Twitter / X Header Resizer — Free Online

Start with the message of the banner rather than trying to squeeze an entire poster into it. A simple scene, broad texture or concise piece of existing artwork can remain recognizable at a small display size. A portrait photograph may lose the top and bottom when filling the header; inspect the preview for a cut-off head or a partially visible product.

Leave room around the details that matter. The profile photograph and responsive layout can affect how the header appears after publication. This tool does not draw a guaranteed safe zone because the account interface is outside the exported image. Test the actual profile on a phone and a wider screen, especially if the source contains text near the corners.

X provides its header dimensions in profile customization guidance. For another professional banner shape, LinkedIn Banner Resizer creates a separate copy rather than stretching this one. A format change can be handled by Image to JPG. Keep the original design and upload the downloaded header yourself; resizing does not modify your biography, profile photograph or visibility settings.

Open one image and check the width and height before processing. Selecting a preset fills both fields; you can replace those values with custom pixel dimensions. The default fit fills the canvas with a centered crop. When the shapes differ, the fit controls let you keep the whole picture with padding instead, or deliberately stretch it. Padding is white for JPEG and can be transparent for PNG or WebP. The aspect lock controls dimension edits; it does not protect an off-center subject from a crop.

The resizer accepts JPG, JPEG, PNG, WebP, HEIC and AVIF. HEIC needs its browser decoder, downloaded when first required; AVIF support depends on the browser. JPEG, PNG and WebP retain their format, while HEIC is exported as JPEG and AVIF as PNG. If the destination needs another format, use Image to JPG or the corresponding converter. A correct filename extension alone does not mean that a file has been converted. This page resizes a still image, not a video or an animated sequence.

Review the downloaded copy at its intended display size as well as at full resolution. Enlarging a small source creates more pixels but cannot restore missing detail. Resizing sets pixel dimensions, not a guaranteed maximum in KB; Reduce Image Size handles a file budget afterward. Keep the original for another attempt, since repeatedly saving a JPEG can accumulate visible damage. The tool processes files locally without signup and does not publish to another service. On mobile, keep the tab open until the result is ready, then confirm that the saved file is the newly generated copy.