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Filllvisa VS Cert Decoder

Compare Filllvisa VS Cert Decoder and see what are their differences

Filllvisa

The easiest way to complete immigration forms, free and entirely in your browser.

Filllvisa Easiest way to fill USCIS forms - no Adobe required
Rating
0 reviews
Pricing
Free
Is it good? Alternatives
Cert Decoder

Decode and verify SSL/TLS certificates online. Extract X.509 details including issuer, validity, SAN, and fingerprint. Fast, secure, and browser-based.

Cert Decoder screenshot
Rating
0 reviews
Pricing
Free
Is it good? Alternatives
OutageDeck
Check the cloud and SaaS vendors your product depends on without opening every status page. Official-source timelines, observed uptime history, and alerts to email, Slack, Teams, Discord, or webhooks. Five-provider email alerts are free. sponsored
Note: These products don't have any matching categories. If you think this is a mistake, please edit the details of one of the products and suggest appropriate categories.

Which is more popular?

Cert Decoder might be a bit more popular than Filllvisa. We know about 1 link to it since March 2021 and only 1 link to Filllvisa.

social mentions
1 vs 1
Legal popularity
100% vs 0%

Base details

Website, pricing, platforms and company facts side by side.

Filllvisa
Cert Decoder
Website fillvisa.com certdecoder.com
Pricing
Free
Free
Platforms
Web Browser
Web
Company 1 - 9 employees · 2026 —
Listed in
Immigration Legal Travel Legal Practice Management Legal Documents Legal Case Management +3
SSL Certificates Decoding Website Monitoring Monitoring Tools +1

About Filllvisa and Cert Decoder

In their own words, as submitted to SaaSHub.

Filllvisa
Cert Decoder

USCIS forms are painful. The official PDFs are XFA-based - broken in most browsers. Third-party tools charge money or require an account just to get started. Fillvisa is different: it runs entirely in your browser, saves your progress to localStorage, and generates a real fillable AcroForm PDF -...

Read more about Filllvisa

Cert Decoder is a free online tool that helps you decode X.509 SSL/TLS certificates in PEM format. It instantly shows important information like the issuer, expiry date, SAN entries, and fingerprint. All data is processed locally in your browser, so nothing is ever sent or stored elsewhere.

Read more about Cert Decoder

Features and specs

What each product offers, as listed by its team.

Filllvisa 5 features
Cert Decoder 4 features
  • Simplified Visa Application Process
    Fillvisa aims to simplify the often complex and confusing visa application process by providing guided step-by-step assistance for filling out visa forms, reducing the likelihood of errors.
  • Time-Saving Convenience
    The platform allows users to complete visa applications online from the comfort of their home, saving time that would otherwise be spent visiting embassies, consulates, or hiring expensive immigration consultants.
  • User-Friendly Interface
    The website is designed to be accessible and easy to navigate, making it approachable for users who may not be tech-savvy or familiar with visa application procedures.
  • Support for Multiple Visa Types
    Fillvisa typically covers a range of visa categories and destinations, offering a one-stop solution for different travel needs including tourist, business, and other visa types.
  • Error Reduction
    By providing structured forms and validation checks, the platform helps reduce common mistakes in visa applications that could lead to delays or rejections.
  • User-Friendly Interface
    Cert Decoder is designed with a simple and intuitive interface that makes it easy for users to navigate and use the tool without requiring extensive technical knowledge.
  • Comprehensive Analysis
    The tool provides detailed analyses of certificates, including information about validity, issuer, encryption algorithms, and more, helping users understand their security certificates thoroughly.
  • Free to Use
    Cert Decoder offers its services free of charge, making it accessible for individuals and organizations without budget constraints.
  • Quick Processing
    The tool processes certificate information rapidly, providing almost instant results for users, which is crucial for time-sensitive tasks.

Possible disadvantages

  • Limited Advanced Features
    Compared to some paid alternatives, Cert Decoder might lack advanced features that are necessary for more complex certificate management and diagnostics.
  • Reliance on Internet Access
    Users need an active internet connection to utilize the tool, which can be a limitation in areas with unreliable internet service.
  • Privacy Concerns
    While using an online service to decode certificates, there can always be privacy concerns regarding sensitive data being uploaded to a third-party server.
  • No Offline Mode
    Cert Decoder does not offer an offline mode, which could be a drawback for users who require functionality without constant internet availability.

Analysis

An editorial look at what each product does well and who it suits.

Filllvisa
Cert Decoder

Overall verdict

  • I don't have verified, up-to-date information about Fillvisa (fillvisa.com), so I can't confirm whether it is a good or reputable service. Visa-related and immigration-assistance websites vary widely in legitimacy and quality, so it's important to verify independently before using or paying for such a service.

Why this product is good

  • I do not have reliable or current data on this specific website's reputation, ownership, or user reviews.
  • Visa-assistance services can range from legitimate document-preparation help to scams, so claims should not be taken at face value without verification.
  • No independent, verifiable reviews or regulatory information about Fillvisa were available to assess its credibility.

