10 Handy Online Utilities Every Developer (and Writer) Should Bookmark

DesignPro — Thu, 11 Sep 2025 18:58:03 +0000

Sometimes you just need a quick tool to get a task done—no installs, no sign-ups, no fuss.
Here’s a curated list of free, browser-based utilities I keep in my bookmarks for everyday work.

JSON Formatter & Validator

Quickly prettify or validate JSON when you’re debugging an API response.
jsonlint.com

CaseConvertTool

When you’re dealing with text from different sources—user submissions, design mock-ups, or documentation—consistent casing is key.
CaseConvertTool.com
lets you convert text to uppercase, lowercase, sentence case, or title case in seconds.
Simple, fast, and surprisingly handy for writers as well as developers.

Regex101

Test and debug regular expressions with real-time highlighting and an explanation of every token.
regex101.com

Color Contrast Checker

Ensure your text and background colors meet accessibility guidelines.
contrast-ratio.com

Lorem Ipsum Generator

Generate placeholder text for design mock-ups or prototypes.
lipsum.com

Image Compressor

Reduce image file sizes without noticeable quality loss.
tinypng.com

ShareX (Web Capture)

Quick, customizable screen captures directly from your browser.
getsharex.com

Diff Checker

Compare two text files or code snippets and see differences highlighted instantly.
diffchecker.com

Can I Use

Check browser support for any CSS or JavaScript feature before using it in production.
caniuse.com

Pastebin

Share code snippets or logs quickly with teammates.
pastebin.com

Final Thoughts

None of these sites require sign-ups or complicated setups.
They’re simple, trustworthy utilities that can save you a few minutes—or hours—during busy days.
Bookmark the ones that fit your workflow and you’ll always have the right tool ready when you need it.

DEV Community: DesignPro

10 Handy Online Utilities Every Developer (and Writer) Should Bookmark