Remove EXIF data from JPEG using JavaScript - simple and extremely fast

removeExifFromJpeg.js

// Code mostly written by GPT-4. Works well for me, but not extensively tested (e.g. on old or weird jpeg files)
function removeExifFromJpeg(arrayBuffer) {
  let view = new DataView(arrayBuffer);

  // Check if it's a JPEG file
  if (view.getUint16(0, false) !== 0xFFD8) {
    throw new Error("Not a valid JPEG");
  }

  let position = 2; // Start after the SOI marker

  while (position < view.byteLength - 2) {
    let marker = view.getUint16(position, false);

    // If it's the Exif segment (APP1), remove it
    if (marker === 0xFFE1) {
      let length = view.getUint16(position + 2, false);
      let buf1 = new Uint8Array(arrayBuffer.slice(0, position));
      let buf2 = new Uint8Array(arrayBuffer.slice(position + length + 2));
      let result = new Uint8Array(buf1.length + buf2.length);
      result.set(buf1, 0);
      result.set(buf2, buf1.length);
      return result.buffer;
    }

    // Increment by segment length if it's an APPn segment
    if (marker >= 0xFFE0 && marker <= 0xFFEF) {
      position += view.getUint16(position + 2, false) + 2;
    } else {
      position += 2;
    }
  }

  // If no Exif data found, return the original buffer
  return arrayBuffer;
}