What does TL;DR mean?
'Too long; didn't read': either a dismissive response to a long text or a label introducing its short summary.
Also written: TLDR · too long didn't read
The meaning
TL;DR has two common jobs. As a stand-alone reply, it says the writer did not read something because it was too long. At the start of a short paragraph, 'TL;DR:' instead means 'here is the condensed version.' The punctuation and position help distinguish the complaint from the helpful summary.
What’s the tone?
A bare reply can sound impatient or rude. A summary label is usually practical and reader-friendly.
When and how to use it
For a useful TL;DR, state the main conclusion and necessary action in one or two sentences. When someone asks for a TL;DR, provide the gist if you can. In a sensitive discussion, dismissing a person's whole message with the acronym may close the conversation.
In a conversation
Original examples to illustrate the expression.
TL;DR: Friday's workshop has moved online; the time stays the same.
Thanks. I'll use the meeting link instead of going to the venue.
Easy to misread
TLDR and TL;DR are spelling variants with the same core meanings. A labeled summary does not imply that its author skipped the full text. Shortening a message should still preserve conditions that affect the conclusion.
A little context
Merriam-Webster records both the dismissive and summary uses, and Slang.net explains their role in forums and social posts. This shorthand predates today's short-video culture; its dictionary coverage does not establish a recent trend.
Sources & further reading
These sources support the explanation. The dialogue above is original.
- TL;DR definitionMerriam-Webster · Checked Oct 9, 2026
Records too long; didn't read and the use introducing a concise summary.
- TLDR: meaning and usageSlang.net · Checked Oct 9, 2026
Explains the non-reading reply, helpful summary sections and punctuation variants.
Prepared with AI assistance and automated quality checks. Meanings can vary by context. Read our editorial policy.