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Image Resizer

Resize images by exact pixels in your browser with aspect-ratio lock, transparent output and format-aware quality controls.

How to Use

  1. 1Drop a JPG, PNG, WebP or another supported image into the upload area and confirm the original dimensions shown below the filename.
  2. 2Set the target width and height with the themed minus/number/plus controls. Keep Lock aspect ratio on for proportional resizing, or turn it off when you need exact independent dimensions.
  3. 3Choose PNG, JPG, WebP, AVIF, BMP, GIF or ICO. Adjust quality, transparency and the background color only when the selected format supports them, then choose a clear output filename.
  4. 4Click Resize image to create a real browser-encoded result. Compare the original and resized previews, check the output dimensions, and retry with a different format or quality when needed.
  5. 5Download the finished file. The image is decoded, resized and encoded locally; no account or server upload is required.

About this tool

Image Resizer is a precise, privacy-first browser tool for preparing images for websites, profiles, documents and thumbnails. It preserves proportions when locked, supports independent dimensions when unlocked, and exposes format-specific options instead of pretending every encoder behaves the same. PNG keeps lossless detail and transparency, JPG is compact for photographs, WebP and AVIF are efficient modern web choices, BMP is uncompressed, GIF exports a single frame, and ICO is intended for small icons. Very large images can use significant device memory.

Example: resize a 2400×1600 JPEG to 1200×800 while keeping its aspect ratio. Very large images may exceed mobile memory.

Frequently Asked Questions