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Supported forms and sites
FillOnce is built for structured forms, not every document or webpage.
| Surface | Supported | Partial / not supported |
|---|---|---|
| Web app documents | Fillable PDFs, Word forms, Excel/CSV sheets | Scanned/image PDFs (OCR best-effort), XFA-only PDFs, arbitrary binaries |
| Chrome extension | Standards-based HTML, open shadow DOM, same-origin iframes, and allowlisted ATS embeds (Greenhouse, Lever, Workday Jobs, iCIMS, production build) | Closed shadow (e.g. some Workday pages), other cross-origin embeds, canvas-only UIs, Chrome's built-in PDF viewer |
| Convert (Plus) | Excel ↔ CSV, fillable PDF → flat PDF; Word → PDF when converter configured | PDF → Word (coming later) |
Common questions
Is my data private?
How does autofill work?
Store your information once in your vault. Upload a fillable PDF, Word document, or Excel intake sheet and FillOnce detects the fields and suggests matches from your vault. You review and approve document fields before export. The browser extension handles regular web forms with one-click fill, then stops so you can review the page and submit it yourself. It never submits a form for you.
What file types are supported?
Fillable PDFs, Word (.docx) forms with blanks, boxes or checkboxes, and Excel or CSV sheets that list a question next to each answer work today. Flat (non-fillable) PDFs are in beta — values are drawn as a text overlay, so preview the exported file carefully. Scanned images can use browser OCR after unlock. The maximum upload size is 10 MB.
PDF opens inside Chrome, can the extension fill it?
No. When a PDF opens in Chrome's built-in viewer, the extension cannot read form fields from that tab. Download the PDF, then upload it in Dashboard → Forms to fill it from your vault. Regular web forms in normal tabs are supported by the extension.
Why doesn't the extension fill every website?
Many pages use closed shadow DOM, canvas widgets, or cross-origin embeds the browser will not let extensions read. FillOnce fills regular web forms (including open shadow DOM and allowlisted Greenhouse, Lever, Workday Jobs, and iCIMS embeds). On multi-step applications, click Fill this page again when new fields appear. We never auto-submit or silently fill sensitive fields.
Why only structured forms?
Autofill needs fields we can find and label. Fillable PDFs, Word/Excel intake sheets, and regular web forms expose those. Handwriting-heavy scans, canvas-only UIs, and closed proprietary widgets often do not, so we say structured forms and supported file types, not any form.
Filling a form for a family member
On a document's review screen, use the “This form is about” selector to choose which household member the form is for. Suggestions and the export are then drawn from that person's vault data. Free is for just you, with 3 filled forms a month; Plus supports up to 6 people in your household.
Billing & cancellation
Manage your plan, payment method, and invoices from Dashboard → Billing. Cancel anytime from the billing portal; your plan stays active until the end of the current period, no claw-backs, no “hard cancel” tricks.
Export or delete my data
You can export your full vault (encrypted JSON) and delete your account at any time from Dashboard → Settings. Deleting your account permanently removes your vault, documents, generated files, and cancels any active subscription.