Ultraconvert
Join
100% client-side — your images never leave your device

Compress images,
without the upload.

Shrink and resize JPG, PNG and WEBP — right in your browser. Drag, drop, done.

How it works

  1. 1

    Drop your images

    Add JPG, PNG, WEBP, GIF or BMP files — they're decoded locally, no upload.

  2. 2

    Pick quality & size

    Lower the quality, cap the longest side, or switch format (e.g. PNG → WEBP) to shrink more.

  3. 3

    Download

    See how much each file shrank, then download one image or all of them as a zip.

Frequently asked questions

Are my images uploaded to a server?+

No. Images are compressed and resized entirely in your browser using canvas. Your files never leave your device.

How do I make a PNG smaller?+

PNG is lossless, so the quality slider doesn't apply. Resize it (cap the longest side), or switch the output to JPG or WEBP for a much smaller file.

Does resizing keep the aspect ratio?+

Yes. The longest-side limit scales the image down proportionally and never upscales beyond the original.

Is it free?+

Yes — free, no signup, no watermarks.