25 Free Browser-Based Tools Every Developer Should Bookmark

RoSso XS — Mon, 01 Jun 2026 15:25:13 +0000

As developers, we constantly need small
utility tools — a quick JSON formatter,
a JWT decoder, a Base64 encoder.

The problem? Most sites are slow,
full of ads, or require signup.

I built XSular Tools to fix that:
25 free utilities that run 100% in
your browser.

Developer Tools

JWT Decoder & Generator — decode tokens,
inspect claims, verify signatures, generate
new JWTs. Nothing leaves your browser.
→ www.xsulartools.com/tools/jwt-tool

JSON Formatter & Validator — format ugly
JSON, validate structure, minify for production.
Syntax highlighting included.
→ www.xsulartools.com/tools/json-formatter

Base64 Encoder/Decoder — encode text
and files, decode Base64 strings,
supports URL-safe mode.
→ www.xsulartools.com/tools/base64

Hash Generator — MD5, SHA-1, SHA-256,
SHA-512 from text or files.
Uses native Web Crypto API.
→ www.xsulartools.com/tools/hash-generator

UUID Generator — v1, v4, v5 UUIDs,
bulk generation up to 1000 at once.
→ www.xsulartools.com/tools/uuid-generator

Regex Tester — live match highlighting,
capture groups, replace mode,
common patterns library.
→ www.xsulartools.com/tools/regex-tester

Unix Timestamp Converter — timestamp
to human date and back, all timezones,
live clock.
→ www.xsulartools.com/tools/timestamp-converter

Text Tools

Word Counter — words, chars, sentences,
reading time. Instant, no button needed.
→ www.xsulartools.com/tools/word-counter

Case Converter — UPPER, lower, Title,
camelCase, snake_case. One click.
→ www.xsulartools.com/tools/case-converter

Lorem Ipsum Generator — paragraphs,
sentences, or words. Randomized each time.
→ www.xsulartools.com/tools/lorem-ipsum

Number & Conversion Tools

Percentage Calculator — 3 calculation
types in one page.
→ www.xsulartools.com/tools/percentage-calculator

Age Calculator — exact age, birthday
countdown, zodiac sign.
→ www.xsulartools.com/tools/age-calculator

Unit Converter — length, weight,
temperature, speed, data.
→ www.xsulartools.com/tools/unit-converter

Currency Converter — live rates,
150+ currencies.
→ www.xsulartools.com/tools/currency-converter

Color Tools

Color Converter & Palette Generator —
HEX, RGB, HSL, CMYK conversion +
complementary, analogous, triadic palettes.
Export as CSS variables.
→ www.xsulartools.com/tools/color-converter

All 25 tools: www.xsulartools.com

No signup. No tracking. No paywalls.
Everything runs in your browser.

DEV Community: RoSso XS

25 Free Browser-Based Tools Every Developer Should Bookmark

Developer Tools

Text Tools

Number & Conversion Tools

Color Tools