CombinePDF vs LightPDF

CombinePDF creates one downloadable PDF from uploaded PDF files and images. It accepts PDF, JPG, JPEG, PNG, and BMP files, and lets users arrange the upload order before producing the result. Image pages and PDF pages can be mixed, while JPG, JPEG, and PNG collections can be compiled into a PDF. The service is free to use without registration or an email address and says it adds no watermark. Uploads are limited to 20 files at once, with each file up to 120 MB. Uploaded files and generated PDFs are deleted when the user leaves the page; its privacy policy says files are held temporarily during processing rather than permanently. Transfers use HTTPS. The service collects usage data such as browser type, access times, and pages viewed, and uses cookies for preferences and site analysis. It runs on web, Android, iOS, Linux, macOS, and Windows.

LightPDF is an AI-powered PDF service for editing, converting, annotating, signing, organizing, and chatting with documents. Its AI Agent accepts chat requests for tasks such as merging, conversion, watermark removal, page numbering, and compression. Other listed AI features include translation, image processing, data extraction, invoice generation, and document enhancement. LightPDF offers a conversion API for PDFs and office documents, including Word, Excel, PowerPoint, images, HTML, and text. It is available on the web, Android, iOS, macOS, and Windows, with a Chrome/Edge extension. The free plan is web-only, limits files to 10MB, includes five cloud files for one year, and allows three AI Agent questions per day. Monthly and yearly plans include 1,000 AI credits per month; the lifetime plan includes 40,000 credits valid until used. Monthly costs $5.99 a month, Yearly costs $15.99 a year and includes a 3-day free trial, and Lifetime costs $39.99 a month. Premium features can be used on one device at a time.