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JustFill.app VS Cert Decoder

Compare JustFill.app VS Cert Decoder and see what are their differences

JustFill.app

Fill any PDF — even scans and flattened forms Adobe can't open. AI finds every field, so you can type, fill and reuse it online. Mail merge from Excel or CSV gives you one filled PDF per row.

No screenshot yet
Rating
0 reviews
Alternatives Is it good?
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
Alternatives Is it good?
DocRaptor
As the only API powered by the Prince HTML-to-PDF engine, DocRaptor provides the best support for complex PDFs with powerful support for headers, page breaks, page numbers, flexbox, watermarks, accessible PDFs, and much more 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?

Based on our record, Cert Decoder seems to be more popular. It has been mentioned 1 time since March 2021.

social mentions
0 vs 1
PDF Tools popularity
100% vs 0%

Base details

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

JustFill.app
Cert Decoder
Website justfill.app certdecoder.com
Pricing
Official pricing
Free
Platforms —
Web
Listed in
PDF Tools Document Automation Form Builder
SSL Certificates Decoding Website Monitoring Monitoring Tools +1

About JustFill.app and Cert Decoder

In their own words, as submitted to SaaSHub.

JustFill.app
Cert Decoder

JustFill fills PDF forms that other tools refuse to open — scans, photos of paper documents, and flattened forms that contain no form fields at all. How it works. Upload a PDF and an AI detector finds the fields on the page, including checkboxes and comb boxes on scanned documents. Type your...

Read more about JustFill.app

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.

JustFill.app 5 features
Cert Decoder 4 features
  • Automated Form Filling
    JustFill.app automates the process of filling out repetitive forms, saving users significant time and reducing manual data entry effort.
  • User-Friendly Interface
    The platform is designed with simplicity in mind, making it accessible for users who may not be highly technical to set up and use form-filling automation.
  • Browser Extension Convenience
    Being available as a browser extension allows users to fill forms directly within their normal browsing workflow without switching between multiple applications.
  • Time Savings
    By automating data entry into web forms, users can complete tasks like job applications, registrations, or surveys much faster than manual entry.
  • Reduces Data Entry Errors
    Automated filling can help minimize typos and inconsistencies that often occur with manual form completion.
  • 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.

JustFill.app
Cert Decoder

No analysis of JustFill.app yet.

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
JustFill.app
Cert Decoder
100% 100%
PDF Tools
0% 0%
0% 0%
SSL Certificates
100% 100%
100% 100%
Document Automation
0% 0%
0% 0%
Decoding
100% 100%

Questions & Answers

As answered by people managing JustFill.app and Cert Decoder.

What's the story behind your product?

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?

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?

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?

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?

Cert Decoder's answer:

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

User comments

Share your experience with using JustFill.app 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.

JustFill.app 0 mentions
Cert Decoder 1 mention

Tracking JustFill.app since Aug 2026.

  • 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

Alternatives to JustFill.app and Cert Decoder

When comparing JustFill.app and Cert Decoder, you can also consider the following products.

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