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LightPDF
lightpdf.com · scored Apr 2026GPT-4 chats with PDFs, but the file limit is 20MB.
Best forStudents, educators, and remote teams needing affordable multi-platform PDF tools.
AI-powered PDF suite with GPT-4 document chat, OCR, and 25+ editing tools across devices.
The thing people get wrong
Paid plans have no file size limits
Some users hit a 20MB upload limit right after subscribing, despite being told there were none
Source: aidetectplus.com
Upside
- GPT-4 document chat with citations
- 25+ tools across web, desktop, mobile
- Clean, Adobe-like interface
Catch
- 20MB file limit surprises paying users
- AI credits expire monthly if unused
- OCR struggles with complex layouts
Editor's takeLightPDF's strongest score comes from its AI features, using GPT-4 to let users chat with a PDF and get answers with automatic page citations, on top of a 25-tool suite for editing, converting, and OCR across web, desktop, and mobile. Reviewers compare its interface favorably to Adobe Acrobat. The catch is value: some users report hitting an undisclosed 20MB upload limit right after subscribing, and unused AI credits expire monthly.
How much does LightPDF cost?
Plans start around $29.99 a month, with a limited free tier available. Some users report AI credits expire monthly if unused, and a 20MB file size limit applies even on paid plans, according to a review on aidetectplus.com.
Can LightPDF answer questions about a PDF's content?
Yes. Its GPT-4-powered chat feature lets users ask natural language questions and get answers with automatic page citations, plus AI-generated mind maps and presentations.
The evidence: 6 criteria, 1 penalty (−0.05 points)
Score adjustments−0.05 points in total










