FillOnce vs Smallpdf

FillOnce vs Smallpdf

Last reviewed 2026-09-15

Smallpdf wins for one-off convert/compress/fill tasks in the browser. FillOnce wins when the pain is retyping the same household or company details into the next blank form. Last reviewed 2026-09-15.

Start free · 2 people, 3 exports/moFull comparison matrix

Who each is for

Smallpdf

Anyone who needs fast, occasional PDF utilities (compress, convert, fill once).

FillOnce

Repeat filers who want a durable vault and blank-form autofill across formats.

Feature comparison

FillOnce versus Smallpdf feature comparison
CapabilityFillOnceSmallpdf
Quick online PDF fill✓✓
Reusable People vault across forms✓✗
Word / Excel / CSV structured fill✓~
Privacy-first vault (BYOK)✓~
Never auto-submits✓✓

✓ = yes · ~ = partial · ✗ = no. Competitor capabilities vary by product and plan; based on public positioning as of 2026-09-15. Smallpdf Pro is commonly around the low–mid teens USD/month (public pricing varies). FillOnce Free proves the loop; Pro ~$9 CAD/month.

Choose Smallpdf when…

  • You need convert/compress tools more than a reusable profile vault.
  • You fill a PDF once and move on.

Choose FillOnce when…

  • School/camp/vendor packets repeat every season or every client.
  • You want multi-person profiles and review-before-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

Should I switch from Smallpdf?

Keep Smallpdf for convert/compress. Use FillOnce when you need the same answers mapped into many blank structured forms.

Try FillOnce free

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

Start free · 2 people, 3 exports/moPricing

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

FillOnce vs Smallpdf — form reuse vs quick PDF tools · FillOnce