Image tools · Seam carving

Content-aware Seam Carving Resizer

Make an image narrower or shorter by removing the least noticeable paths of pixels. Paint what to protect or remove, and compare the result with the original.

Runs in your browserProtect and remove brushUp to 400 pathsPNG with alpha

ImageChoose imageProjectOpen project

Preparing the sample…

Original

Result

Resize

Remove from width: 0 pxRemove from height: 0 px

Original–

New–

Seams removed0

Paint on the original

Brush size: 24 px

View

Show removed paths on the original Show RGB without alpha Smooth preview

Method and limits

Up to 400 paths per direction on images up to 1,048,576 pixels and 4,096 pixels per edge. Width paths are removed first, using luminance-gradient energy, with no face, text or subject detection, so paint anything important. Content can still distort. Alpha moves with the pixels. PNG files keep their exact RGBA values; metadata and color profiles are not copied. Everything runs in your browser and nothing is saved automatically.

Using Content-aware Seam Carving Resizer

Remove low-energy pixel paths instead of uniformly shrinking an image, preview the result and compare it with the untouched source.

Choose an image, or use the sample that opens with the page.
Drag the width and height sliders and watch the result update.
Paint Protect over anything that must stay, or Remove over what should go first.
Compare with the original, then download the PNG or save a project.

Example

Try the built-in example, inspect the generated image and compare the result after changing one option.

Questions & answers

What does Content-aware Seam Carving Resizer do?

Remove low-energy pixel paths instead of uniformly shrinking an image, preview the result and compare it with the untouched source.

What are the important limitations?

Reduction only, up to 64 seams per axis and one million source pixels. Uses luminance-gradient energy, with no face, text or subject detection. Width seams are removed first; content can distort. Alpha moves with the selected pixels.

Can I save and reopen my work?

Yes. Save a project JSON file containing your inputs, settings and any imported assets. Projects are limited to 40 MiB. Undo/redo stores up to 20 edits in this session and is not saved in the project. There is no automatic saving.

How do imports and output previews work?

Upload still PNG, JPEG, WebP or BMP images. Source images are limited to 1,048,576 pixels and 4,096 pixels per edge. Multiple selected files must total at most 20 MiB. Text previews show up to 150,000 characters; downloads include the complete output. Tables show 50 rows per page; CSV files include all rows.