Searching for the best AI form filler Chrome extension is a commercial investigation: you are comparing what tools publicly say they do before installing, signing in, or paying. This guide keeps that comparison narrow and transparent rather than presenting a fake hands-on ranking.
Start with the AI form filler product overview if you want to understand SmartAutoFill's workflow before comparing it with other extensions.
Methodology and limits
Review date: July 12, 2026. We compared current public Chrome Web Store listings and vendor documentation available on that date. The review covers only statements that a vendor or browser documentation makes publicly.
This is not a hands-on benchmark. It does not make accuracy or speed claims, and it does not score vendors from marketing metrics, store ratings, or unverified testimonials. Features, limits, and pricing can change, so confirm the current listing and vendor terms before choosing a tool.
Chrome's own guidance for a useful Web Store listing says a listing should set clear expectations. We use that same standard here: where a public source does not clearly document a feature, the table says so instead of filling the gap with an assumption.
What this comparison covers
The dimensions are practical rather than numerical:
- Context and data source: saved profiles, pasted instructions, documents, or browser-saved values.
- Native and custom controls: whether the public source distinguishes ordinary HTML controls from custom widgets.
- Hosted, BYOK, or local mode: whether AI is vendor-hosted, uses a bring-your-own-key setup, or stays within browser-managed autofill.
- Sensitive-field boundary: what the public source says about passwords, payment, identity, consent, or other high-risk fields.
- Submission and user control: whether filling and final submission are separate actions.
- Pricing or setup: only when the current public source states it clearly; otherwise this comparison sends you back to the vendor.
Public-feature comparison
Every vendor row below describes public listing claims, not independently verified performance.
| Option | Public positioning | Context source | Setup or provider | Controls and boundaries |
|---|---|---|---|---|
| SmartAutoFill Chrome listing | General AI-assisted form filling with review on the page and manual submit | Standard profile and scenario context; pasted context or paid hosted AI Materials can supply work history, education, documents, and other supported sources | Hosted account mode with credits, or custom-provider mode with a locally stored key | Current verified support covers visible native text-like fields, native selects, partial text widgets, and one matched paid hosted material for a native file input. Radio and checkbox state, iframes, and custom widgets remain outside the reliable boundary; custom-provider mode does not support materials or file filling |
| Filliny Chrome listing | The listing presents a profile-based AI form filler with multiple profiles and per-site instructions | Profiles can carry reusable information; site-specific context overrides plus test data, vision, and tone controls are listed for adapting a fill | The public listing describes a hosted product and makes hosted privacy and security statements | The listing claims support for modern frameworks and Shadow DOM. Those are vendor claims, not a compatibility benchmark, so users should still test their own custom controls |
| Fillify Chrome listing | The listing centers on a plain-language intent prompt rather than a fixed field template | A personal knowledge base and multilingual form filling are listed as reusable context features | The listing says API keys stay on the device and describes optional offline or local models | Its public positioning is privacy-first. The listing does not turn that positioning into a universal claim for every site or custom widget |
| FormPilot Chrome listing | The listing describes a BYOK form assistant with per-field confidence and local storage and open-source claims | It lists textarea generation and multiple profiles for reusable answers and longer responses | Users can bring a key for GPT, Claude, Gemini, or Groq | The listing claims React and Vue native setters plus semantic native-dropdown matching. These are public implementation claims, not proof of support for every custom component |
| Chrome built-in autofill | Browser-managed autofill for saved names, addresses, payment methods, and passwords | Saved browser values mapped to standard form semantics, including the HTML autocomplete attribute | Built into Chrome and managed through browser settings rather than an AI provider | Best suited to recognized identity, address, credential, and payment fields; page markup and implementation still affect whether standard autocomplete behavior works |
For the web standard behind browser hints, MDN documents the allowed autocomplete attribute values. That is useful context when ordinary browser autofill works on one form but not another.
How to read the table
Public listing detail varies. A listed feature is still a vendor claim, and a missing detail is not proof that the product lacks the feature. Use the official source to build a shortlist, then test the exact form controls and data boundary that matter to you.
For SmartAutoFill, the supported fields and data-handling reference documents the current boundary in more detail. You can also test the extension on a public sample form before using it on a real workflow.
The practical questions are:
- Does the tool have the context source your forms require?
- Does it document what happens with native inputs, choice controls, custom widgets, iframes, and file inputs?
- Where do saved profiles, API keys, generated values, and recent-run data live?
- Are sensitive fields excluded or clearly bounded?
- Can you review values on the page and submit manually?
- Can you verify current setup and cost without relying on an old comparison article?
General form filling is different from job-application tooling
This article covers the general extension category: repeated web forms, CRM or internal tools, surveys, vendor intake, and other cross-site workflows. It does not rank resume parsers, job trackers, or auto-apply products.
If your search is specifically about job-specific resume and application tools, use the job-specific resume and application tool guide. For the conceptual difference between browser-saved values and context-aware filling, read the AI form filler and browser autofill comparison.
Bottom line
The best AI form filler Chrome extension depends on your source data, field types, privacy boundary, and desired level of control. Public listings can narrow the shortlist, but they cannot replace testing your own representative form and reviewing the current vendor documentation.