Images stay on your deviceOn device

Get your images ready. Right in your browser.

Convert, compress, crop, and resize images. Your files stay on your device.

Choose a toolHow local processing works
  • Images are processed on your device, never uploaded
  • No account required
CanvasOtter mascot: an otter holding up a picture frame

Choose a tool

Convert

Convert to WebPTurn PNG and JPG images into smaller WebP files, with transparency kept.PNG to JPGConvert PNGs to JPG and choose the color that fills transparent areas.

Compress

Compress PNGAutomatically reduce PNG file size without losing quality.Compress to sizeGet images under a limit like 200 KB for forms, email, and uploads.

Resize & crop

Resize imageChange dimensions by pixels or percentage, for one image or a batch.Crop imageCut an image to a freeform area or an exact aspect ratio.

Canvas & spacing

Trim transparent pixelsRemove empty transparent edges around icons, logos, and cutouts.Add paddingAdd even spacing, or place images on canvases of the same size.

Featured workflow

Prepare a batch of transparent assets

Icons and cutouts often arrive with uneven empty edges. Run them through four tools in order. After each step, choose the next tool and your images come along — within this browser tab only. Nothing is uploaded between steps, and you can choose whether the next tool receives the processed results or your original files.

  1. 1Trim empty edges

    Cut away transparent margins so every asset starts tight to its content.

    640 × 480 → 240 × 240

  2. 2Add consistent padding

    Give each asset the same breathing room — 29 px on every side.

    240 × 240 → 298 × 298

  3. 3Resize

    Scale everything to one size, keeping the aspect ratio locked.

    298 × 298 → 256 × 256

  4. 4Export as WebP

    Save smaller files with transparency kept, ready for web or app.

    256 × 256

Start with Trim transparent pixelsSample dimensions are illustrative.

How local processing works

CanvasOtter's tools run inside your browser tab. When you choose an image, your browser reads it from your device, processes it with your device's memory and processor, and saves the result to your downloads.

The website itself loads like any other site — pages, fonts, and scripts come from our server. Your images never travel the other way.

  1. Selecting a file doesn't upload itThe image is opened by your browser, the same way it shows a photo from your computer.
  2. Speed depends on your deviceLarge batches and very large images take longer on older phones. If an image is too large for your device's memory, we'll say so and skip it — other files keep going.
  3. Results are cleared when you close the tabDownload what you need before leaving. Nothing is saved on our servers.