Adobe Acrobat and Filly AI both let you complete PDF forms, but they solve different problems. Acrobat is a full PDF editor where filling is one feature among many. Filly AI does one thing — getting forms filled and signed — and automates the retyping that Acrobat leaves to you.
Choose Adobe Acrobat if you need to edit PDFs — rearrange pages, redact, convert formats — and only occasionally fill a form by typing into it. Choose Filly AI if you fill forms repeatedly: it uses AI to detect fields on any PDF or Word file (including scans, via OCR), auto-fills them from saved client profiles, batch-fills one form for many people, and sends no-login e-sign links. Filly has a free plan (10 fills/month); paid plans start at $19/month.
What's the core difference?
Acrobat's Fill & Sign is manual: you click each field and type. That's fine for one form, but small businesses already spend roughly 16 hours a week on administrative tasks, and UK research by Sage found admin consumes so much time that small firms effectively work a 13th month each year. Filly AI attacks exactly that: it reads the form once, then fills it from a profile so the same name, address, and details never get typed twice.
Filly AI vs Adobe Acrobat: feature comparison
| Feature | Filly AI | Adobe Acrobat |
|---|---|---|
| AI field detection on any PDF/Word file | Yes — including scanned forms via OCR | Auto-detects fields on some PDFs; manual placement otherwise |
| Auto-fill from saved profiles | Yes — reusable client profiles | No — each form is typed by hand |
| Batch fill (one form, many clients) | Yes | No |
| E-signature | No-login link; recipient signs in the browser | Yes, via Acrobat Sign (separate limits by plan) |
| PDF editing (pages, redaction, conversion) | No — filling and signing only | Yes — industry standard |
| Free plan | Yes — 10 fills/month, no credit card | Limited free web tools; apps are paid |
| Starting paid price | $19/month | From about $12.99/month (Standard, annual) |
| Install required | No — runs in the browser | Desktop apps for full features; web version available |
When is Adobe Acrobat the better choice?
If your work is about the PDF itself — combining files, editing text inside a document, redacting, converting Word to PDF and back — Acrobat is the right tool. It's the most complete PDF editor available, and its Fill & Sign feature is perfectly serviceable for the occasional form.
When is Filly AI the better choice?
If you fill the same kinds of forms for different people — client intake, government forms, contracts, invoices — the manual approach doesn't scale. With Filly you save each client's details once, then any uploaded form fills itself; a batch fill produces one completed document per client in a single run. Signature collection matters too: industry data shows about 79% of e-signed agreements complete within 24 hours, and roughly half within 15 minutes — compared to days for print-and-scan.
Can you use both?
Yes, and many people do: Acrobat to prepare or edit the document, Filly to fill and send it. They overlap only at the filling step — and that's the step Filly automates. Try it on one of the ready-made form templates or upload your own PDF.
Frequently asked questions
Is Filly AI a replacement for Adobe Acrobat?
Only for form filling and signing. Filly doesn't edit PDFs — no page rearranging, redaction, or format conversion. If filling forms is the part of your PDF work that eats time, it replaces that part.
Does Filly AI handle forms that aren't fillable PDFs?
Yes. Scanned or flat PDFs are read with OCR and AI places your values onto the page. Word documents are supported too, and export in their original format.
Which is cheaper?
Acrobat Standard starts lower (about $12.99/month billed annually) but fills forms manually. Filly starts at $19/month — and has a genuinely free tier (10 fills/month) — but each fill is automated, so the comparison depends on how many forms you complete. See Filly's pricing.
Do recipients need an account to sign?
With Filly, no — they open a link and sign in the browser. Acrobat Sign recipients also don't need an account, but sending limits depend on your Acrobat plan.