The useToolify Blog
Tutorials, tips, and deep-dives into free browser-based tools.
How to Reduce Image Size to 100 KB or 200 KB (Without Blurry Results)
Government forms, job portals and college applications often demand photos under 100 KB or 200 KB. Here is a reliable, step-by-step method to hit the limit without ruining the image.
How to Add Your Name and Date to an Exam Photo (Step by Step)
Some exam forms want your name and the date printed on your photo. Here's how to add both in your browser, avoid a stretched face, and end up with a JPG under the portal's KB limit.
How to Get Text Out of a Photo or Screenshot (Free OCR Guide)
Stop retyping text from photos and screenshots. Learn how to extract editable text with free OCR, check if your photo is sharp enough, and avoid the errors that creep into numbers.
How to Convert PNG and WebP to JPG (and What to Do With HEIC)
Form says "only JPG allowed"? Here's how to convert PNG and WebP images to JPG for free, how to get JPGs out of an iPhone's HEIC photos, and the mistakes that ruin logos.
How to Write a Quotation Your Client Will Actually Say Yes To (With a Worked Example)
A good quotation is clear about what's included, what it costs and how long the price holds. Here's what to put in one, a fully worked rupee example with discount and GST, and the mistakes that cost small businesses jobs.
How to Blur Your Photo Background for a Professional Profile Picture
Messy room behind you in your LinkedIn photo? Learn how to blur the background for free, how much blur to use (with real numbers), and when to remove it instead.
How to Crop an Image in Any Shape (Freehand, Transparent PNG)
Cut out just the part of a photo you want, along its real outline. A step-by-step freehand crop guide, how many points a curve needs, and what to do with the transparent PNG.
How to Sign a PDF Without Printing It (and When a Drawn Signature Isn't Enough)
Print, sign, scan, email: there's a quicker way for most everyday forms. Here's how to add your signature to a PDF in your browser, where to place it, and the cases where a simple signature image won't be accepted.
How to Extract Text from a PDF (and When You Need OCR)
Can't copy text from a PDF? Learn the 10-second test for scanned files, how to extract text for free in your browser, and when you need OCR instead, with a worked example.
What Are AI Tokens and Context Windows? A Plain-English Explanation
Every AI model reads and bills in tokens and forgets anything outside its context window. Learn what tokens are, how to count them, and why long chats get expensive and forgetful.
How to Estimate LLM API Costs Before You Build an AI Feature
AI features can be cheap or ruinous depending on tokens per request. Learn the cost formula, a worked monthly example, and the levers that cut the bill without hurting quality.
Prompt Injection Explained: How Attackers Trick AI and How to Defend Your App
Prompt injection is ranked the number one risk for AI applications by OWASP. Learn how direct and indirect attacks work, real examples, and practical defences for builders and everyday users.
How to Write Better AI Prompts: 8 Techniques That Still Work in 2026
Better prompts get better answers. Learn eight reliable techniques, including role, context, output format, examples and step-by-step reasoning, with before and after examples.