'Which is faster' is a real question for daily PDF users. Seconds add up when you do the same job ten times a week.
Here is the honest speed comparison of Smallpdf and Flint on common tasks.
Editing text
Flint feels faster on text-editing. The editor opens in a single page load and inline edits commit without round-trips. Smallpdf re-renders more often. For edit-pdf tasks, Flint wins.
Merging and splitting
Comparable. Both pre-flight files in browser then process server-side. Smallpdf's drag-and-drop ordering is slightly more polished; Flint's merge-pdf is a touch faster on large stacks.
Converting
Smallpdf is the long-running benchmark on Word conversion. Flint's convert-pdf-to-word is competitive on modern documents. On heavily-formatted templates, Smallpdf still has the edge by a hair.
Signing
Flint wins clearly on sign-pdf. Fewer clicks, faster placement, saved signature loads instantly. Smallpdf's signing flow is fine but more spread across screens.
Best for…
Flint for editing and signing speed. Smallpdf for the most polished conversion. Both are within seconds of each other on most jobs.
FAQ
Does file size affect speed?
Yes — both slow on huge files. Compress first via compress-pdf before heavy operations.
Does internet speed matter?
Yes — both upload files. Faster connection, faster total time.
Which is faster on mobile?
Flint feels quicker in mobile browsers; Smallpdf has a polished native app that is fast in its own right.
If you live in editing and signing, Flint feels faster. If conversion is your daily job, both are close.