diff --git a/src/attachments.js b/src/attachments.js
index 363a102..3b44bd9 100644
--- a/src/attachments.js
+++ b/src/attachments.js
@@ -7,7 +7,7 @@ export async function toAttach(file, opts) {
     const name = file.name || 'file', mime = (file.type || 'application/octet-stream').toLowerCase();
     if (isVideo(name, mime)) return compressVideo(file, opts);
     if (/^image\//.test(mime) || /\.(png|jpe?g|webp|gif)$/i.test(name)) {
-      const data = mime === 'image/webp' || /\.webp$/i.test(name) ? await asDataURL(file) : await imgToWebp(file, 2048, 94);
+      const data = await imgToWebp(file, 2048, 94, mime === 'image/webp' || /\.webp$/i.test(name));
       return { type: 'image_url', image_url: { url: data } };
     }
     if (mime === 'application/pdf' || /\.pdf$/i.test(name)) {
diff --git a/src/utils.js b/src/utils.js
index 944db57..6747b8f 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -16,12 +16,13 @@ export const fmtSize = b => {
   return (x >= 10 ? Math.round(x) : Math.round(x * 10) / 10) + ' ' + u[i];
 };
 export const asDataURL = f => new Promise(r => { const fr = new FileReader(); fr.onload = () => r(String(fr.result || '')); fr.readAsDataURL(f); });
-export const imgToWebp = (f, D = 96, q = 75) => new Promise((r, j) => {
+export const imgToWebp = (f, D = 96, q = 75, k) => new Promise((r, j) => {
   if (!f) return j();
   const i = new Image;
   i.onload = () => {
-    const c = document.createElement('canvas'), x = c.getContext('2d');
     let w = i.width, h = i.height;
+    if (k && Math.max(w, h) <= D) return URL.revokeObjectURL(i.src), r(asDataURL(f));
+    const c = document.createElement('canvas'), x = c.getContext('2d');
     if (D > 0 && Math.max(w, h) > D) w > h ? (h = D * h / w, w = D) : (w = D * w / h, h = D);
     c.width = w; c.height = h; x.drawImage(i, 0, 0, w, h);
     r(c.toDataURL('image/webp', clamp(q, 0, 100) / 100));