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toolzone.my/json-formatter

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TOOLS

28 Ready

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Local Processing

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PRICE

100% Free

Tool Category Map

A quick view of the 28 tools grouped by category. Click a bar to filter tools.

Count words, chars, reading time

UPPER, lower, camelCase & more

Lorem Ipsum Generator

Generate placeholder text

Flip text chars or words

Beautify & validate JSON

Encode or decode Base64

Encode/decode URL strings

Escape HTML entities

Test regex patterns live

MD5, SHA-256, SHA-512

Color Converter

HEX, RGB, HSL, CMYK

CSS Gradient Maker

Build gradients visually

Password Generator

Cryptographically strong

Length, weight, temp, speed

Exact age in years/days

Body mass index checker

Random Number Gen

Generate random numbers

Meta Tag Generator

OG, Twitter, SEO tags

Timestamp Converter

Unix ↔ readable date

Decode JWT header & payload

Random UUID v4 in bulk

Compare two texts line by line

SEO-friendly URL slugs

Latest practical guides

Short explainers for the problems people search before opening a tool.

All guides →

Text Title Case vs Sentence Case Know which style to use in headings, buttons, filenames and code. Developer URL Encoding Query Parameters Fix broken links with spaces, ampersands, hashes and Unicode. Math Unit Conversion Formulas Convert metric, imperial, temperature and speed without guessing. Health BMI Formula Metric and Imperial Calculate adult BMI and understand why it is only a screening number. Finance Loan Payment Formula Estimate monthly payment, total interest and full repayment cost. Developer Convert JSON to CSV Prepare JSON arrays for Excel, Google Sheets and database imports.

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Free Online Tools for Developers & Productivity

ToolZone is a curated collection of 28 free online tools for developers, designers, writers, and everyday productivity. Every tool runs entirely in your browser — no signup, no uploads. Your tool input never leaves your device.

Format and validate JSON, generate strong passwords, encode and decode Base64 or URLs, test regular expressions, convert colors, build CSS gradients, calculate BMI or age, generate Lorem Ipsum, hash text with MD5 or SHA-256, and more — all from a single fast, private, dark-themed workspace.

Whether you're a developer needing quick utilities, a designer working with colors and gradients, or a writer counting words and characters, ToolZone gives you instant, low-clutter access to professional-grade web tools that work offline once loaded.

Free Diff Checker — Compare Two Texts Online

Paste two versions of any text, code file, contract or config and see exactly which lines were added, removed or changed. A fast alternative to git diff when you just need to compare two snippets — and everything stays in your browser.

Features

Line-by-line comparison with added / removed highlighting
Works with code, prose, CSV, logs and configs
No file upload — comparison happens locally
Handles long documents

How to use

Step 1. Paste the original text on the left.
Step 2. Paste the changed text on the right.
Step 3. Review the highlighted differences below.

Real use case: finding what changed in a contract before signing

A project manager receives "v3 final" of a supplier contract with a note saying only the payment terms changed. Reading fourteen pages twice to verify that claim is not realistic before the meeting.

Pasting v2 and v3 side by side surfaces every difference in seconds: the payment term did change from 30 to 45 days — and so did a liability cap that was not mentioned. The same workflow catches an unannounced edit in a config file or a translated string file.

How Diff Checker works

The comparison uses a longest-common-subsequence algorithm — the same family that powers git diff. It finds the largest set of lines that appear in both texts in the same order, then marks whatever remains as an addition or a deletion, rather than naively comparing line 1 to line 1.

That ordering awareness is what makes an inserted paragraph show as one added block instead of shifting every following line into a false mismatch.

Both texts stay in your browser, which matters when the documents are contracts, credentials or unreleased copy — nothing is uploaded to compare it.

Diff Checker vs similar tools

Diff tooling compared:

Tool	How it works	Trade-off
git diff	Compares tracked file versions in a repository.	Unbeatable for code, useless for two blobs of text pasted from email.
Word 'Compare Documents'	Tracked-change view of two .docx files.	Requires Word and real files; formatting noise can drown real edits.
ToolZone Diff Checker	Paste two texts, get a line-level added/removed view locally.	Plain text only — it does not diff binary or richly formatted documents.

Frequently Asked Questions

Can I compare code files?

Yes — paste the contents of both files. Comparison is line-based, the same unit git and most code review tools use.

Are my documents uploaded?

No. The comparison runs in JavaScript in your browser, so confidential contracts and source code never leave your device.

Related Text tools

Guides worth reading

Browse all ToolZone guides →