How Long Should a LinkedIn InMail Be?
Keep a first LinkedIn message under 500 characters, and aim for about 175. Across 10,877 openers we sent, the median was 176 characters, messages under 500 characters were replied to 39.1% of the time, and messages of 500 characters or more were replied to 21.9% of the time. That is a 17.2 point penalty for writing a long first message.
Last updated: September 2026 · Next update: December 2026 · Methodology
The four numbers that settle the question
Median opener length
176 chars
Computed. 10,877 first messages, p25 113, p75 282
Reply rate under 500 chars
39.1%
Computed. 9,179 messages
Reply rate at 500 chars and up
21.9%
Computed. 1,698 messages
Cost of going long
17.2 pts
Computed. The gap between those two bands
Computed: reply rate by opener length
| Opener length | Reply rate |
|---|---|
| 1–49 characters | 42.5% |
| 50–99 characters | 28.1% |
| 100–199 characters | 40.2% |
| 200–299 characters | 40.9% |
| 300–499 characters | 40.2% |
| 500–799 characters | 20.8% |
| 800–1,199 characters | 19.8% |
| 1,200+ characters | 28.7% |
10,877 outbound openers that carried text. Length is the character count of the first message we sent in a conversation. Reply rate: conversations in which the other person sent at least one message afterwards, divided by conversations in that band. The 1,200+ row comes from 5 sending accounts, below our floor of 8, and is published with that floor stated rather than dropped, because removing it would hide the shape of the tail.
Computed: the same cut inside each sending account
| Opener length | Accounts | Median account reply rate |
|---|---|---|
| Under 500 characters | 17 | 41.6% |
| 500 characters and up | 6 | 22.0% |
Each account contributes its own reply rate first, then the median is taken across accounts, so one heavy sender cannot speak for the market. Only accounts with at least 25 openers in a band are counted, which is why the long band covers 6 accounts and sits below our usual floor of 8. The pooled column repeats the whole-cohort figure for comparison. Both methods give the same answer, which is the point of running it twice.
Compiled: length target by message type
| Message | Target length |
|---|---|
| Cold opener to a stranger | 120–250 chars |
| Opener after they engaged with your post | 80–180 chars |
| Connection request note | 1–2 sentences |
| First follow-up | Under 200 chars |
| Reply once they answer | Match their length |
| Proposal or long context | After a reply, not before |
Compiled guidance. Our data measures the character count of the message and whether a reply followed, not what the message said.
How to cut a LinkedIn opener down to size
- 1
Delete the introduction
Your name and company sit on your profile. The first line should be about them, not about you. That alone removes 60 to 100 characters from most drafts.
- 2
Keep one specific reference
One named post, one number, one shared detail. Two references read as research, three read as a template that fills in blanks.
- 3
Cut every sentence that explains the previous one
Long openers are usually one idea written twice. Delete the second version.
- 4
Ask one question and stop
Two questions halve the chance either gets answered. End on the easiest one.
- 5
Count the characters before sending
Under 500 is the line the data draws, and around 175 is where the median reply came from. If the draft is over 500, the detail belongs in the next message.
Frequently asked questions
How long should a LinkedIn InMail be?
Under 500 characters, and around 175 is where most replies come from. Across 10,877 first messages we sent, the median was 176 characters, messages under 500 characters got a reply 39.1% of the time and messages of 500 or more got 21.9%. The same gap holds inside each sending account: 41.6% against 22.0%.
How many characters should a LinkedIn message be?
Between 100 and 300 characters for a cold opener. Our computed bands sit at 40.2% for 100–199 characters, 40.9% for 200–299 and 40.2% for 300–499, so anything inside that range performs about the same. The collapse starts at 500 characters, where the rate drops to 20.8%.
Do shorter LinkedIn messages get more replies?
Up to a point. Everything under 500 characters performs about the same, between 40% and 42.5%. Below that the length itself stops mattering and the content takes over. Above 500 characters the reply rate roughly halves, to 20.8% at 500–799 characters and 19.8% at 800–1,199.
Is a one-line LinkedIn message too short?
No. Openers of 1 to 49 characters were replied to 42.5% of the time across 1,257 messages, the highest band in our data. A short question is easy to answer, which is most of what a first message needs to be.
Why did messages between 50 and 99 characters do worse?
They dropped to 28.1% across 1,204 messages, against 42.5% just below and 40.2% just above. That band is where generic greetings live, the ones that are long enough to look like a template and short enough to carry no specific reference. The dip is about content rather than length.
Does message length matter more than what the message says?
Length is the cheapest thing to fix and it is worth 17.2 points on its own. It is not the largest factor. A message under 500 characters with no specific reference to the reader still fails. Treat 500 characters as a ceiling, then spend the effort on the reference.
Methodology
Computed on 2026-09-09 across 10,877 outbound LinkedIn openers that carried text, drawn from the 10,922 conversations in which our side sent the first message. 45 openers were attachment-only and are excluded.
Length is the character count of the first message we sent in a conversation, before any follow-up.
Reply rate. Numerator: conversations in which the other person sent at least one message after that opener. Denominator: conversations in the length band.
The within-account table computes each account's own reply rate per band, then reports the median across accounts. Accounts need at least 25 openers in a band to be counted, so the 500-plus row rests on 6 accounts and states that floor on the page.
The 1,200+ band comes from 5 sending accounts and is published with its account count visible rather than dropped, because the shape of the tail is the point of the table. No other row falls below 10 accounts.
This is an association measured inside real outreach, not a randomized test. Long openers were also sent by fewer accounts and to different lists, which is why the within-account control is published alongside the pooled figure.
Compiled length targets are guidance. Our data records how long each message was and whether a reply followed, not what it said.
Computed figures from Creator's anonymized LinkedIn DM dataset. Supporting research: LinkedIn Sales Solutions messaging guidance and the message-length lever published on our InMail response rate benchmarks page.
Understand the terms
Opener
The first message you send in a conversation.
InMail
Paid LinkedIn message format for messaging non-connections.
DM Reply Rate
Conversations you started that got a reply, divided by conversations you started.
Within-Account Method
Each account contributes its own rate first, then the median is taken across accounts.
Value-First Message
Opener that delivers an insight before asking for anything.
Template Fatigue
The drop in replies once a message pattern is recognised.
LinkedIn Content Playbook
A short opener works because the reader already knows who you are.
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