Liner

• AI search with line-by-line citations

• Scholar mode (restrict answers to academic/peer-reviewed sources)

• Deep Research (in-depth exploration with reasoning)

• Smart summarization of articles, PDFs, and videos

• Upload and query documents (PDF/text)

• Multi-format response styles and follow-up question support

• Browser extension / AI copilot for web, YouTube & PDF

• Highlighting, bookmarking, and organizing research snippets

• Multi-device syncing (web, mobile, desktop)

• Export citations in common styles (APA, MLA, etc.)

Liner is an AI-powered research and search engine designed for students, scholars, and professionals who demand credible, scholarship-focused answers backed by verifiable sources. Rather than relying on opaque generative responses, Liner returns answers with line-by-line citations, so users can see exactly where each fact comes from and verify claims independently. The platform is optimized for academic research, literature review, and knowledge discovery, ensuring that responses are rooted in trustworthy sources.

At its core, Liner offers a “Scholar mode” which restricts output to peer-reviewed, academic, or otherwise credible publications. This helps avoid misinformation or low-quality content. For deeper investigations, the “Deep Research” feature uses multi-agent reasoning to break down questions, explore subtopics, and present structured insight along with source trails.

Users can upload documents (like PDFs) and query them directly, enabling Liner to read, summarize, and answer questions about their text. It also supports summarization of web pages, YouTube videos, or long articles with key takeaways and highlights. Through its browser extension or AI copilot, users can highlight passages anywhere on the web and immediately ask questions in context.

Liner allows saving and organizing highlights, snippets, and citations, synchronizing across devices for continuity. It supports export of citations into popular styles (APA, MLA, Chicago) to streamline academic or professional work.

Because trust is central to Liner’s mission, every statement is traceable, and reasoning paths are exposed so users can follow how conclusions were drawn. This differentiates it from generic generative AI search tools.

With users numbering in the millions, Liner has gained traction in educational, research, and professional circles. It offers both free and paid plans, enabling wider access while unlocking advanced features for power users. Whether you are writing a paper, preparing a report, or investigating a complex topic, Liner helps you move from question to credible insight faster and more transparently than traditional search methods.