Recommended for

  • Not recommended to rely solely on this response—users should independently verify the company's legitimacy through official government visa resources, consumer review sites (like Trustpilot or BBB), and check for verifiable contact information, business registration, and user testimonials before using the service.
  • Individuals seeking visa help should generally prioritize official embassy/consulate websites or licensed immigration attorneys over third-party services with unverified track records.

Overall verdict

  • Cert Decoder appears to be a free online tool for decoding and inspecting SSL/TLS certificates, CSRs, and related cryptographic data, making it useful for quick, no-install certificate analysis, though it should be used with awareness of general web tool privacy considerations when handling sensitive certificate data.

Why this product is good

  • Provides quick, browser-based decoding of certificates without needing to install software
  • Useful for troubleshooting SSL/TLS certificate issues on the fly
  • Simple interface aimed at both technical and semi-technical users
  • No cost to use for basic certificate decoding tasks

Recommended for

  • System administrators needing to quickly verify certificate details
  • Developers debugging SSL/TLS configuration issues
  • IT support staff troubleshooting website certificate errors
  • Students or professionals learning about certificate structure and encoding

Category popularity

How often each product is chosen within a category, 0–100% relative to the other.

Score bands 0–20 21–40 41–50 51–60 61–100
Filllvisa
Cert Decoder
100% 100%
Legal
0% 0%
0% 0%
Monitoring Tools
100% 100%
100% 100%
Travel
0% 0%
0% 0%
Website Monitoring
100% 100%

Questions & Answers

As answered by people managing Filllvisa and Cert Decoder.

What's the story behind your product?

Filllvisa's answer

Built by Junaid, a founder with a personal connection to the immigration experience. The core frustration was that existing free tools were either low-quality fillable PDFs, server-side tools that harvested user data, or paywalled SaaS products. Fillvisa was built to give immigrants the tool they actually deserve - professional-grade, private, and genuinely free.

Cert Decoder's answer:

I built certdecoder.com over the weekend for my own needs. Sometimes in my work, I need to verify and check certificate details.

Which are the primary technologies used for building your product?

Filllvisa's answer

HTML, vanilla JavaScript, pdf-lib (PDF generation), localStorage (persistence), and a per-page -map.js validation config architecture. No frameworks, no backend, no database. Fully static and deployable as a CDN asset.

Cert Decoder's answer:

certdecoder.com was built using just JavaScript and HTML—simple, fast, and with all processing happening locally in your browser, so no certificate data is sent to any server

How would you describe the primary audience of your product?

Filllvisa's answer

Immigrants navigating the U.S. naturalization or adjustment-of-status process on their own - people filing forms like the N-400 without legal representation, often cost-sensitive, frequently non-native English speakers, and deeply privacy-conscious about where their personal information goes.

Cert Decoder's answer:

certdecoder.com is primarily built for developers, sysadmins, cybersecurity enthusiasts, and DevOps engineers.

Why should a person choose your product over its competitors?

Filllvisa's answer

It's free with zero friction - no signup, no paywall, no upsell nag. Your data stays on your device. The output is a properly filled, submission-ready PDF, not a printable web form. For immigrants who can't afford an attorney and don't trust third-party servers with sensitive personal data, that combination is hard to beat.

Cert Decoder's answer:

Simple, fast, and reliable. Some similar tools can’t even decode basic certificates. I rigorously tested my tool with many real-world certificates and covered several edge cases where competitors fall short.

Who are some of the biggest customers of your product?

Filllvisa's answer

As a free consumer tool, Fillvisa doesn't have "customers" in the traditional sense. It has users - immigrants filing USCIS forms independently. There are no named enterprise accounts or notable client logos to list.

Cert Decoder's answer:

certdecoder.com is primarily built for developers, sysadmins, cybersecurity enthusiasts, and DevOps engineers.

What makes your product unique?

Filllvisa's answer

Fillvisa is 100% client-side - no account, no server, no data ever leaves the browser. It runs entirely on localStorage, generates real AcroForm PDFs via pdf-lib, and embeds structured JSON metadata directly into the PDF so forms can be re-imported and resumed later.

No other free USCIS form tool offers that round-trip fidelity.

User comments

Share your experience with using Filllvisa and Cert Decoder. For example, how are they different and which one is better?

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Social recommendations and mentions

Recommendations tracked on public social media and blogs since March 2021.

Filllvisa 1 mention
Cert Decoder 1 mention
  • Ask HN: What Are You Working On? (May 2026)
    Fillvisa – https://fillvisa.com USCIS immigration forms are still distributed as XFA PDFs - a deprecated Adobe format that modern browsers and PDF readers can't render or fill. Immigrants download them, get a blank white page, and give... - Source: Hacker News / 4 months ago
  • Banana.dog back from the dead
    Why? Because I built certdecoder.com and couldn’t find a decent place to submit it. So I said screw it — I’ll build my own. With blackjack and hookers. - Source: dev.to / over 1 year ago

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