DevToolKit

DevToolKit bundles the everyday utilities developers reach for — a JSON formatter, Base64 encoder, JWT decoder, regex tester, QR generator, and 17 more — into one clean, offline Android app. No tabs to juggle, no websites to load, no data sent anywhere.

Whether you are reviewing a pull request on your phone, debugging a production issue away from your laptop, or just need to decode a token on the bus, DevToolKit has the tool on a single tap.

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22 TOOLS, ORGANIZED

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FORMATTERS

• JSON Formatter — beautify, minify, and validate JSON

• XML Formatter — pretty-print or minify XML

• SQL Formatter — format queries with keyword highlighting

• Markdown Preview — render Markdown live

ENCODERS & DECODERS

• Base64 — text encode/decode

• URL Encoder — escape URLs and query strings

• HTML Entity — encode/decode HTML entities

• JWT Decoder — header, payload, and expiry check

• Base64 Image — convert images to and from Base64

GENERATORS

• UUID — v4 random IDs, single or batch

• Hash — MD5, SHA-1, SHA-256, SHA-512 (live update)

• Lorem Ipsum — paragraphs, sentences, or words

• Password Generator — SecureRandom, strength meter, configurable

CONVERTERS

• Timestamp — Unix epoch ↔ human date (UTC / local / ISO)

• Number Base — dec, hex, oct, bin with auto-sync fields

• Color — HEX, RGB, HSL with live preview

• JSON ↔ YAML — one-click conversion both ways

TEXT TOOLS

• Regex Tester — live matches, capture groups, flags

• Text Inspector — word / character / line count, case converter

• Text Diff — line-by-line colour-coded diff

BONUS

• CRON Parser — plain-English description of any cron expression

• QR Generator — turn text or URLs into scannable QR codes

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WHY DEVTOOLKIT

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• 100% offline — everything runs on your device. Paste JWTs, API keys, and production JSON without sending bytes to a server.

• Clean, ad-light experience — a single banner, no pop-ups, no interstitials between tools.

• Dark mode optimized — syntax colours adapt; monospace font across every tool.

• Material Design 3 feel with quick search and grouped categories.

• No account, no signup, no tracking across sessions.

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FREE AND PREMIUM

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Seven core tools (JSON, Base64, URL, Hash, Number Base, Lorem Ipsum, Timestamp) are available to everyone. The other fifteen advanced tools are part of Premium — a single one-time purchase with no subscription. Prefer not to buy? Watch a short video ad to unlock any tool for the session, or go Premium to remove the banner and unlock everything permanently.

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PERFECT FOR

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• Backend and front-end developers reviewing API payloads on mobile

• QA engineers decoding tokens and diffing test outputs

• DevOps and SRE on-call, away from the laptop

• Students learning data formats, encodings, and regex

• Anyone who keeps pasting "json beautifier" into their browser

Got a tool we should add? Tap Contact Us in Settings — we read every message.