FillOnce vs pdfFiller

Last reviewed 2026-09-15

pdfFiller is a strong cloud PDF editor/filler. FillOnce is better when you need a private multi-person vault that reuses answers across PDF, Word, Excel/CSV, and standards-based web forms — without generative AI on your answers. Last reviewed 2026-09-15.

Start free · 2 people, 3 exports/mo Full comparison matrix

Who each is for

pdfFiller

People who mainly edit, fill, and store PDFs in a cloud workspace and want a broad PDF toolkit.

FillOnce

Parents, freelancers, and privacy-sensitive filers who retype the same details into many structured forms and want encrypted People profiles plus human review.

Feature comparison

FillOnce versus pdfFiller feature comparison
Capability	FillOnce	pdfFiller
Fill fillable PDFs	✓	✓
Fill Word (.docx) forms FillOnce writes back detected DOCX fields; pdfFiller is PDF-first.	✓	~
Multi-person People vault	✓	✗
Standards-based web form fill FillOnce Chrome extension; portal support varies.	✓	✗
Client-side / BYOK vault encryption FillOnce encrypts vault values in the browser with your key after setup.	✓	~
Never auto-submits	✓	✓
No generative AI on vault answers	✓	~

✓ = yes · ~ = partial · ✗ = no. Competitor capabilities vary by product and plan; based on public positioning as of 2026-09-15. pdfFiller paid tiers are typically mid–high single-digit to teens USD/month depending on plan (public pricing varies). FillOnce Free has real limits; Pro is about $9 CAD/month; Family about $14.99 CAD/month.

Choose pdfFiller when…

You need deep PDF editing, templates libraries, or cloud collaboration around PDFs only.
You are fine uploading form answers to a cloud PDF suite.

Choose FillOnce when…

You reuse the same person or company details across many blank forms.
You want PDF + Word + Excel/CSV + standards-based web forms from one vault.
You want BYOK-style encryption and never auto-submit.

FillOnce limits (honest)

Free: 2 person profiles, 5 stored documents, 3 document exports per month.
Formats we fill when fields can be detected: PDF, Word, Excel, CSV, and standards-based web forms.
FillOnce never auto-submits. You review matched fields and submit yourself.
No generative AI on vault answers. Matching is deterministic (optional local embeddings on labels only).
We do not claim every document, every portal, or every field.
Team / org vault plans are not currently for sale.

FAQ

Is FillOnce a pdfFiller replacement?

Only if your job is reuse + privacy across structured forms. If you need a full cloud PDF editor suite, pdfFiller or Acrobat may fit better.

Can FillOnce edit PDFs like pdfFiller?

No. FillOnce detects and fills fields, then exports or converts supported representations. It is not a general PDF editor.

Try FillOnce free

Free: 2 people · 5 docs · 3 exports/mo

Start free · 2 people, 3 exports/mo Related guide Pricing

More comparisons: vs Smallpdf · vs Magical · vs Simplify · vs Adobe Acrobat