Image Resizer

How it works

1. Upload. Choose the image to resize (up to 25 MB).
2. Enter size. Type a width and/or height in pixels. Keep "aspect ratio" ticked to scale proportionally.
3. Download. The resized image downloads automatically using a high-quality Lanczos filter.

About this tool

Resize an image to the exact width and height you need. Enter just a width (or just a height) and keep the box ticked to scale the other side proportionally, or set both and untick it to force precise dimensions. Resizing uses a high-quality Lanczos filter, so downscaled images stay crisp rather than jagged. The output keeps the original format where possible. As always: no watermark, no signup, processed in memory and discarded.

What people use it for

• Fit an image to a forum or marketplace pixel limit
• Make a profile or avatar image a required square size
• Downscale a huge photo for the web without jagged edges
• Standardize a set of images to the same width

Developer API

Automate this tool from your own code. Send a POST request to the endpoint below and get the same result the web tool produces. It is rate-limited per IP and needs no signup — API keys for higher limits are coming.

• cURL
• Python
• JavaScript

curl -X POST https://best.free/api/tools/image-resizer/ \
  -F 'file=@photo.jpg' \
  -F 'width=800' \
  -F 'height=600' \
  -F 'keep_aspect=True' \
  -o resized.png

import requests

files = {"file": open("photo.jpg", "rb")}
data = {"width": 800, "height": 600, "keep_aspect": True}

r = requests.post("https://best.free/api/tools/image-resizer/", files=files, data=data)
with open("resized.png", "wb") as out:
    out.write(r.content)

const fd = new FormData();
fd.append("file", fileInput.files[0]);
fd.append("width", 800);
fd.append("height", 600);
fd.append("keep_aspect", true);

const r = await fetch("https://best.free/api/tools/image-resizer/", { method: "POST", body: fd });
const blob = await r.blob();  // the resized.png

Response: The resized image (same format where possible).

Frequently asked questions