The cheapest way to edit PDFs in a browser depends on your volume. There is no single answer — but there is a clear hierarchy.
Here it is.
Free tiers
Flint Free, Sejda Free and Smallpdf Free all cover light editing without watermarks. Sejda's hourly cap is most generous. Flint covers light editing and signing comfortably.
Built-in tools first
Mac Preview, Edge PDF reader and ChromeOS viewer handle view-and-annotate free. Use these for the lightest tasks before any subscription.
Day pass
When free hits a wall, a Flint day pass is cheaper than any monthly subscription. Best for one-off heavy days.
Annual subscription
Only worth it when you use a PDF editor most working days. Flint Pro, Smallpdf, iLovePDF and Sejda all cluster around $7–9/month annual.
FAQ
What's the cheapest absolute?
Built-in OS tools — they are free and pre-installed.
What if free isn't enough?
Day pass before subscription.
Do free tools watermark?
Reputable ones (Flint, Smallpdf, Sejda, iLovePDF, PDF24) do not.
Stack built-in tools and Flint Free. Add day passes when needed. Subscribe only when you outgrow it.