Smallpdf is a Swiss-based document tool company that launched in 2013 and has grown into one of the largest PDF tool platforms on the web, with a free tier (with daily limits), paid Pro and Team plans, native desktop and mobile apps, and a recent round of AI features built on top of the core PDF tools.
meraSaaS is a small bundle of 26 utility tools across categories: PDFs, photos, business documents, calculators, and a couple of utilities. It is not trying to compete with Smallpdf's depth on the PDF side. It is offering a different shape: more tool categories, fewer tools per category, browser-side processing for every tool, and no paywall. Every tool is free with no sign-up. An optional Pro plan ($7/month) only adds a larger place to save your work.
If you already pay for Smallpdf and use it daily, this comparison is probably academic for you. If you are looking at meraSaaS as a possible alternative or replacement, here is what is actually different.