Uwarp

Output: 256×256 px · cover

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Resize image to 256×256

256x256 image converter online. Cover, contain, or stretch any photo to 256 x 256. Download PNG or JPG. Local-first, no sign-in.

What is a 256×256 image converter?

A 256×256 image converter turns any photo or graphic into a square that is exactly 256 x 256 pixels. People search for “256 x 256”, “256x256 images”, and “256x256 image converter” when icons, textures, or thumbnail grids require that power-of-two size. This free local-first tool covers, contains, or stretches the source into the square and lets you download PNG or JPG—resizing cannot invent detail that was never in the original.

256×256 resize features

A fixed square export for 256×256 images.

  • Exact 256×256 output

    Every download is 256 x 256—no guessing sliders.

  • Cover, contain, stretch

    Match CSS-style object-fit behavior for square tiles.

  • PNG or JPG download

    Keep transparency with PNG, or export a solid JPG square.

  • Local-first

    Preview and export in the browser with no signup.

How to resize an image to 256×256

From any photo to a 256×256 square.

  1. Add an image

    Drop a JPG, PNG, or WebP, or pick an example.

  2. Choose fit mode

    Cover to fill the square, contain to keep the whole frame, or stretch.

  3. Download 256×256

    Save the square as PNG or JPG for icons and textures.

Tips for 256×256 images

Cleaner power-of-two exports.
  • 01

    Center the subject before cover

    Cover crops from the center. Keep faces and logos near the middle.

  • 02

    Start larger when possible

    Upscaling a tiny source softens detail. Prefer a source bigger than 256 px.

  • 03

    Use PNG for soft edges

    Icons and logos with alpha look better as PNG than JPG at 256×256.

  • 04

    Need 250×250 instead?

    Use Resize Image to 250×250, or Resize Image for any custom size.

256×256 resize vs other tools

When this locked square helps.

  • Resize Image

    Any width and height. Use this page when you only want 256×256.

  • Resize to 250×250

    Same workflow for a 250 px square when a form asks for 250×250 instead.

  • Square Crop

    Manual 1:1 crop with handles. Here the canvas size is fixed at 256 px.

Great for

Jobs that ask for a 256×256 image.

  • Icons and app assets

    Export a power-of-two square at 256 x 256.

  • Game and texture slots

    Match pipelines that expect 256×256 images.

  • Thumbnails and avatars

    Fill uniform grids that need a 256×256 converter output.

Why resize to 256×256 here

Fast fixed-size export.

  • Free

    Unlimited 256×256 exports with no signup.

  • Local-first

    Images stay in the browser for this tool.

  • No watermark

    Clean PNG or JPG downloads.

  • Locked square

    Skip dimension math—output is always 256×256.

Technical notes

How the 256×256 export is built.
Output size
Fixed 256×256 canvas every run (power of two).
Fit modes
Cover, contain, and stretch drawn with the Canvas 2D API.
Padding
Contain mode supports transparent alpha or a solid fill color.
Privacy
Client-side only—no network upload.

Sources & References

References on square sizing and canvas drawing.
  • “The object-fit CSS property sets how the content of a replaced element should be resized to fit its container.”
    — MDN Web Docs — object-fit

    CSS object-fit: Cover and contain modes mirror CSS object-fit inside a 256×256 square. developer.mozilla.org/en-US/docs/Web/CSS/object-fit

  • “The Canvas API provides a means for drawing graphics via JavaScript and the HTML canvas element.”
    — MDN Web Docs — Canvas API

    Canvas API: This tool draws the source scaled into a fixed 256×256 canvas. developer.mozilla.org/en-US/docs/Web/API/Canvas_API

  • “A power of two is a number of the form 2ⁿ where n is an integer.”
    — Wikipedia — Power of two

    Power of two: 256 = 2⁸, a common texture and icon edge length in graphics pipelines. en.wikipedia.org/wiki/Power_of_two

Frequently Asked Questions

Quick answers about this tool—open a question to read more.