Free tool · 100% private
Resize & Convert Image
Resize by pixels or percentage, convert between PNG, JPEG and WebP, or crop to any aspect. Everything runs inside your browser: your image is never uploaded, so nothing can leak. It even works offline.
Choose an image or drop it here
JPG · PNG · WebP — one image · it stays on your device
What do you want to do?
Lock keeps the width and height proportional. Presets set the width and match the height automatically — the passport preset sets an exact size.
Your image keeps its original size — just pick an output format below to convert it. Great for turning a PNG screenshot into a smaller JPEG, or a JPEG into a modern WebP.
Aspect
Drag to move the crop box · pull the handles to resize it.
Output format
90%
Processing your image…
Working entirely on your device
🔒 Nothing is uploaded — this all happens on your device
- ✓Reading your image on this device
- ✓Rendering it on the canvas
- ✓Verifying the result decodes
- ✓Finalising your download
Done & verified
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How to resize or convert an image (without uploading it)
Most "image resizer" websites upload your photo to their servers, process it there, and send it back — then promise to delete it later. This one is different: it does the whole job on your device, and it checks its own work before handing you the file.
- 1Add your image. Drag it onto the box or click to pick. It loads straight into your browser's memory — nothing is sent anywhere.
- 2Resize, convert or crop. Set a new size in pixels or as a percentage (with the aspect ratio locked), pick PNG, JPEG or WebP, or switch to Crop and drag a crop box with presets like 1:1 or 16:9.
- 3Process, verify & download. Your browser renders the image, re-opens the result to confirm it decodes as a valid image, then gives you a download button.
Why this is safer. Since the tool never uploads your image, there is no copy of it on any server to be hacked, cached, indexed, or leaked. And because it verifies the output before download, you never get a silently corrupted file.
Frequently asked questions
Are my images uploaded to a server?
No. This tool runs 100% in your browser using the HTML canvas. Your image is read into your device's memory and resized, converted or cropped locally — it's never sent to any server, so there's no way for it to leak. It even works offline once the page has loaded.
What can this tool do?
Three things, all on your device. Resize by exact pixels or by a percentage, with an aspect-ratio lock and handy presets. Convert between PNG, JPEG and WebP, with a quality slider for the lossy formats. And Crop with aspect presets like 1:1, 4:3 and 16:9, plus rotate and flip.
Will resizing reduce my image quality?
Shrinking an image stays crisp — the tool uses high-quality smoothing. Enlarging past the original always adds softness because there's no extra detail to invent, so we show a note when you go beyond 2× the original size. For JPEG and WebP there's also a quality slider.
What happens to transparency when I convert to JPEG?
JPEG has no transparency, so any transparent areas are filled with white. If you need to keep transparency, choose PNG or WebP as the output format instead.
Is it really free?
Yes — completely free, no sign-up, no watermark, no account limits. It's part of AttendFlow's free student tools.
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