I like Lumin’s speed and simplicity. Large spec PDFs open fast in the browser, and the annotation tools are intuitive. I can keep comments tied to the exact section, share a document so reviewers can comment together, and edit files where they already live with Google Drive. Drive sync means no manual uploads or version confusion. I also find merge, split, and compress useful for bundling documents, and e-signatures make signing NDAs and vendor agreements quick without printing or using a separate tool. Lumin cuts out the back-and-forth of downloading, editing, and re-emailing PDFs, and keeps comments in one shared file instead of scattered across Slack and email. Since it runs in the browser, the team can use it across Linux, Mac, and Windows without a heavy desktop editor or extra licenses. It was easy to set up: we signed in with Google, connected Drive, and were productive the same day. Adding members was simple, and the interface was intuitive enough that nobody needed formal training. It’s an affordable tool and great value for dev teams that review and sign documents daily. Review collected by and hosted on G2.com.

Editing existing text in complex PDFs can shift the formatting, and very large files with lots of diagrams sometimes lag. Offline support is limited. I’d also like a public API or webhooks to automate PDF generation and signing from our apps and CI pipelines, plus Jira and Confluence integration and finer-grained team permissions. Review collected by and hosted on G2.com.