TL;DR.
“Too long; didn’t read.” It can dismiss a long message, but is also a common label for a short summary supplied by the writer.
What does TL;DR mean?
TL;DR has two common functions. As a reply to someone else’s long post, it can say the reader did not read it, often sounding dismissive. As a heading written by the author, it introduces the main point for readers who need a quick version.
The summary use can be helpful rather than rude: a report may start with “TL;DR: we need another week.” The punctuation varies, and TLDR without the semicolon usually means the same thing. A good summary preserves the important qualifications instead of making a more dramatic claim than the full text supports.
See how it lands.
Original examples written for this entry, not quotations from the sources.
TL;DR: the event is still happening, but it starts an hour later.
After her detailed explanation, he replied only “tl;dr.”
The right word.
The right moment.
Use it to provide a helpful short version of your own material. In a formal setting, summary or key points may be a better label.
Avoid replying with only TL;DR when someone needs a thoughtful answer. If you need a shorter explanation, ask for one directly.
Not quite the same as…
an executive summary
Both condense material, but executive summary is a formal label. TL;DR retains a casual internet register.
A little backstory.
The initials abbreviate too long; did not read and come from online discussion culture. Their later use as a summary heading changes the social function without changing the expansion.
Supported by Wiktionary contributors
Still wondering?
Is TL;DR rude?
As a bare reply it can be. As a helpful summary heading in your own post, usually not.
Does TLDR without a semicolon mean the same thing?
Usually yes. The punctuation varies across platforms and typing styles.
Sources & checks
Meaning and factual notes are informed by the references below. Examples and usage advice are original editorial writing. A source documents use; it does not measure current popularity.
- tl;dr — English entry ↗Wiktionary contributors · checked 19 Oct 2026Supports: meaning; usage