📐 Image Resizer
Upload an image, set the target width and height in pixels (lock the ratio to keep it automatic), choose PNG or JPEG, tick black & white, then preview and download. Local only, no upload.
No image selected yet
❓ Frequently asked questions
Is my image uploaded?
No. All processing happens in your browser with Canvas; nothing is sent to a server.
Which formats are supported?
Input: any image your browser can decode (JPG/PNG/WebP/GIF first frame, etc.). Output: PNG or JPEG.
How does black & white work?
Each pixel is converted to grayscale using l = 0.299R + 0.587G + 0.114B, applied to all three channels.
Why does JPEG get a white background?
JPEG has no transparency, so transparent areas become white. Use PNG if you need to keep transparency.
📚 How to use
Resize, convert format and go black & white in one place.
Steps
- Click or drag an image into the dashed box.
- Enter target width/height (with Lock ratio on, changing one updates the other).
- Pick PNG/JPEG, quality (JPEG only) and black & white.
- Click Preview, then Download image when happy.
About this tool
Photos straight from a phone are huge. Your website, your email, your chat — none of them want a 12 MB file.
This resizer shrinks dimensions to what you actually need: a thumbnail, a header, a print size. Set the width, keep the ratio, export.
Great before uploading to a store, a blog, or sending a batch by email.
Local only; the image never leaves your device.
Your pictures stay private. (We run anonymous analytics — privacy policy.)
Tip: resize once, then compress — doing both gives the smallest clean result. Enjoy.