Free Developer Tools That Run in Your Browser

Convert JSON to CSV

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CSV to JSON

Convert CSV to JSON

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JSON Formatter

Beautify & format JSON

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JWT Decoder

Decode JWT tokens

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JSON Viewer

View JSON as tree

Password Generator

Generate secure passwords

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UUID Generator

Generate UUIDs

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Base64 Decoder

Decode from Base64

Bcrypt Hash Generator

Generate bcrypt hashes

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Word Counter

Count words & characters

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Base64 Encoder

Encode to Base64

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Timestamp Converter

Convert timestamps

Recently Added Tools

Fresh utilities added to the kit

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JSON Path Tester

Test JSONPath expressions

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Nano ID Generator

Generate Nano IDs

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Diagram Generator

PopularNew

Text to flowcharts & diagrams

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Domain Rating Checker

PopularNew

Check Domain Rating (DR)

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Domain Age & WHOIS Checker

Check domain age & WHOIS

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DNS & Email Records Checker

Look up DNS & email records

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Meta Tag Generator

Generate HTML meta tags

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Open Graph Preview

Preview Open Graph tags

Browse by Category

Find the right tool for your job. We cover everything from JSON formatting to cryptography.

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JSON Tools

21 tools

Format, validate, convert, and manipulate JSON data.

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CSV & Data Tools

12 tools

View, edit, convert, and transform CSV and tabular data.

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Text Tools

14 tools

Manipulate, transform, and analyze text in various ways.

Encoding & Decoding

14 tools

Encode and decode data in Base64, URL, HTML, and more.

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Hashing & Crypto

11 tools

Generate and verify cryptographic hashes and identifiers.

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JWT & API Tools

9 tools

Decode, inspect, and build JWT tokens and API utilities.

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PDF & Document Tools

8 tools

Preview, format, and convert document and code formats.

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Color & Design Tools

8 tools

Convert color formats and generate CSS design values.

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Date & Time Tools

5 tools

Convert, calculate, and format dates, times, and schedules.

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Developer Generators

8 tools

Generate code snippets, configs, and random values.

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Diagram Tools

1 tools

Turn plain text into flowcharts, sequence diagrams, and more.

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SEO & Domain Tools

3 tools

Check domain authority, age, and WHOIS data from live sources.

Why Use CodeUtilityKit?

Designed for developers who value speed, privacy, and reliability.

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100% Private

All tools run entirely in your browser. No data is ever sent to a server. Your code, tokens, and secrets stay on your device.

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Blazing Fast

No server round-trips means instant results. Tools respond immediately as you type with no loading spinners.

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Completely Free

Every tool is free forever. No sign-up, no subscriptions, no usage limits, and no paywalled features.

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Works Everywhere

Fully responsive design works on desktop, tablet, and mobile. Use it anywhere, even offline.

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100+ Tools

From JSON formatting to cryptographic hashing, we have comprehensive coverage of daily developer needs.

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No Distractions

Clean, focused UI with no ads, no popups, and no clutter. Just the tools you need, when you need them.

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Your Data Stays On Your Device

Every single tool on this website processes your data locally in your browser using JavaScript. We do not have a backend server that handles your input. Your JWT tokens, API keys, passwords, code, and files never leave your computer.

✓ No Server Upload

Data never touches our servers

✓ No Logging

We don't log your inputs or outputs

✓ Works Offline

Tools work without internet after first load

From the Blog

Developer guides and tool tutorials

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Guides

What Is Key Stretching? PBKDF2 & Iteration Counts

A fast hash cracks in seconds. Key stretching runs it thousands of times so each guess costs real time — here's how PBKDF2 and iteration counts work.

8 min read·Aug 18, 2026