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Image Resizer

Resize images to custom dimensions

How to Use Image Resizer

  1. Upload the image you want to resize.
  2. Enter a new width or height in pixels.
  3. Keep the aspect ratio lock on so the other dimension follows automatically.
  4. Resize and download.

About Image Resizer

What this page solves

Resizing online usually means uploading a photo to an unknown server. This tool resizes JPG, PNG and WebP locally to exact pixel dimensions, with optional aspect-ratio lock and no quality loss.

Image Resizer rewrites JPG, PNG and WebP files to exact pixel dimensions in your browser using the Canvas API's high-quality bilinear scaler — the same pipeline a desktop editor uses — so a 4032 × 3024 phone photo becomes a clean 1200 × 630 Open Graph image without re-uploading or losing detail. It exists for the people Photoshop is overkill for: marketers preparing Instagram 1080 × 1080 posts, YouTubers cutting 1280 × 720 thumbnails, developers exporting OG previews, and anyone resizing confidential screenshots that should not pass through a third-party server. Aspect-ratio lock prevents accidental stretching, and percentage-based scaling lets you halve a folder of camera photos in one click. Chain it with the Image Compressor to drop file size after the dimension change, or with the Image Cropper when you need a specific framing instead of a uniform scale. Runs entirely in your browser — no upload, no signup, no logs.

Common Use Cases

  • Resize an image to 1080 × 1080 for Instagram
  • Generate a 1200 × 630 Open Graph image for social previews
  • Downscale 4K photos to web-friendly 1920 × 1080
  • Create 1280 × 720 YouTube thumbnails from any source image
  • Resize confidential screenshots without uploading them anywhere

Related tools in Image Tools

See all Image Tools.

Frequently asked questions

Why does my enlarged image look blurry?

Enlarging invents pixels by interpolating between existing ones. The detail was never in the file, so it cannot be recovered — this is true of every resizing tool, not a limitation of this one. Start from the highest-resolution original you have.

What size should I use for a website?

Roughly twice the display size, to stay sharp on retina screens. If an image displays 600 pixels wide, export at 1200. Going beyond that wastes bandwidth without any visible benefit.

Will resizing reduce file size?

Substantially. File size scales roughly with pixel count, so halving both dimensions cuts the pixel count to a quarter. Resizing is usually more effective than compression for large photographs.

Can I resize to an exact size in KB?

Not with this tool — it works in pixel dimensions. Use the Image Compressor, which has a target size mode that finds the quality level to hit a specific file size.

How to use Image Resizer?

1) Open the tool. 2) Enter or upload your input. 3) Get your result instantly. Everything happens locally — nothing is uploaded.

When should I use Image Resizer?

Use it when you need a precise pixel size — Instagram 1080 × 1080, Facebook cover 820 × 312, OG image 1200 × 630, or YouTube thumbnail 1280 × 720.

Is Image Resizer safe?

Yes. Image Resizer runs 100% in your browser. Inputs are never uploaded, stored, or logged — safe for confidential content.

Will quality be affected by Image Resizer?

Quality is preserved unless you explicitly choose a lossy format or low quality setting.

What formats does Image Resizer support?

Image Resizer supports JPG, PNG, WebP, GIF, BMP and SVG (where applicable)

Is Image Resizer free?

Yes — Image Resizer is completely free, with no registration, no watermarks, and no usage limits.

Can I lock the aspect ratio?

Yes. Toggle the aspect-ratio lock and the second dimension updates automatically when you type the first, so the image never stretches or squashes.

Will resizing reduce quality?

Downscaling is effectively lossless — extra pixels are averaged into the output. Upscaling cannot invent detail, so we cap recommendations at 2× the source size.

Can I resize by percentage instead of pixels?

Yes. Switch to percentage mode to scale by 25%, 50%, or any custom value — useful for halving a folder of camera photos without computing exact dimensions.