GameParticles

Guides

12 guides

Short, practical reads on the formats and tasks our tools handle: what the thing is, where it trips people up, and the free tool that does it in one step.

Developer

JSON, regex, JWTs, hashes and the formats you meet every day.

DeveloperUpdated

Base64 Encoding Explained: What It Is and When to Use It

Base64 explained in plain terms: how it turns bytes into text, why it is not encryption, base64url for JWTs and URLs, and code examples in JS and Python.

DeveloperUpdated

Cron Expression Cheat Sheet With Real Examples

Cron syntax on one page: the five fields, the four operators, copy-ready schedules, and the gotchas around day-of-week OR logic, DST and nonstandard variants.

DeveloperUpdated

How to Decode a JWT and Read Its Claims Safely

Decode a JWT by splitting its three base64url segments, read claims like iss, sub and exp, and learn why decoding a token is not the same as verifying it.

DeveloperUpdated

How to Format and Validate JSON (and Fix Common Errors)

Learn how to format, validate and minify JSON, read parser error messages, and fix the usual culprits: trailing commas, single quotes and unescaped text.

DeveloperUpdated

Regex Cheat Sheet for Beginners: Patterns You Actually Use

The regex constructs you actually use: character classes, quantifiers, anchors, groups and flags, with copy-ready patterns for dates, emails, slugs and cleanup.

Text

Counting, cleaning, converting and comparing text.

TextUpdated

Word and Character Limits Explained: Tweets, Meta Tags, Essays and More

Exact character and word limits for X, Instagram, LinkedIn, title tags, meta descriptions, SMS, college essays and commits, plus how each platform counts them.

Images

Compressing, resizing, converting and editing images in the browser.

ImagesUpdated

How to Compress Images Without Losing Quality

Shrink JPG, PNG and WebP files by 50 to 80 percent with no visible loss. Which quality setting to use, when to resize, and which format to pick for the web.

ImagesUpdated

How to Convert HEIC to JPG on Windows, Mac and Android

Convert iPhone HEIC photos to JPG on Windows, Mac or Android using built-in apps, plus a free in-browser converter that handles whole batches at once.

Colors

Color formats, palettes, gradients and contrast.

ColorsUpdated

HEX, RGB and HSL Color Codes Explained (With Conversions)

What HEX, RGB and HSL color codes mean, how to read them, how to convert between them by hand, and which one to use in CSS, with worked examples throughout.

ColorsUpdated

WCAG Color Contrast Explained: Ratios, AA vs AAA and How to Check

What a contrast ratio is, the WCAG thresholds of 4.5:1 and 3:1, how AA differs from AAA, the exceptions, and how to check and fix failing text and UI colors.

Date & time

Timestamps, time zones, durations and timers.

Date & timeUpdated

Unix Timestamps Explained: Seconds, Milliseconds and Time Zones

What a Unix timestamp is, how to tell seconds from milliseconds, why time zones do not change it, the 2038 problem, and how to convert epoch values in code.

Random & generators

Passwords, UUIDs, QR codes, placeholder text and random numbers.

Random & generatorsUpdated

How to Create a Strong Password (and Why Length Beats Complexity)

How to create a password that resists cracking: why 16 random characters beat 8 complex ones, how entropy works, passphrases, and what to do with the result.

JSON Formatter
Developer · Format, validate and minify JSON with syntax highlighting.
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Base64 Encode / Decode
Developer · Encode text to Base64 or decode Base64 back to plain text.
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URL Encoder / Decoder
Developer · Encode or decode URL components and query strings.
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Hash Generator
Developer · Generate MD5, SHA-1, SHA-256 and SHA-512 hashes.
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UUID Generator
Developer · Generate UUIDs v4 (random) in bulk with one click.
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Regex Tester
Developer · Test regular expressions against text with live match highlighting.
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Word Counter
Text · Count words, characters, sentences, paragraphs and reading time.
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Case Converter
Text · Convert text between UPPER, lower, Title, camelCase, snake_case and more.
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List Sorter
Text · Sort, reverse, deduplicate and shuffle lists of text.
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Markdown Preview
Text · Write Markdown and see a live rendered preview side by side.
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Percentage Calculator
Numbers · Calculate percentages, increases, decreases and what % one number is of another.
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Color Converter
Colors · Convert colors between HEX, RGB, HSL and HSV instantly.
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Snake
Arcade · Eat food, grow longer, don't hit the walls. A timeless classic.
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2048
Puzzle · Slide tiles and combine them to reach the legendary 2048 tile.
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Word Grid
Puzzle · Guess the hidden five letter word in six tries using color clues.
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Sudoku
Puzzle · Fill the 9x9 grid with logic. Four difficulties from easy to expert.
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Minesweeper
Strategy · Use number clues to clear the minefield. Classic logic, three levels.
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Breakout
Arcade · Smash every brick with paddle and ball. Power-ups, combos, endless levels.
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Typing Practice
Casual · Build your WPM and accuracy with timed drills from 30 seconds to 5 minutes. Find your weak keys.
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TypeRunner
Arcade · Multiplayer typing race. Race friends by link, beat computer runners, or chase your own ghost.
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Typing Blocks
Arcade · Type each word before its wooden block lands. Miss, and the pile climbs toward the line.
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Bubble Shooter
Arcade · Aim, bank shots off the walls, and pop groups of three or more bubbles.
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Road Rush
Arcade · Race seven rivals through traffic and punch your way to the front.
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