Adobe Acrobat Online is the browser-based slice of Acrobat. Flint is a browser-first PDF editor with no desktop sibling. The two go head to head on the same turf.
Here is the honest comparison.
Free tiers
Acrobat Online lets you do a small number of free tasks per day before nudging you to sign in or upgrade. Flint has a free tier that is genuinely useful for light editing and signing, with a day pass for one-off heavier jobs. Neither tool is a true forever-free editor.
Feature parity for everyday work
Both cover the staples: edit text, merge files, split pages, compress, sign, and convert to and from Word. Acrobat Online has tighter Microsoft 365 integrations. Flint has a snappier UI and clearer per-action pricing.
Pricing compared
Acrobat Online's paid tier is similar to Acrobat Pro pricing. Flint is meaningfully cheaper on the annual plan and offers a day pass that Adobe simply does not. If you are an occasional user, that day pass changes the maths.
Best for…
Acrobat Online if you already use Microsoft 365 deeply and want the integration. Flint if you want a cleaner editor, lower price, and a day pass for one-offs. Either way, the days of needing a desktop installer are over.
FAQ
Is Acrobat Online the same as Acrobat Pro?
No. Acrobat Online is a subset focused on browser tasks. Acrobat Pro on desktop still has features Acrobat Online does not.
Can I sign in Acrobat Online for free?
Limited free signing per day. For volume, the paid tier kicks in. Flint has comparable free limits and a day pass option.
Are uploads private?
Both tools use encrypted uploads. Both delete files within a short retention window. Read the privacy page on whichever you choose.
Try the same task in both and pick the one that feels lighter. Most people land on the cleaner UI plus the day pass — but try Acrobat Online too, fair is fair.