Developer

Developer Tools Hub — JSON, JWT, HTML & DNS Utilities

Free browser utilities for JSON formatting, JWT decoding, HTML beautification, text diff, URL encoding, and DNS lookup.

Published June 1, 2025 · 1 min read

Written by Ethan Brooks · Editor-in-Chief & Product Lead

Reviewed by James Cole

Last reviewed August 19, 2026 · Editorial policy

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3 uses per day · 200 MB · TLS encrypted · auto-delete

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Developer utilities in one place

RatPDF's developer hub covers JSON formatting, JWT decoding, HTML beautification, text diff, URL encoding, binary conversion, DNS lookup, and Base64 image encoding — plus focused guides for common debugging tasks.

Core tools

PDF pipeline tools: HTML to PDF · Blog: HTML to PDF API alternatives · JSON formatter for API debugging · Guides hub: developer tool guides

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3 uses per day · 200 MB · TLS encrypted · auto-delete

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Frequently asked questions

What developer tools does RatPDF offer?

JSON formatter, JWT decoder, HTML formatter, text diff, URL encoder, DNS lookup, Base64.

Are JWT and JSON tools free?

Free tier: 3 uses per tool per day.

Do I need to install anything?

No — all run in the browser.

Sources & references

Primary references used when researching and fact-checking this guide. See our editorial methodology.

Adobe PDF Reference — encryption — Adobe
PDF password protection and encryption standards (ISO 32000).