Bluesky Banner Size & Crop Tool

What is the right bluesky banner size?

The widely used working size for a Bluesky profile banner is 3000 × 1000 pixels — a 3:1 ratio. That is a community convention, not a hard platform rule: Bluesky publishes no official pixel spec for banners, and different clients may crop banners slightly differently. The practical bluesky banner size answer is therefore simple: work at 3000×1000, keep the important content near the center, and your banner will look right everywhere.

If your source photo is small or your bandwidth is limited, 1500 × 500 pixels — the same 3:1 ratio at half the size — is a perfectly good bluesky banner size. Bluesky accepts both; the profile header scales the image to fit its container, so the ratio matters far more than the absolute pixel count.

How the bluesky banner size tool works

The tool fixes a 3:1 crop window over your image and lets you slide and zoom it until the framing is right. A live preview shows exactly what will be exported — the bluesky banner size frame never distorts your image, it only chooses which slice becomes the banner.

When you press download, the tool draws that slice onto an off-screen canvas at full output resolution and hands you the file. Decoding, cropping and encoding all happen locally via the Canvas API and toBlob(); there is no upload, no queue, and no format conversion server.

Safe area and mobile cropping

Desktop clients show the full 3:1 banner, but phones crop banners vertically — often keeping roughly the middle two-thirds. That is why the bluesky banner size tool offers a safe-area overlay: the dashed rectangle marks the zone that stays visible on narrow screens.

The rule of thumb that follows: keep logos, wordmarks and faces near the horizontal center and away from the top and bottom edges. A bluesky banner size export composed this way survives aggressive cropping with its message intact — the edges become decoration, not information.

PNG or JPG for your bluesky banner size?

Both formats work on Bluesky. PNG is lossless and handles flat colors, text and sharp edges best — usually the right choice for a designed banner. JPG compresses photographic content far better at 92% quality and produces a much smaller file for the same 3000×1000 bluesky banner size; the tool fills transparency with white before encoding, since JPG has no alpha channel.

As a rough guide, a photographic 3000×1000 JPG lands around 300–800 KB, while the same PNG can run several megabytes. If your banner is mostly text and geometric shapes, take the PNG; if it is a photo, the JPG from this bluesky banner size tool is visually identical and uploads faster.

How to change your Bluesky banner

Once your bluesky banner size export is downloaded, applying it takes under a minute on any device.

• Open bsky.app and sign in, then open Settings → My Profile (or click Edit Profile).
• Click the camera icon on the wide banner area at the top of your profile.
• Select the file you exported — e.g. bluesky-banner-3000x1000.png.
• Drag to reposition if the app offers a final crop, then save.
• Reload your profile: the new banner is live immediately.