Free tools / 𝕏 header maker for builders
Make an 𝕏 header for what you are building
Type your project's name, one line on what it does and your stack. The header shows them on one of Crux's themes, and you download it as a 1500 × 500 PNG to upload as your profile header.
Updated
Everything runs in your browser. What you paste is not sent to Crux or anyone else, and nothing is saved.
How it works
A profile header is the first thing people see after your name, so a builder's header can say what you are working on. This tool draws a 1500 × 500 pixel image (a 3:1 header) in your browser: a line such as Currently building, the project's name, what it does, and up to eight stack items as chips. The text starts past the left third of the image and stays away from the edges, and anything too long is cut with an ellipsis rather than squeezed. Upload the PNG from your profile's edit screen on 𝕏.
Questions
What size is the header?
1500 × 500 pixels, a 3:1 image, saved as a PNG. Upload it as your header from your profile's edit screen on 𝕏.
Why is the text on the right?
So the left third and the edges stay free of text. Your profile photo and the way different screens crop a header can cover parts of it; keeping the text toward the middle right leaves room for both.
How many stack items fit?
Up to eight, in at most two rows. When the names are long and some do not fit, the page says how many were left out, in the order you typed them.
Does it change my 𝕏 profile?
No. It only makes the image. Nothing here connects to your 𝕏 account; you upload the header yourself.
From one post to every push
Crux (cruxpost.com) watches the GitHub repos you choose. Each push, merged pull request or release becomes three drafts in your voice, checked the way this site’s tools check a post, and your coding agent can add why a change matters through the Crux plugin for Claude Code and Codex. Crux reads commit messages, pull request and release text and the names of changed files, never a diff. Post on X copies the draft you like and opens X with it, for you to post; on Autopilot, Crux posts only what you schedule. It reads each post at 1 hour, 24 hours and 7 days, and learns which kinds of post work for your account only once a pattern beats chance.
More free tools
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- AI slop checker: Flags stock phrases, invented figures and links, length and long sentences in a draft.
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- Best time to post on 𝕏: Your readers' morning, lunch and evening, put on your clock. A guess, and it says so.
- 𝕏 engagement rate calculator: Interactions over impressions and over followers, for one post.
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- 𝕏 card validator: Reads a page's card and Open Graph tags and gives a tag to paste for each one missing.
- 𝕏 video spec checker: Checks a video's size, length, dimensions, aspect ratio and bitrate against 𝕏's limits, in the browser.
- 𝕏 advanced search builder: Turns plain fields or a preset into an 𝕏 search query and an x.com link.
- Reach linter: Flags a link in the main post, extra hashtags, engagement bait and AI-sounding phrases, with sources.