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Real-time previews. No more guessing.

See exactly where every platform cuts your text.

See the fold. Stop guessing. Write once and watch your post render in native LinkedIn, X, TikTok, Threads, Instagram, and Facebook previews — with fold lines, thread splits, hashtag limits, and accessibility warnings live as you type, plus one-tap AI to improve your post on the spot.

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Live platform preview

LinkedIn

Hook zone preview

Safe hook line0 / 210 before fold

Your Name• 3rd

Founder & CEO

11h

Your post’s opening lines appear here…

1,200

89 comments17 reposts

LikeCommentRepostSend

Your whole post fits above LinkedIn’s Desktop fold — no "…see more" truncation.

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See how your post performs everywhere

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LinkedIn

3,000 limit

Hook survives

Add text to see what survives the fold.

X (Twitter)

280 limit

Hook survives

Add text to see what survives the fold.

Instagram

2,200 limit

Hook survives

Add text to see what survives the fold.

Facebook

63,206 limit

Hook survives

Add text to see what survives the fold.

Threads

500 limit

Hook survives

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TikTok

4,000 limit

Hook survives

Add text to see what survives the fold.

Advanced insightsWriting analysis, readability, keywords, and more

Readability

Flesch Reading Ease

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Reading Ease

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Grade Level

Keywords

Overuse monitor

Idle

Start typing to see your most-used keywords and their density.

See how it works in 3 simple steps

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Paste Your Text

Paste or type your content into the editor.
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We Analyze Instantly

We check character count, truncation points, and platform limits in real-time.
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Post With Confidence

See exactly how it will appear and post without worrying about cut-off text.

WHY POSTTRUNCATE?

Write with confidence.
Post without worries.

Every platform has different character limits and truncation rules. PostTruncate shows you exactly how your content will appear before you hit publish.

Save time, increase engagement, and make every character count with real-time previews, smart insights, and one-tap AI tone rewriting.

Real-time Previews

See exactly how your post will appear across 6+ platforms instantly.

Smart Insights

Get readability scores, keyword analysis, and content optimization tips.

Privacy First

Your content is never stored or shared. Everything stays private.

AI Tone Rewriter

Instantly rewrite your post in a professional, casual, friendly, or concise tone with one tap — powered by AI.

HOW TRUNCATION WORKS

See exactly how your post will appear

Each platform has unique character limits and display rules. When your content exceeds these limits, it gets truncated with "..." or "See more". PostTruncate simulates exactly how your post will appear after publishing.

Limits last verified: July 12, 2026

LinkedIn

Fold (mobile) ~140

Fold (desktop) ~210

X (Twitter)

No fold

Hard limit 280

Instagram

Fold (mobile) ~125

Fold (desktop) ~125

Facebook

Fold (mobile) ~125

Fold (desktop) ~480

Threads

Fold (mobile) ~250

Fold (desktop) 500

TikTok

Fold (mobile) ~100

Fold (desktop) ~100

WHO IS IT FOR?

Perfect for every content creator

Whether you’re growing a brand, managing clients, or building your audience, PostTruncate helps you write better and post with confidence.

Marketers

Optimize campaigns, ad copy, and social posts for maximum reach and engagement.

Drive more impact

Creators

Write better captions and threads that get more likes, shares, and saves.

Grow your audience

Agencies

Manage multiple clients and ensure every post is perfectly optimized.

Deliver consistent results

Founders

Share updates and build your brand with clear, impactful content.

Build trust & visibility

A character counter built for social media

PostTruncate is a free, browser-based character counter that works entirely on your device — no uploads, no accounts needed. Paste or type any text and you instantly see character count, word count, reading time, and letter distribution update as you write.

It’s built for anyone working with text under a limit: writers trimming an essay, marketers checking a headline, developers auditing a string. Because everything runs client-side, your drafts never leave your browser.

SMS encoding and segment counting

SMS has two encoding modes and most tools ignore the difference. PostTruncate detects automatically whether your message uses standard GSM-7 (160 characters per text) or Unicode (70 characters) — and the switch can happen the moment you type a single emoji or special character.

It also flags extended GSM characters — things like the Euro sign (€), square brackets, and the pipe symbol — which stay in GSM-7 mode but each consume two character slots instead of one. That hidden cost is why messages sometimes segment unexpectedly.

When your text spans multiple segments, the built-in segment calculator shows exactly how many texts your message will send, accounting for the User Data Header overhead that reduces per-segment limits to 153 characters (GSM) or 67 characters (Unicode).

SMS Character Counter

X (Twitter) limits and automatic thread splitting

X (Twitter) has two rules that catch people off guard: the 280-character limit, and the fact that every link — regardless of length — counts as exactly 23 characters. PostTruncate handles both, so the counter you see matches what X will actually report once the t.co wrapper is applied.

