AIDeveloper
Gemini Token Counter Online: Tokens, Cost and Accuracy
Count Gemini tokens in your browser, see how close the estimate gets to Google’s countTokens on 16 texts, and what a prompt costs on Gemini Pro and Flash.
Nov 66 min read
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Blog & guides
Practical tips, security guides, and productivity advice for the free tools you use every day.
AIImageGuide
How AI Background Removal Works — The Technology Behind Instant Cutouts
Neural networks can separate foreground from background in seconds. Here's how the technology works, why client-side processing matters, and how to get the best results.
May 16, 20267 min read
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AIDeveloper
Prompt Caching Explained: The Cost Math for Claude and OpenAI
How prompt caching works on Claude and OpenAI, what cache writes and hits cost, and a worked example where it cuts a support bot’s bill by 82%.
Nov 47 min read
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AIGuide
Claude API Pricing vs Subscription: Pro, Max and Ultra Compared
What your Claude habit would cost on the API, per message and per month, next to Pro, Max and Ultra. The math on Sonnet, Opus and Fable, with sources.
Nov 36 min read
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AIDeveloper
DeepSeek Token Counter: Exact Counts, Prices and Limits
DeepSeek publishes its tokenizer, so DeepSeek V4 token counts can be exact in your browser. Measured against GPT-4o, plus prices and the 1M token limit.
Nov 26 min read
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AIDeveloper
How Many Tokens Is a Word? Measured Across 14 LLMs
A 1,000-word English text came to 1,151 tokens on GPT-4o and about 1,737 on Claude Opus 5.5. Tokens per word for 14 models, three languages and code.
Oct 286 min read
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AIDeveloper
One Text, Five Tokenizers: LLM Token Counts Compared
We ran one email, code and JSON through five LLM tokenizers. On GPT-4’s tokenizer the email is 139 tokens in English and 463 in Persian.
Oct 266 min read
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AIDeveloper
OpenAI API Cost Calculator: Estimate Your Bill Before You Build
Work out what an OpenAI API feature costs per month before you ship it: the formula, a worked example on GPT-6 and GPT-4o, and what estimates miss.
Oct 246 min read
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AIDeveloper
Claude Token Counter: Estimate Tokens and Cost Online
Count Claude tokens in your browser, see what a prompt costs on Opus, Sonnet and Haiku, and learn when you need Anthropic’s exact count instead.
Oct 95 min read
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PrivacyAI
What Not to Paste Into ChatGPT, and How to Clean It First
Customer emails, ID numbers, card details, HR notes. A practical list of what to keep out of AI chats, and a one-minute way to get the same help without it.
Oct 36 min read
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PrivacyAI
How to Redact Personal Info Before Using AI (and Restore It)
Swap names, emails and numbers for placeholders, let ChatGPT do the work, then put the real details back. A walkthrough with a real support email.
Oct 35 min read
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PrivacySecurity
What Counts as PII? Examples, Grey Areas and AI Chats
Names and ID numbers are obvious. IP addresses, job titles and a birthday plus a ZIP code are not. What personal data really covers, with examples.
Oct 35 min read
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SecurityAI
Is It Safe to Paste API Keys Into ChatGPT? What Actually Happens
Pasting a .env file into an AI chat is a fast way to debug — and a quiet way to leak keys. Where that key goes, and how to get the same help without it.
Oct 15 min read
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SecurityDeveloper
Leaked an API Key? What to Do in the Next 15 Minutes
Pushed a key to GitHub or pasted it into a chat? Revoke first, clean up second. A calm, step-by-step response plan for OpenAI, AWS, GitHub, Stripe and more.
Oct 16 min read
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AIDeveloper
What Does Tokenization Actually Look Like? A Visual Guide
You already know AI models charge by the token. Here is what that actually looks like inside your own sentences — and why the same message can cost twice as many tokens in one language as another.
Aug 255 min read
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AIProductivity
How to Actually Tell What an AI Rewrite Changed
You asked for "a slightly different version" and got back a wall of text. Here is a faster way to see exactly what moved, what stayed, and whether it was worth regenerating at all.
Aug 255 min read
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AIProductivity
How to Write Better AI Prompts (With a Free Checklist)
Vague prompts get vague answers. Here are the five things every strong ChatGPT or Claude prompt has — and a free tool that checks your prompt for them before you hit send.
Aug 226 min read
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PrivacySecurity
The Hidden Data in Your Photos — and How to Remove It
Every photo you take can carry your exact GPS location, camera model, and timestamp baked invisibly into the file. Here is what EXIF metadata reveals, why it matters, and how to strip it in seconds — privately, in your browser.
Jun 46 min read
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PrivacySecurity
How to Remove GPS Location From Your Photos Before Sharing
Most photos carry the exact spot they were taken, accurate to a few metres. Here is how that GPS tag gets there, who can read it, and how to strip it in seconds — without uploading your photo.
Jun 46 min read
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PrivacySecurity
Selling Online? Strip This Hidden Data From Your Photos First
Marketplace and rental photos can leak your home address, your phone model, and when you were home. Here is what buyers can pull from your listing photos — and how to clean them first.
Jun 46 min read
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AIDeveloper
How AI Reads Your Text: Tokens, Costs, and Context Windows Explained
Language models do not read words — they read tokens. Understanding tokens is the key to predicting what an AI request will cost and whether your prompt will even fit. Here is how it works, in plain English.
