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PDF

20

Image & Media

17

AI & Prompts

12

Text

13

Developer

26

Converters

6

SEO & Marketing

8

Generators

12

Productivity

7

Calculators

4

Business

9

Privacy & Security

5

Design

4

Content

5

Education

4

More about this tool

About API Tester

API Tester is a free online tool by Toolpile that lets you test rest api endpoints. No signup required, no software to install, and your files never leave your browser — everything runs locally on your device for maximum privacy.

How to use API Tester
  1. Open the API Tester tool above
  2. Upload your file or paste your content
  3. Configure any options (if available)
  4. Click the action button to process
  5. Download or copy your result instantly
Why use API Tester?
  • 100% private — files processed in your browser, never uploaded
  • Free to use — no subscription required for casual use
  • No signup — start using instantly, no email needed
  • Fast — processes locally without server round-trips
  • Cross-platform — works on Windows, Mac, Linux, iOS, Android
Frequently asked questions

Is API Tester really free?

Yes — Toolpile is free with a fair 3-uses-per-day limit per tool. No credit card required.

Are my files safe?

Completely. API Tester runs entirely in your browser. We never see, store, or transmit your files.

Do I need to install anything?

No installation needed. API Tester works in any modern browser — Chrome, Firefox, Safari, Edge.

Can I use this on mobile?

Yes, Toolpile is fully mobile-responsive and works on iPhone, iPad, and Android devices.