When your draft runs long, the built-in thread splitter breaks it into numbered posts at natural sentence boundaries — never mid-word. Each card shows its character count and position, so you can review the full split before you post.

X Thread Splitter & Character Counter

Instagram and Facebook character limits

Instagram caps captions at 2,200 characters, but only shows roughly the first 125 before hiding the rest behind a “more” link. PostTruncate tracks exactly where that cutoff falls so your opening line — the part visible in the feed — says what you actually need it to say.

The dashboard also monitors hashtag count in real time. Instagram allows up to 30 hashtags before a post fails to publish, but ~5 is the recommended sweet spot — more reads as spam — so the live meter warns past 5 and flags the 30 hard cap. Spaces are always counted, matching Instagram’s own behavior.

Instagram Caption Cutoff Previewer & Counter

Word count, readability, and platform analytics

Beyond platform limits, PostTruncate also counts words, sentences, paragraphs, and symbols — all updating live as you type. It’s useful for SEO meta descriptions, documentation reviews, or any writing workflow where you need more than a raw character tally.

The dashboard handles multilingual text correctly, including CJK scripts where character count carries different semantic weight. Whether you’re writing in English, German, Japanese, or Chinese, the counts reflect what the target platform will actually see.

AI-powered tone rewriting

The editor includes a built-in tone rewriter that adjusts the voice of your post without changing its meaning. Choose from five tones — professional, casual, marketing, friendly, or concise — and it rewrites your entire draft while preserving the original length and structure. It's a real AI model doing the rewriting, not a fixed template.

The rewriter locks every hashtag, @mention, URL, and emoji exactly where you placed them, so links and tags never get moved or dropped. It works on drafts up to 3,000 characters — longer posts (like an extended Facebook caption) won't be rewritten in full. It's free to use, with each visitor limited to 3 rewrites per 12 hours.

Writing the hook

The first line is the only line most people read.

On every feed, the text above the fold does all the work. Open with a result, a tension, or a question — not a warm-up. Move links and hashtags below the fold, keep your opening under the platform’s cut-off, and let the preview confirm the hook survives before you publish.

FAQ

What is post truncation?

Truncation is what happens when a platform cuts your post short — either hiding everything past a visual fold behind a "…see more" link, or rejecting characters beyond a hard limit. PostTruncate shows you exactly where each platform makes that cut, live, while you write, so the part that matters never disappears below the fold.

Why do social media platforms truncate posts?

Feeds are built for scanning, so platforms collapse long posts to keep scrolling fast and fit more posts on screen. Each platform draws the line differently: LinkedIn folds at roughly 140–210 characters, Facebook at about 110–480 depending on device, Instagram at around 125, and X simply enforces a hard 280-character cap. Anything past the fold is only seen by people who actively tap "more" — which most readers never do.

Which platforms does PostTruncate support?

PostTruncate previews LinkedIn, X (Twitter), TikTok, Threads, Instagram, Facebook, and SMS — with live character counts, fold markers, thread splitting, and SMS segment math for each. There is also a Google SERP preview for page titles and meta descriptions, and a free embeddable counter widget for your own site.

How accurate are the character limits?

PostTruncate counts against each platform’s published and widely-observed limits — 280 for X, 210/140 for the LinkedIn fold, a recommended ~5 hashtags (30 hard cap) for Instagram, and a flat 23-character weight for links. Platforms occasionally adjust these, and rendering varies slightly by device, so treat the previews as a close estimate rather than a pixel-perfect guarantee.

How do emojis affect the character count?

PostTruncate counts by Unicode code points, so a simple emoji like 🙂 registers as one character. Many emoji are built from several joined code points — skin-tone variations, flags, and combined glyphs such as 👨‍👩‍👧 — and those register as two or more. The tool handles any script correctly, including CJK characters. Most platforms, X especially, also weight emoji more heavily than plain letters, so an emoji-heavy draft uses up a little more of your limit than the visible glyph count suggests.

Is my text sent anywhere?

No. The entire editor and every preview run locally in your browser — nothing is uploaded. Your text never leaves your device: there’s no account, no upload, and no server processing of your content.

Is PostTruncate free?

Yes, completely free to use with no sign-up required and nothing to install. The tool is supported by unobtrusive ads placed in reserved spaces that never shift the layout while you’re working.

Why did my 160-character SMS suddenly count as two messages?

This happens because of a change in your text's encoding. Standard SMS uses GSM 7-bit encoding, which fits up to 160 characters in a single message. The moment your text includes a non-GSM character — an emoji, a regional script, or certain symbols — the entire message switches to Unicode, which holds only 70 characters per segment. If a Unicode message exceeds 70 characters, a multi-part header is added and the usable space per segment drops to 67 characters. PostTruncate shows your current encoding and segment count live, so you always know where the break happens.

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