Longest Sentence Finder

Rank sentences by word count to find run-on sentences and improve readability. Free, private and online — ideal for editors and students.

About this tool

Find Run-On Sentences Fast

Every sentence is ranked by its word count, so the long ones that tire readers are the first you see and can split.

How to use it

  1. Paste your text.
  2. Review sentences ranked by length.
  3. Split or shorten the longest ones.

Frequently asked questions

How long is too long?

Many style guides suggest an average around 15–20 words; sentences well over 30 words are good candidates for splitting.

Is my text uploaded anywhere?

No. The tool runs in your browser and the text never leaves your device, so you can paste confidential drafts, contracts or customer data.