Does pdfFiller have more forms than AttachKit?

Yes — pdfFiller's library of pre-built fillable forms is genuinely one of the deepest available, and if you need an obscure form already templated, it may have it when AttachKit doesn't. AttachKit ships a curated set of the most common US forms (W-9, W-4, I-9, DS-82, DS-11) plus the ability to drop in any PDF and AI-fill it — fewer ready-made templates, but nothing is uploaded and AI fills from your saved profile.

Why pick AttachKit over pdfFiller for filling forms?

Three reasons: privacy (AttachKit fills in your browser; pdfFiller uploads the file), a genuinely free everyday tier (pdfFiller is a 30-day trial then paid), and flat, cancel-anytime pricing (pdfFiller has drawn persistent hard-to-cancel-billing complaints). Plus AI auto-fill from a saved profile, which pdfFiller doesn't offer.

When should I use pdfFiller instead of AttachKit?

When you specifically need a form that's already in pdfFiller's large library and not in AttachKit's smaller set, or when you're committed to its airSlate workflow automation. If that exact template depth is the deciding factor, pdfFiller goes deeper there — just know your document is uploaded to do it.

Alternative · pdfFiller

AttachKit vs. pdfFiller — the deeper form library vs. private, AI auto-fill

pdfFiller: An online form filler and e-signature service (airSlate) with a huge searchable library of fillable forms.

pdfFiller (an airSlate product) is the closest thing on the market to AttachKit's form-filling hub — a large, searchable library of fillable US forms (W-9, I-9, 1040, leases, legal docs) plus e-signature, all in the browser. Its library is genuinely deeper than ours, and if that catalogue is what you're after, it's a real strength. The trade-offs are the usual ones, plus a sharper one: pdfFiller uploads your file to its servers, has no permanent free tier (a 30-day trial), and has drawn persistent complaints about hard-to-cancel billing. AttachKit fills, signs, and redacts the same forms in your browser, with AI auto-fill from a saved profile, and a genuinely free everyday tier.

Why pick AttachKit for these cases

Fills the same forms in your browser — pdfFiller uploads yours to its servers.
A genuinely free everyday tier; pdfFiller is trial-then-paid with no permanent free plan.
AI auto-fill from a saved profile, which pdfFiller doesn't have.
Flat $12/mo, cancel anytime — no trial-conversion or hard-to-cancel billing.
Real redaction + PII scan and an offline-verifiable signature on top of filling.

Side-by-side

A marks the side with the genuine advantage on that row — honestly, including the few where pdfFiller wins.

Price

pdfFillerNo permanent free tier — a 30-day trial, then Basic ~$8/mo ($96/yr) or Premium ~$15/mo ($180/yr), as of 2026. Widely reported hard-to-cancel billing complaints.

AttachKitFree: unlimited fill + 15 signed PDFs/mo, no account, no trial clock. Pro $12/mo (or $120/yr — $10/mo), flat, cancel anytime.

Where your PDF goes

pdfFillerUploaded to pdfFiller's servers (they hold the plaintext) to fill, sign, and store.

AttachKitNowhere — filling and self-signing happen in your browser; the file never leaves the page. Send-to-sign is end-to-end encrypted.

Form / template library

pdfFillerA large searchable library of pre-built fillable forms (tax, immigration, legal, real-estate) — genuinely one of the deepest catalogues anywhere.

AttachKitA curated set of common US forms (W-9, W-4, I-9, DS-82, DS-11) with guided pages, plus 'bring your own PDF' — far smaller than pdfFiller's catalogue.

AI auto-fill from your profile

pdfFillerNo saved-profile autofill — form-filling is manual, field by field.

AttachKitSave your details once; AI fills any form's fields from your profile — and the PDF stays on-device, only field labels go to the model.

Recipient signup or signup-wall

pdfFillerFilling/signing typically requires an account; the trial expires.

AttachKitNo account to fill or self-sign; recipients you send to never sign up either.

True redaction & PII scan

pdfFillerLimited — pdfFiller is a filler/signer first, not a redaction tool.

AttachKitForensic redaction (covered text is flattened away, not just boxed) + AI PII auto-detect, all in your browser.

Verifiable signatures

pdfFillerCloud e-signature with audit trails, stored on pdfFiller's servers.

AttachKitSelf-sign in-browser plus an offline-verifiable signature anyone can check on any device, free — no account or platform lock-in.

	pdfFiller	AttachKit
Price	No permanent free tier — a 30-day trial, then Basic ~$8/mo ($96/yr) or Premium ~$15/mo ($180/yr), as of 2026. Widely reported hard-to-cancel billing complaints.	Free: unlimited fill + 15 signed PDFs/mo, no account, no trial clock. Pro $12/mo (or $120/yr — $10/mo), flat, cancel anytime.
Where your PDF goes	Uploaded to pdfFiller's servers (they hold the plaintext) to fill, sign, and store.	Nowhere — filling and self-signing happen in your browser; the file never leaves the page. Send-to-sign is end-to-end encrypted.
Form / template library	A large searchable library of pre-built fillable forms (tax, immigration, legal, real-estate) — genuinely one of the deepest catalogues anywhere.	A curated set of common US forms (W-9, W-4, I-9, DS-82, DS-11) with guided pages, plus 'bring your own PDF' — far smaller than pdfFiller's catalogue.
AI auto-fill from your profile	No saved-profile autofill — form-filling is manual, field by field.	Save your details once; AI fills any form's fields from your profile — and the PDF stays on-device, only field labels go to the model.
Recipient signup or signup-wall	Filling/signing typically requires an account; the trial expires.	No account to fill or self-sign; recipients you send to never sign up either.
True redaction & PII scan	Limited — pdfFiller is a filler/signer first, not a redaction tool.	Forensic redaction (covered text is flattened away, not just boxed) + AI PII auto-detect, all in your browser.
Verifiable signatures	Cloud e-signature with audit trails, stored on pdfFiller's servers.	Self-sign in-browser plus an offline-verifiable signature anyone can check on any device, free — no account or platform lock-in.

Switching questions, answered

Does pdfFiller have more forms than AttachKit?: Yes — pdfFiller's library of pre-built fillable forms is genuinely one of the deepest available, and if you need an obscure form already templated, it may have it when AttachKit doesn't. AttachKit ships a curated set of the most common US forms (W-9, W-4, I-9, DS-82, DS-11) plus the ability to drop in any PDF and AI-fill it — fewer ready-made templates, but nothing is uploaded and AI fills from your saved profile.
Why pick AttachKit over pdfFiller for filling forms?: Three reasons: privacy (AttachKit fills in your browser; pdfFiller uploads the file), a genuinely free everyday tier (pdfFiller is a 30-day trial then paid), and flat, cancel-anytime pricing (pdfFiller has drawn persistent hard-to-cancel-billing complaints). Plus AI auto-fill from a saved profile, which pdfFiller doesn't offer.
When should I use pdfFiller instead of AttachKit?: When you specifically need a form that's already in pdfFiller's large library and not in AttachKit's smaller set, or when you're committed to its airSlate workflow automation. If that exact template depth is the deciding factor, pdfFiller goes deeper there — just know your document is uploaded to do it.

Try AttachKit now

Drop a PDF — no signup. Unlimited fill & redact in your browser, plus 15 free signed PDFs every month.

Sign a PDF Fill a form Redact PII

Switching for good? Save your details once — every future form auto-fills.