Create properly sized images for Twitter/X posts at 1200x675 with text overlays.
An X post image has to arrive at 1200x675 pixels, a 16:9 frame, or the platform crops and scales it in the timeline. This tool builds the file at that exact size: you type a headline and supporting copy, and it renders a 1200x675 PNG with your text overlaid, laid out to stay inside the frame. Everything runs in the browser, so the text you paste is never uploaded anywhere. The surprise most people hit first is that the canvas does not grow for long copy; the overlay is fitted to the fixed frame, so a short headline renders much larger than a long one.
A concrete input and expected output from the current implementation.
Input
Launching Atlas 2.0 on Friday. Free for all accounts created before June 1.
Expected output
A 1200x675 pixel PNG at exactly 16:9 (1200 and 675 both divide by 75: 16 x 75 = 1200, 9 x 75 = 675), with "Launching Atlas 2.0 on Friday." as the headline and "Free for all accounts created before June 1." beneath it, both scaled and wrapped to fit inside the frame with the full text visible.
The canvas is the entire point: at 1200x675 the file matches the 16:9 frame X displays in-stream images in, so the platform has nothing to crop or rescale. The arithmetic checks out twice: 1200 / 75 = 16 and 675 / 75 = 9, so the ratio is exactly 16:9, not a rounded approximation.
The tool starts from a 1200x675 canvas and never changes it. Your headline and supporting text are drawn on top as an overlay, and the export is a PNG at those exact dimensions, so the layout you see in the editor is the file X receives. Because 1200 and 675 divide by 75, the frame is exactly 16:9 - the ratio the timeline displays single images at.
Overlay copy is wrapped and scaled to fit the fixed canvas; the frame never expands for long input. Text is reflowed at word boundaries and the type size steps down until the whole block fits, which is why a two-word headline reads as a poster and a full paragraph renders small. That fitted layout is what exports, so what looks cramped in the editor is exactly what posts.
No, it is the recommended size for in-stream post images, and the tool is built around it. X accepts other dimensions, but anything that is not 16:9 gets cropped or scaled in the timeline, which is exactly what this tool prevents. Profile headers, banners, and link-preview cards use different sizes.
The output is a plain image: the overlay text is not searchable and is not read aloud by screen readers, and no setting in the tool changes that. Keep the key line in the caption too, so the message survives for anyone using assistive technology or viewing with images disabled.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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