Bluesky post previewer
A Bluesky post previewer draws your post as the app does: the display name and the domain handle, your text, the image grid, and the reply, repost and like row. Bluesky’s limit is 300 and it is counted in bytes, so the previewer counts it that way too.
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300, in bytes, per post in a thread
Bluesky allows 300 and counts UTF-8 bytes, so emoji cost four each and non-Latin letters cost two. The useful part is that a thread gives every post its own 300, so the answer to a long idea on Bluesky is more posts rather than fewer words.
Images are capped at four per post, and each one has a size ceiling of about 1 MB, which is low. A photo straight off a phone is usually several times that, so it has to be compressed on the way in.
The handle is a domain, and it takes up room
A Bluesky handle is a domain name, so it is long and it cannot be broken across lines. Together with a display name it makes the header the widest single row in the card, which is why a Bluesky post squeezed into a narrow column truncates the name before anything else.
The image grid behaves like X’s: one image keeps its shape, two or more go into tiles that crop from the centre. A single video is letterboxed inside a black canvas rather than left-aligned, so a vertical clip gets bands either side instead of sitting off to one edge.
Before you publish
- Count four bytes per emoji against the 300.
- Split long thoughts into a thread. Each post gets its own 300 bytes.
- Compress images before uploading. The per image ceiling is around 1 MB.
- Four images maximum, and anything beyond the first is cropped into a tile.
Preview a post for another platform
X (Twitter) post previewerAn X post previewer shows the tweet as a timeline renders it: your text at the real width, the photo grid X builds from your images, and the engagement row underneath.Open it
Instagram post previewerAn Instagram post previewer shows you the post Instagram will actually render, not the one you typed.Open it
Facebook post previewerA Facebook post previewer renders your post the way a Page timeline will: your text above the media, the album grid Facebook builds from however many photos you attached, and the Reel or Story canvas with Facebook’s own overlays on top..Open it
LinkedIn post previewerA LinkedIn post previewer renders your post as a feed will: your text with the "see more" fold in it, your image inside LinkedIn’s own canvas, and the reaction and comment row underneath.Open it
YouTube post previewerA YouTube post previewer shows the two things a viewer sees before they watch anything: the thumbnail with your title beside it, and the Short with YouTube’s interface over the top.Open it
TikTok post previewerA TikTok post previewer puts your video or your photos behind the real TikTok interface: the caption at the bottom left, the action rail down the right, the sound ticker, and the dots if you are posting a photo carousel.Open it
Threads post previewerA Threads post previewer renders your post the way the Threads app does: the username line, your text, the media carousel, and the like and reply row underneath.Open itSocial media safe zone checkerA safe zone is the part of a full screen vertical post that the app’s own interface does not cover.Open itInstagram Reels safe zone checkerThe Instagram Reels safe zone is the part of a 1080x1920 frame that Instagram’s interface does not sit on.Open itOr preview every platform at once with the full post previewer.
This tool is free, forever. No accounts, no paywalls, no catch.
I build these solo. If you want to support my work, donating a coffee would be highly appreciated! ☕
Frequently Asked Questions
Everything you need to know about Bluesky post previewer from PublishQ
No credit card required • Set up in under 3 minutes
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— me 👋
Hi, I'm Alexandro 👋
I left my Software Engineer role at Amazon to build tools that solve real problems — the kind big companies ignore because they read spreadsheets instead of using their own products.
I was spending over an hour daily just scheduling 2 shorts across 3 platforms — logging in, reformatting, uploading one by one. That felt broken. So I built PublishQ . Now I create 4 shorts in 3 minutes and schedule them to 4 platforms in under 30 seconds.
PublishQ is bootstrapped. No investors, no vanity metrics. I build what actually helps you — because I use it every day myself.
Thank you,
Alexandro
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