Image tools
Batch convert, compress, resize and remove backgrounds — even iPhone HEIC. 100% in your browser, nothing uploaded.
Drop images here, or click to choose
Multiple files OK · PNG · JPEG · WebP · AVIF · HEIC · GIF — stays on your device
🔒 Every image is processed locally in your browser (Canvas · libheif · onnxruntime) — nothing is ever uploaded.
Convert, compress & resize images in your browser
Poly3D's image tools run entirely on your own device. Drag in one photo or a whole batch, pick an output format (PNG, JPEG or WebP), dial in quality, and resize by percentage or by longest side — then download everything as a .zip. Because the work happens in the browser with the Canvas API and WebAssembly, your pictures are never uploaded, which makes this a safe way to shrink screenshots, prepare web images, or convert iPhone HEIC photos.
Frequently asked questions
- Are my images uploaded to a server?
- No. Every image is processed locally in your browser using the Canvas API (and WebAssembly for HEIC decoding and background removal). Your files never leave your device.
- Which formats can I convert between?
- You can export to PNG, JPEG and WebP (and AVIF where your browser can encode it). Input can be any image your browser reads, including iPhone HEIC/HEIF, PNG, JPEG, WebP, GIF and BMP.
- Can I compress or resize many images at once?
- Yes. Drop multiple images, choose one set of settings (format, quality, resize), process them all, and download the results together as a .zip file.
- How does “remove background” work?
- It runs an AI segmentation model (ONNX) directly in your browser to cut out the main subject and export a transparent PNG. The first run downloads the model once; nothing is sent to a server.
- Does resizing reduce quality?
- Making an image smaller keeps it sharp. The tool never enlarges beyond the original in “max side” mode, so you avoid blurry upscaling.