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64+ tools for developers, writers, and everyone else — all free, all in your browser.

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JSON Formatter

Format, validate, and minify JSON instantly in your browser — no upload, no signup.

Base64 Encode / Decode

Encode text to Base64 or decode Base64 back to text — instantly, in your browser.

Word Counter

Count words, characters, sentences, and paragraphs — with live reading time estimates.

QR Code Generator

Turn any text or URL into a downloadable QR code — customizable colors and error correction.

Password Generator

Generate strong, random passwords with a cryptographically secure generator and a live strength meter.

Latest Tools

JSON Formatter

Format, validate, and minify JSON instantly in your browser — no upload, no signup.

JSON to Table

Paste JSON and instantly view it as a readable table — export array data straight to CSV.

Base64 Encode / Decode

Encode text to Base64 or decode Base64 back to text — instantly, in your browser.

UUID Generator

Generate cryptographically random UUID v4 values, one at a time or in bulk.

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Developer Tools

Format, validate, convert, and debug code — JSON, XML, YAML, SQL, HTML, JS/CSS, JWT, hashes, and more.

26 tools

Image Tools

Compress, resize, and convert images between JPG, PNG, and WEBP — entirely in your browser.

7 tools

PDF Tools

Merge, split, and manage PDF files quickly and for free.

5 tools

Text Tools

Count words and characters, generate placeholder text, convert case, and preview Markdown.

7 tools

Business Tools

Invoices, barcodes, and other everyday small-business utilities.

3 tools

Calculators

Fast, accurate calculators for everyday math, finance, and conversions.

4 tools

Email Tools

Look up SPF, DKIM, and DMARC records to diagnose email deliverability.

3 tools

Security Tools

Generate strong passwords, hash data, and check security posture.

3 tools

Utilities

QR codes, password and random generators, color pickers, and more everyday tools.

4 tools

Network Tools

Look up DNS records, calculate subnets, and inspect the building blocks of how things connect online.

2 tools

Why NewKitApp

Instant, no upload

Every tool runs in your browser. There's no server round-trip for the actual work, so results are instant and your data never leaves your device.

No sign-up, ever

Every tool is free and anonymous — no account, no email, no credit card. Use what you need and close the tab.

Built for real work

Each tool ships with genuine documentation — how to use it, examples, and answers to the questions people actually ask — not just a bare input box.

From the Blog

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URL Structure Best Practices for SEO and Usability

A good URL is readable, lowercase, hyphen-separated, short, and stable, the same slug today as in five years. Getting this right helps search engines and humans, and changing it later is expensive.

Checksums and Data Integrity: Knowing a File Hasn't Changed

A cryptographic hash is a fixed fingerprint of a file. Recompute it later and compare, and any change, accidental corruption or deliberate tampering, shows up immediately, which is why downloads, releases, and backups publish them.

Frequently Asked Questions