#image-resizer {
max-width: 950px;
margin: 20px auto;
padding: 25px;
background: #f5f7fb;
border-radius: 15px;
font-family: Arial, sans-serif;
color: #222;
box-sizing: border-box;
}
#image-resizer * { box-sizing: border-box; }
#image-resizer .tool-title {
text-align: center;
font-size: 27px;
font-weight: 700;
margin-bottom: 10px;
color: #172554;
}
#image-resizer .tool-desc {
text-align: center;
color: #64748b;
margin-bottom: 22px;
}
#image-resizer .upload-area {
border: 2px dashed #2563eb;
border-radius: 12px;
padding: 30px 15px;
text-align: center;
background: white;
margin-bottom: 22px;
}
#image-resizer input[type=file] {
max-width: 100%;
margin-top: 12px;
}
#image-resizer .section-title {
font-size: 19px;
font-weight: bold;
margin: 22px 0 12px;
color: #172554;
}
#image-resizer .button-grid {
display: grid;
grid-template-columns: repeat(auto-fit,minmax(95px,1fr));
gap: 10px;
}
#image-resizer button {
border: none;
border-radius: 8px;
padding: 13px 9px;
background: #2563eb;
color: white;
font-size: 14px;
font-weight: bold;
cursor: pointer;
transition: .2s;
}
#image-resizer button:hover {
background: #1d4ed8;
transform: translateY(-2px);
}
#image-resizer button:disabled {
opacity: .5;
cursor: not-allowed;
transform: none;
}
#image-resizer .preset-btn {
background: #0f766e;
}
#image-resizer .preset-btn:hover {
background: #115e59;
}
#image-resizer .preview-box {
background: white;
border-radius: 12px;
padding: 15px;
margin-top: 22px;
text-align: center;
display: none;
}
#image-resizer .preview-box img {
max-width: 100%;
max-height: 350px;
object-fit: contain;
border-radius: 8px;
margin: 10px auto;
}
#image-resizer .result-info {
line-height: 1.8;
color: #334155;
overflow-wrap: anywhere;
}
#image-resizer .download-btn {
display: inline-block;
margin-top: 12px;
padding: 13px 25px;
background: #16a34a;
color: white;
text-decoration: none;
border-radius: 8px;
font-weight: bold;
}
#image-resizer .download-btn:hover {
background: #15803d;
}
#image-resizer .status {
text-align: center;
margin: 15px 0;
font-weight: bold;
color: #2563eb;
}
#image-resizer .note {
font-size: 13px;
color: #64748b;
margin-top: 18px;
line-height: 1.6;
}
@media(max-width:500px) {
#image-resizer { padding: 15px; }
#image-resizer .tool-title { font-size: 22px; }
}
Final File Size: " + sizeKB + " KB" + "
Image Dimensions: " + resultImg.naturalWidth + " × " + resultImg.naturalHeight + "
Format: JPG"; download.href = url; download.download = originalName + "-resized.jpg"; preview.style.display = "block"; status.textContent = "Your image is ready to download."; } root.querySelectorAll("[data-kb]").forEach(button => { button.addEventListener("click", function () { resizeKB(Number(this.dataset.kb)); }); }); root.querySelector('[data-preset="youtube"]') .addEventListener("click", function () { resizePreset(1280, 720, "YouTube Thumbnail"); }); root.querySelector('[data-preset="instagram"]') .addEventListener("click", function () { resizePreset(1080, 1080, "Instagram Post"); }); })();
Image Resizer Online
Resize and compress your images to your required size.
Upload Your Image
Select an image from your device
Resize Image by KB
Social Media Image Resizer
Note: Images are processed in your browser. KB options represent
maximum file sizes. JPEG format is used for compressed downloads.
Transparent areas in uploaded images will have a white background.
