Seam Cutter

On 25th October 2026, developer Simon Willison published Seam Cutter, a cropping tool that makes a horizontal or vertical cut across an image and slides the two sides relative to each other, letting users crop out a section in the middle rather than only from the edges. Willison built the tool for his own workflow of stitching iPhone screenshots into long images with Tailor and then removing mid-image content, such as redacting an irrelevant prompt from a transcript.

25th October 2026 I built this weird and very specific cropping tool - it lets you create a horizontal or vertical cut across an image, then slide the two sides relative to each other. Effectively it lets you crop out a section in the middle of an image. I wanted this because I often use Tailor https://apps.apple.com/us/app/tailor-screenshot-stitching/id926653095 on my iPhone to stitch several screenshots together into lot long image, but sometimes I find myself wanting to crop out a section in the middle - to redact an irrelevant prompt from a transcript, for example. Recent articles - Battle Drones - a vibe coded RTS with audio-based multiplayer https://simonwillison.net/2026/Oct/20/battledrones/ - 20th October 2026 - Hello Python 3.15, goodbye 3.10, and now I can use 3.11 https://simonwillison.net/2026/Oct/12/python-3-15/ - 12th October 2026 - A new feature for my blog, built using my voice https://simonwillison.net/2026/Oct/9/built-using-my-voice/ - 9th October 2026 - Claude Haiku 5.5 https://simonwillison.net/2026/Oct/7/claude-haiku-5-5/ - 7th October 2026