VS Code
CodePen
GitHub
Node.js
RegExr
JSFiddle
CodeSandbox
Free ebook for the JS Beginners

Smallpdf
iLovePDF
TinyPNG
converting.to
Convertilo
ConvertGeine
iLoveIMG
Merge PDF, Convert Images, Remove Backgrounds, Trim Audio, Create Visa Photos. Use free online tools directly in your browser without installation.

Which is more popular?
Based on our record, Eloquent JavaScript seems to be more popular. It has been mentioned 218 times since March 2021.
Website, pricing, platforms and company facts side by side.
|
EJS
Eloquent JavaScript
|
|
|
|---|---|---|
| Website | eloquentjavascript.net | convertduck.com |
| Pricing | ||
| Platforms | — | |
| Listed in |
What each product offers, as listed by its team.

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

Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Eloquent JavaScript A Modern Introduction to Programming 3rd Edition by Marijn Haverbeke review
More videos
No ConvertDuck videos yet. You could help us improve this page by suggesting one.
How often each product is chosen within a category, 0–100% relative to the other.

As answered by people managing Eloquent JavaScript and ConvertDuck.
ConvertDuck's answer:
ConvertDuck is distinct because it operates 100% locally within the user's browser. Unlike traditional converters that require uploading files to a remote server, ConvertDuck processes everything on the client side using advanced web technologies (WebAssembly). This means your files never leave your device, ensuring absolute privacy and zero exposure to network vulnerabilities.
ConvertDuck's answer:
You should choose ConvertDuck if you prioritize security. Competitors expose your data to multiple risks: network interception during upload, potential server hacks, and unauthorized data retention. ConvertDuck eliminates these attack vectors entirely. By removing the server from the equation, we guarantee that your sensitive files cannot be stolen, leaked, or infected with malware during the conversion process.
ConvertDuck's answer:
Our primary audience consists of security-conscious individuals, privacy advocates, and professionals who handle sensitive or confidential documents. This includes developers, journalists, corporate employees, and anyone who understands the risks of sharing personal data with unknown third-party servers and wants a "zero-trust" solution for their file management.
ConvertDuck's answer:
ConvertDuck was born from a fundamental distrust of server-side file processing. We recognized that no matter how much a service promises security, once a file leaves the user's computer, it is vulnerable to hacking, interception, and misuse. We built ConvertDuck to prove that convenience doesn't have to come at the cost of privacy, creating a tool that allows users to "leave no trace" on the internet.
ConvertDuck's answer:
ConvertDuck is built using modern, high-performance web technologies including Astro and SolidJS for a fast and reactive user interface. The core conversion engine relies on WebAssembly (WASM), which allows complex file processing tasks to run directly in the browser with native-like performance, removing the need for backend servers.
ConvertDuck's answer:
As a privacy-focused platform accessible to everyone, our user base is diverse and anonymous by design. We serve individual users worldwide who refuse to compromise on data sovereignty. Rather than targeting specific enterprise giants, we empower every user—from students to security experts—to convert their files without fear of surveillance or data theft.
Share your experience with using Eloquent JavaScript and ConvertDuck. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.

If you haven’t read Eloquent JavaScript , go check it out. It’s one of my all-time favourite programming books — hands down. - Source: dev.to / about 1 year ago
Videos, blogs, text-based teachings, YouTube project-based learning, books, and the like are all examples of various methods and mediums of acquiring skills, especially in the software engineering industry. As I continue to navigate... - Source: dev.to / almost 2 years ago
Seconded. I won't recommend it and no one I know has recommended it for a decade. It's hard for someone who doesn't know JS to know which parts has changed and is no longer the way to do things. https://github.com/getify/You-Dont-Know-JS... - Source: Hacker News / about 2 years ago
Tracking ConvertDuck since Jan 2026.
When comparing Eloquent JavaScript and ConvertDuck, you can also consider the following products.

Build and debug modern web and cloud applications, by Microsoft
Compare VS Code to Eloquent JavaScript or ConvertDuck:

PDF document management and conversion suite
Compare Smallpdf to Eloquent JavaScript or ConvertDuck:

A front end web development playground.
Compare CodePen to Eloquent JavaScript or ConvertDuck:


Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.
Compare GitHub to Eloquent JavaScript or ConvertDuck:

Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
Compare TinyPNG to Eloquent JavaScript or ConvertDuck: