PostDecks
PostDecks

Preview your post on every platform, then get client sign-off with a link or a PDF.

Save a client's name, handle, and logo to reuse later. Stored on this device only.

@
X (Twitter): 185/280LinkedIn: 185/3,000LinkedIn Carousel: 185/3,000Instagram: 185/2,200Facebook: 185/63,206
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X (Twitter)1600 × 900
Plume@plumeapp·1h

Today we're launching Plume 2.0. Scheduling, analytics, and approvals now live in one place, so client work stops living in spreadsheets. Early access is open now, link in the comments.

53
28
412
14K
LinkedIn1200 × 627
Plume
9,240 followers
5h·

Today we're launching Plume 2.0. Scheduling, analytics, and approvals now live in one place, so client work stops living in spreadsheets. Early…more

412
53 comments · 28 reposts
LinkedIn Carousel1080 × 1080
Plume
9,240 followers
5h·

Today we're launching Plume 2.0. Scheduling, analytics, and approvals now live in one place, so client work stops living in spreadsheets. Early…more

412
53 comments · 28 reposts
Instagram1080 × 1440
plumeapp
412 likes
plumeapp Today we're launching Plume 2.0. Scheduling, analytics, and approvals now live in one place, so client work stops living in… more
View all 53 comments
2 hours ago
Instagram Story1080 × 1920 · 9:16same on both
plumeapp2h
Send message
Facebook1200 × 630
Plume
5h·

Today we're launching Plume 2.0. Scheduling, analytics, and approvals now live in one place, so client work stops living in spreadsheets. Early access is open now, link in the comments.

412
53 comments · 28 shares

Preview every platform. Get client sign-off.

PostDecks is a free tool for the people who run social accounts for clients. Paste a caption, drop in an image, and see exactly how the post will look on X, LinkedIn, Instagram, Facebook and the rest, before it goes anywhere near a client. Then send a link they can approve, or export a PDF proof for sign-off. No dashboard for your client to log in to.

Why the same post looks different

One caption and one set of images can look completely different from platform to platform. Three things decide how it renders:

Image ratios

Instagram defaults to 3:4 portrait, Facebook and LinkedIn prefer 1.91:1 landscape, X shows 16:9, and Stories fill a full 9:16. Upload one image and every platform crops it differently.

Caption cut-offs

Every platform cuts long captions at a different point. Instagram hides everything past about 125 characters behind a more link, LinkedIn around 210, and Facebook around 477. X shows the whole post but caps a standard account at 280 characters, with more on Premium. PostDecks applies each platform's rule as you type.

Galleries

Instagram builds a swipeable carousel. Facebook and LinkedIn arrange orientation-aware collages. X uses fixed templates. The same set of images renders a different layout everywhere.

How it works

  1. 01

    Upload and compose

    Drag in your images, paste the caption, and set the display name, handle, and LinkedIn headline. Every preview updates live.

  2. 02

    Review every format

    Switch light and dark, change aspect ratios, and filter down to the platforms you are posting to.

  3. 03

    Export and share

    Download one combined PDF proof sheet, or individual PNGs per platform, then send it for sign-off.

Platform specifications

The exact ratios, limits, and truncation points PostDecks renders against.

PlatformRatioLimitTruncation
X (Twitter)16:9280 charsNo truncation
LinkedIn1.91:13,000 chars~210 chars
LinkedIn Carousel1:13,000 chars~210 chars
Instagram3:42,200 chars~125 chars
Instagram Story9:16n/aNo caption
Facebook1.91:163,206 chars~477 chars
Facebook Story9:16n/aNo caption
Threads1:1500 charsNo truncation
Bluesky16:9300 charsNo truncation
Pinterest2:3500 charsNo truncation
TikTok9:164,000 chars~100 chars

Your content stays private

Everything runs in your browser. When you upload an image it is processed locally and never sent to a server. No account, no upload, no storage. Close the tab and the images are gone.

That matters when you are working with unreleased campaign assets. Your client's images and copy stay on your machine through preview and export. Nothing is logged, retained, or visible to anyone but you.

Your images and captions are never uploaded, so there is nothing for anyone to track. Visit counts come from Vercel Web Analytics, which is cookieless. If you arrive from one of our ads we may measure that, and in the UK and EU we ask first. Full detail in the privacy policy.