Your Input Stays in Your Browser
What you type or paste into the tools is processed on your device and isn't sent to our servers.
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Free browser-based tools, no sign-up
Developer Tools That Respect Your Privacy
10 free, browser-based utilities for developers, marketers, and designers. No sign-up, and what you type or paste into a tool is processed in your browser instead of being uploaded.
Toolkit
Everything You Need, Nothing You Don't
- TextCode
Diff Checker
Compare text and code side-by-side with instant highlighting.
- MarketingBusiness
QR Generator
Create customisable QR codes with zero expiry or tracking.
- Remote WorkTeams
Timezone Visualizer
Plan meetings across global time zones with overlap detection.
- MarketingAnalytics
UTM Builder
Build campaign URLs with local history for marketing analytics.
- DataAPI
JSON/CSV Formatter
Format, minify and validate JSON, and convert between JSON and CSV.
- CSSDesign
Tailwind UI Gen
Visual shadow, gradient, and border-radius generator for Tailwind.
- ImagesBulk
Image Resizer
Bulk resize images client-side with Canvas API. No uploads.
- TestingMock Data
Dummy Data Gen
Generate locale-aware fake data for US/UK testing workflows.
- SEOSocial
OG Previewer
Preview Open Graph and X card tags and copy the generated tags.
- CodeValidation
Regex Tester
Test patterns with plain-English explanations and match highlighting.
Privacy and speed
No Waiting for a Server
Tools run in your browser with JavaScript and the Canvas API, so results appear without a round trip.
No Sign-Up or Tracking Cookies
Use every tool without an account. The Privacy Policy explains the little the site does collect.
Free Online Developer Tools (No Data Upload)
DevMelDex offers free online developer tools including a diff checker, JSON formatter, QR code generator, regex tester, UTM builder, image resizer and more. The tools run in your browser, so the text, data and images you work with aren't uploaded to our servers.
Whether you are comparing text with our diff checker, formatting structured data with JSON formatter, or testing patterns with regex tester, DevMelDex helps you work faster and securely.
Because the tools keep your input in your browser, they suit work with drafts, configuration and test data you would rather not upload. There are no sign-ups and no tracking cookies; the Privacy Policy explains the services the site itself uses.