resize_square

Resize an image into a square of the given size (width and height in pixels).

::: success Ready & Demoed :::

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Signature

resize_square(input: Uint8Array, size: number) => Uint8Array

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Parameters

• input — Encoded image bytes (PNG or JPEG).
• size — Desired square dimension in pixels (e.g. 256).

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Returns

• Uint8Array — Encoded PNG bytes of the resized image.

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Example

<input type="file" id="fileInput" />
<button id="downloadBtn" style="display: none;">Download Resized Image</button>

<script type="module">
  import { resize_square } from "wasm-image-processor"

  const input = document.getElementById("fileInput")
  const downloadBtn = document.getElementById("downloadBtn")

  input.addEventListener("change", async (e) => {
    const file = e.target.files[0]
    if (!file) return

    const arrayBuffer = await file.arrayBuffer()
    const uint8Array = new Uint8Array(arrayBuffer)

    // Resize to a 256x256 square
    const resized = resize_square(uint8Array, 256)

    // Create a downloadable blob
    const blob = new Blob([resized], { type: "image/png" })
    const url = URL.createObjectURL(blob)

    // Show download button and set up download
    downloadBtn.style.display = "block"
    downloadBtn.onclick = () => {
      const a = document.createElement("a")
      a.href = url
      a.download = "resized-256x256.png"
      a.click()
      URL.revokeObjectURL(url)
    }
  })
</script>

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Notes

• Input must be a valid image (PNG or JPEG).
• Throws an error if decoding fails — wrap in try/catch when handling untrusted files.
• Output is always PNG regardless of input type.

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Status

✅ Implemented and available now.