Built a free PDF tools site after getting tired of daily caps — notes on what most "free" services quietly limit
I've been building a free PDF tools site (pdfgrover.com) for the last few months and went down a rabbit hole comparing the actual limits on every "free"
PDF tool I could find. Wanted to share the surprising bits.
Most "free" PDF tools cap quietly. The exact numbers move around between sites and they change them often, but the pattern is consistent: small per-file
size caps, a low daily operation count, or a watermark on the output unless you upgrade. The headline says "free", the day-to-day reality tends to be
"free up to roughly 1-2 documents per session before something gets in the way".
I shipped my own deliberately more generous — bigger merges, bigger conversions, no watermarks, no signup. The biggest learning so far is that the tight
caps on most competing sites aren't there because the operations don't scale technically. They're there because uncapped free users hurt per-user
economics on a freemium model. If you're not trying to convert free users to paid, you can afford to be more generous out of the box.
A few things I picked up along the way:
- Smaller PDFs can run entirely in the browser, so they never hit a server at all. Most of the big "free" sites still upload everything because their
conversion pipelines are server-only — that's part of why they need to cap.
The genuinely expensive operations are the ones that have to run on a server. Anything that runs in the browser is essentially free to host.
You can keep the size caps reasonable on the operations that matter most (merge, compress, sign) and still stay sustainable, as long as you're not
paying a per-document fee somewhere in the pipeline.
What's still hard / limited on the site:
- True per-page redaction is content removal, not just visual hiding. It's harder to build than people think and most "redact" tools online don't actually do it.
Honest pitch: free, no signup, no watermarks, no daily caps. Happy to hear feedback if anything feels off.
pdfgrover
