converteo.app

Resize Images

Change image dimensions while preserving quality

Processed in your browser — 100% private

Resizing images is essential for website performance, email attachments, social media uploads and printed documents — each context has its own ideal resolution. Our resizer runs in your browser using the Canvas API with high-quality downsampling, so you get sharp results even at large reductions. Resize one image or hundreds in a batch, with or without locked aspect ratio, all without uploading anything.

How to resize images

  1. Drop your images into the window.
  2. Enter a target width and/or height (lock the ratio to keep proportions).
  3. Download each resized image, or all of them as a ZIP.

Supported formats

JPG, PNG, WebP. Output keeps the original format and quality level.

Why resize with converteo.app

  • Images stay on your device — local processing only.
  • Lock aspect ratio to avoid stretching, or unlock for fixed-size outputs.
  • Batch mode applies the same settings to any number of images.
  • No account, no watermark, no upload limit.

Resize Images — Frequently asked questions

Can I resize to a specific file size (e.g. 100 KB)?
Not directly — resizing targets dimensions, not file size. To hit a size target, resize to reasonable dimensions first, then run the result through our Compress Images tool.
Will resizing degrade image quality?
Downscaling uses high-quality sampling and looks excellent. Upscaling (making images larger than the original) will look soft because no additional detail can be invented.
What dimensions should I use for the web?
Common targets: 1920×1080 for hero banners, 1200×630 for social media previews, 600–800 px wide for in-article photos.
Are my images uploaded anywhere?
No. Resizing uses the Canvas API entirely within your browser. No network request carries your image data.