Jun 47 min read
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AIDeveloper
How to Cut Your OpenAI and Claude API Costs (Without Worse Output)
AI API bills creep up quietly, token by token. Here are the practical levers that actually lower your cost per request — and how to check the savings before you ship.
Jun 47 min read
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AIDeveloper
Context Windows Explained: GPT-4o vs Claude vs Gemini
A bigger context window sounds better — but it changes your cost, your latency, and even your answer quality. Here is what the window really means and how to pick the right one.
Jun 47 min read
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ToolsProductivity
How to Make a WiFi QR Code So Guests Connect Instantly
Stop reading your WiFi password out loud. A single printable QR code lets guests join your network in one scan — here is how to make one in under a minute, free and private.
Jun 46 min read
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ToolsProductivity
QR Codes for Google Forms, Sheets & Docs — the Easy Way
Get people to your Google Form, Sheet, or Doc in one scan — no typing long links. Here is the simple, free way to turn any Google link into a QR code that just works.
Jun 45 min read
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ToolsProductivity
How to Make an Instagram QR Code (and Other Social Links)
Turn your Instagram, TikTok, WhatsApp, or LinkedIn handle into a QR code people can scan to follow you instantly. Free, private, and it works even if they don’t have the app.
Jun 46 min read
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convertersmath
The Hidden Cost of Unit Conversion Mistakes (and How to Avoid Them)
From crashed spacecraft to recipe disasters, unit conversion errors have real consequences. Learn the most common pitfalls and how to convert correctly every time.
May 206 min
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designconverters
HEX, RGB, HSL — What They Mean and When to Use Each
Every color on your screen is just numbers. Learn how HEX, RGB, and HSL encode color, why designers prefer HSL, and how to convert between them.
May 207 min
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securitycryptography
What Is Hashing? A Plain-English Guide to MD5, SHA-256, and Beyond
Hashing turns any input into a fixed-length fingerprint. Learn how it works, why MD5 is broken, and when to use SHA-256 vs. SHA-512.
May 207 min
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web developmentdev tools
URL Encoding Demystified: Why %20 Exists and What It Means
Every space, emoji, and special character in a URL gets percent-encoded. Learn why, how it works, and when to use encodeURIComponent vs. encodeURI.
May 206 min
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web developmentdev tools
Regular Expressions Without the Headache: A Practical Guide
Regex doesn't have to be intimidating. Learn the 20% of syntax that handles 80% of real-world pattern matching, with tested examples you can use today.
May 208 min
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FinanceGuide
Compound Interest: The Math Behind "Free Money" and How to Make It Work for You
Albert Einstein supposedly called it the eighth wonder of the world. Here's how compound interest actually works, with real numbers that show why starting early matters more than investing more.
May 197 min read
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FinanceGuide
How Mortgage Payments Actually Work — Principal, Interest, and the Amortization Trick
Your first mortgage payment is mostly interest. Your last is mostly principal. Understanding this shift can save you tens of thousands of dollars over the life of your loan.
May 197 min read
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FinanceGuide
Salary vs Hourly: How to Compare Pay When the Hours Differ
Convert salary to hourly using the hours you really work, then add paid time off, overtime rules and benefits. Worked examples with real 2026 rules.
May 196 min read
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SecurityGuide
How to Create Strong Passwords You Can Actually Remember
Ditch "password123" for good. Learn the science behind uncrackable passwords and the passphrase technique that makes them memorable.
May 196 min read
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ImageGuide
WebP vs AVIF vs PNG vs JPEG: Which Format to Use (Tested)
We ran a real photo and a screenshot through every format and quality level. WebP won both, PNG grew, and AVIF needs more than a browser to make.
May 186 min read
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DevGuide
JSON Validation Errors: Unexpected Token, Trailing Comma & Fixes
What "Unexpected token", "Expected double-quoted property name" and other JSON errors mean, with the real message and a fix for each one.
May 186 min read
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DevGuide
Base64 Encoding Explained: How It Works and When Not to Use It
Base64 turns bytes into 64 safe text characters and makes data about a third bigger. How it works, measured overhead, and the jobs it is wrong for.
May 185 min read
Read AIImage
How AI Background Removal Works — The Technology Behind Instant Cutouts
Neural networks can separate foreground from background in seconds. Here's how the technology works, why client-side processing matters, and how to get the best results.
May 167 min read
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ImageTools
How to Remove Image Backgrounds for Free in 2026 — No Signup Required
Compare the best free background removal tools. Learn which ones actually work, which ones upload your data, and which one runs 100% in your browser.
May 145 min read
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SecurityPasswords
The Complete Guide to Password Security in 2026
Everything you need to know about creating unbreakable passwords, avoiding common mistakes, and using modern tools to stay secure online.
May 108 min read
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DeveloperWriting
camelCase, snake_case, kebab-case: Which Case Goes Where
One phrase in all 12 text cases, then where each is required: Python and JavaScript names, environment variables, URL slugs, and AP vs Chicago headlines.
May 85 min read
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SEOWriting
Does Word Count Matter for SEO? What Google Says (2026)
Google says it has no preferred word count. The limits that cut your text off are counted in characters: titles, snippets, posts and ads.
May 55 min read
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