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MondayKit

Resize images online

Set exact pixel dimensions, scale by percentage, or pick a social media preset.

Processed in your browser. Files are never uploaded.

or drop files here, or paste

How to resize images online

  1. Choose or paste an image.

  2. Pick pixels, percentage, or a preset such as Instagram post.

  3. Lock the aspect ratio if you do not want the image stretched.

  4. Click Resize and download in the same format.

  • No upload

    Your files are processed on your device and never sent anywhere.

  • Free, no signup

    No account, no watermark and no daily limit.

  • Fast

    No upload or download wait – results appear in seconds.

What is Resize image?

Resize image changes the pixel dimensions of a picture with high-quality resampling (pica, using Lanczos filtering), which keeps edges sharp when downscaling. Output dimensions are exactly what you type.

When to use it

  • Make a profile picture the exact size a site requires.
  • Prepare images for Instagram, YouTube thumbnails or LinkedIn banners.
  • Shrink large camera photos for a blog.
  • Create consistent product image sizes for a shop.

Tips for the best result

  • Lock aspect ratio to avoid stretching; unlock for exact boxes.
  • Enlarging beyond 200% will look soft – resizing cannot add detail.
  • Compress after resizing for the smallest files.

Limits and privacy

Output keeps the input format. Animated GIFs become a still image. Processing happens entirely in your browser, so your data never leaves your device and there is nothing to sign up for. Files are processed in your browser and never uploaded.

Many people who use Resize image also need Compress image or Crop image, and Image converter is one click away. Every MondayKit tool works the same way – open the page, add your input, get the result – with no account, no watermark and no upload.

Frequently asked questions

How do I resize without stretching?

Keep “Lock aspect ratio” on. When you change the width, the height follows automatically.

How do I resize to a specific pixel size?

Choose Pixels, turn off the aspect lock if needed, and type the exact width and height.

What size is best for Instagram?

1080 × 1080 for square posts, 1080 × 1350 for portrait posts and 1080 × 1920 for stories. All are in the presets.

Will resizing reduce file size?

Smaller dimensions usually mean a smaller file. Use Compress image for further savings.

Related tools

Compress imageShrink JPG, PNG and WebP file size with a quality or target size.Crop imageCrop images freely or to 1:1, 4:3, 16:9 and more.Image converterConvert between JPG, PNG and WebP (and read GIF/BMP).Exam photo & signature resizerResize photos and signatures to SSC, UPSC, IBPS, NEET and JEE specs.Rotate / flip imageRotate images 90° or flip them horizontally or vertically.

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