(function () {
const root = document.getElementById("image-resizer");
const fileInput = root.querySelector("#ir-file");
const status = root.querySelector("#ir-status");
const preview = root.querySelector("#ir-preview");
const resultImg = root.querySelector("#ir-result-img");
const info = root.querySelector("#ir-info");
const download = root.querySelector("#ir-download");
let originalImage = null;
let originalName = "image";
function setBusy(busy, message) {
root.querySelectorAll("button").forEach(btn => {
btn.disabled = busy;
});
status.textContent = message || "";
}
fileInput.addEventListener("change", function () {
const file = this.files[0];
if (!file) return;
if (!file.type.startsWith("image/")) {
status.textContent = "Please select a valid image.";
return;
}
const reader = new FileReader();
reader.onload = function (event) {
const img = new Image();
img.onload = function () {
originalImage = img;
originalName = file.name.replace(/\.[^.]+$/, "") || "image";
status.textContent =
"Image uploaded successfully: " +
img.width + " × " + img.height + " pixels";
preview.style.display = "none";
};
img.onerror = function () {
status.textContent = "Unable to read this image.";
};
img.src = event.target.result;
};
reader.onerror = function () {
status.textContent = "Unable to load the selected file.";
};
reader.readAsDataURL(file);
});
function makeCanvas(width, height) {
const canvas = document.createElement("canvas");
canvas.width = Math.max(1, Math.round(width));
canvas.height = Math.max(1, Math.round(height));
const ctx = canvas.getContext("2d");
ctx.fillStyle = "#ffffff";
ctx.fillRect(0, 0, canvas.width, canvas.height);
ctx.drawImage(originalImage, 0, 0, canvas.width, canvas.height);
return canvas;
}
function toBlob(canvas, quality) {
return new Promise(resolve => {
canvas.toBlob(resolve, "image/jpeg", quality);
});
}
// Find the highest JPEG quality that stays under the target.
async function compressToLimit(width, height, maxBytes) {
for (let attempt = 0; attempt < 35; attempt++) {
const canvas = makeCanvas(width, height);
let low = 0.01;
let high = 0.95;
let bestBlob = null;
for (let i = 0; i < 12; i++) {
const quality = (low + high) / 2;
const blob = await toBlob(canvas, quality);
if (!blob) throw new Error("Image compression failed.");
if (blob.size <= maxBytes) {
bestBlob = blob;
low = quality;
} else {
high = quality;
}
}
if (bestBlob) return bestBlob;
// If quality alone is insufficient, reduce dimensions.
width *= 0.82;
height *= 0.82;
if (width < 1 || height targetRatio) {
sw = originalImage.height * targetRatio;
sx = (originalImage.width - sw) / 2;
} else {
sh = originalImage.width / targetRatio;
sy = (originalImage.height - sh) / 2;
}
const canvas = document.createElement("canvas");
canvas.width = width;
canvas.height = height;
const ctx = canvas.getContext("2d");
ctx.drawImage(
originalImage,
sx, sy, sw, sh,
0, 0, width, height
);
const blob = await toBlob(canvas, 0.90);
if (!blob) throw new Error("Image processing failed.");
showResult(blob, name + " (" + width + " × " + height + ")");
} catch (error) {
status.textContent = error.message;
} finally {
setBusy(false, status.textContent);
}
}
function showResult(blob, description) {
const url = URL.createObjectURL(blob);
if (resultImg.dataset.previousUrl) {
URL.revokeObjectURL(resultImg.dataset.previousUrl);
}
resultImg.src = url;
resultImg.dataset.previousUrl = url;
const sizeKB = (blob.size / 1024).toFixed(2);
info.innerHTML =
"Operation: " + description +
"Final File Size: " + sizeKB + " KB" + "
Image Dimensions: " + resultImg.naturalWidth + " × " + resultImg.naturalHeight + "
Format: JPG"; download.href = url; download.download = originalName + "-resized.jpg"; preview.style.display = "block"; status.textContent = "Your image is ready to download."; } root.querySelectorAll("[data-kb]").forEach(button => { button.addEventListener("click", function () { resizeKB(Number(this.dataset.kb)); }); }); root.querySelector('[data-preset="youtube"]') .addEventListener("click", function () { resizePreset(1280, 720, "YouTube Thumbnail"); }); root.querySelector('[data-preset="instagram"]') .addEventListener("click", function () { resizePreset(1080, 1080, "Instagram Post"); }); })();