape, for example with our free image cropper. Fast, but it removes part of the photo.
• Pad the photo onto a canvas of the exact size and fill the gap with white, a color or a blur. Nothing is cut or distorted.
• Extend the background with AI so the new space looks like part of the original scene.

Our free marketplace image resizer has presets for Amazon 2000×2000, Shopify 2048×2048, Etsy 2000×1600, eBay 1600×1600 and social sizes, plus custom sizes up to 8000 px. It pads or crops in your browser and downloads JPG or PNG. When padding looks wrong, for example a lifestyle photo going into a 9:16 story, the AI image extender fills the extra space with matching background (8 credits per size). The aspect ratio guide lists which shape each channel wants.

Does changing DPI change image quality?

No. DPI (or PPI) is a print instruction, not a quality setting. A 2000×2000 image at 72 DPI and the same image at 300 DPI look identical on screen and upload identically to any marketplace. DPI only matters when printing: divide pixels by 300 to get the sharp print size in inches. If a print shop asks for 300 DPI, what they really need is enough pixels.

What format should I save a resized image in?

JPG at 85–92% quality for photos, PNG for graphics, logos and anything with transparency, and WebP for your own website. Saving at 100% JPG quality makes huge files with no visible gain; dropping below about 75% shows blocky artifacts around edges. Our guide to JPG vs PNG vs WebP covers which one each marketplace prefers.

Quick checklist

1. Start from the original, full-size file.
2. Crop and color-correct before resizing.
3. Lock the aspect ratio.
4. Shrink freely; enlarge by more than 1.5× only with AI upscaling.
5. Use bicubic or Lanczos for photos.
6. Need an exact shape? Pad or extend, don't stretch.
7. Save once at high quality, in the right format.

Frequently asked questions

How do I resize an image without losing quality?

Make it smaller rather than bigger, keep the aspect ratio locked, use bicubic or Lanczos resampling, and save at high quality (JPG 85–92% or PNG). To enlarge more than about 1.5×, use an AI upscaler instead of normal resizing.

Can you make a picture bigger without losing quality?

Not with ordinary resizing, which only stretches existing pixels. AI upscalers can enlarge an image 2× or 4× while redrawing edges and texture, which looks far sharper, as long as the original was reasonably in focus.

Does resizing a photo reduce its quality?

Shrinking a photo barely affects how sharp it looks at the new size. Enlarging, stretching it out of shape, or re-saving a JPG many times are what reduce quality.

What is the best free tool to resize images?

Preview on a Mac and Photos or Paint on Windows handle simple resizing. GIMP is free and gives you control over resampling. For exact marketplace sizes, a browser resizer with channel presets saves time.

How do I resize an image on iPhone?

The Photos app can crop but not set pixel sizes. Use the Resize Image action in the free Shortcuts app, or a browser-based resizer, and keep the aspect ratio locked.

Is 72 DPI or 300 DPI better for the web?

It makes no difference online. Screens and marketplaces use pixel dimensions only. DPI matters only for printing, where 300 pixels per inch gives a sharp result.