Guides & Tips
Blog
In-depth guides, tips, and how-tos for Patrache Studio's free browser tools — image, PDF, developer, calculator, and hardware diagnostics, each explained step by step with practical examples.
Tools
Image Compression Guide: Choosing JPG vs PNG vs WebP
Match lossy or lossless to the job: WebP runs 25 to 35 percent under JPEG, AVIF up to 50. How to pick a format for photos, logos, transparency, and animation.
PDF Merge & Split in Browser: Why It's More Private
WebAssembly engines like pdf-lib merge and split PDFs in the browser tab with no upload. The privacy upside and where memory and CPU cap large or OCR files.
QR Code Security: Dynamic QR Risks and Shortened URL Traps
A QR code is just an encoded URL, and most attacks are a sticker pasted over the original. Static versus dynamic codes, shortener risks, and why local wins.
Video Formats Compared: MP4, WebM, MOV, AVI
Container and codec are not the same, so a .mp4 may hold H.264 or unreadable HEVC. Why H.264 stays the safe web default while AV1, ProRes, and MKV own niches.
DevTools
Base64 and URL Encoding: Purpose, Pitfalls, Correct Usage
Base64 inflates data by roughly 33 percent and is neither encryption nor compression. When to use Base64, Base64URL, or percent-encoding, and the traps.
JSON Formatting, Validation, and Schema in Practice
Pretty-printing, syntax validation, and structural validation are three distinct steps. Why JSON.parse accepts string true and JSON Schema catches it.
Regex in Practice: Anchors, Quantifiers, and Capture Groups
Anchors, character classes, quantifiers, and groups solve most everyday matching. Why catastrophic backtracking downed Cloudflare in 2019, and never parse HTML.
UUID v1 vs v4 vs v7: Picking a DB Primary Key
v1 leaks the host, v4 scatters inserts across the B-tree, v7 stays time-sortable. Why a v7 key cuts index fragmentation and drops INSERT latency by two thirds.
Calculator
BMI, BMR, and TDEE: What the Numbers Mean and Don't
BMI, BMR, and TDEE answer different questions and only approximate any one person. Why Mifflin-St Jeor misses adaptive thermogenesis and where each one breaks.
Compound Interest and the Rule of 72
Thirty years at 6 percent grows money 5.74x, relentless rather than magical. Simple versus compound interest, and why the Rule of 72 estimates doubling well.
Exchange Rate Types: Mid-Market vs Cash vs Wire
Banks quote four rates plus an untradeable mid-market rate, and the spread is the margin. How dynamic currency conversion of 5 to 7 percent drives FX cost.
Loan Payment Types: Amortized vs Equal Principal vs Bullet
Amortized keeps payments flat, equal-principal lowers them over time, bullet defers it all. How cash flow, total interest, and rate risk differ by structure.
Diagno
Audio Latency: Measuring Microphone and Speaker Delay
Round-trip latency stacks up across input buffer, processing, output buffer, DAC, and air. Measure it with a loopback cable instead of trusting the 1 ms claim.
Keyboard NKRO and Input Lag for Gaming
Ghosting comes from a diode-less matrix; rollover counts the keys reported reliably. What 1KRO, 6KRO, and NKRO mean and how polling rate shapes real input lag.
Monitor Dead Pixel Test: Causes and Warranty Rules
Dead, stuck, and hot pixels have different causes and different odds of recovery. Detect them with full-screen color tests and how ISO 9241-307 sets warranties.
Webcam Diagnostics: Frame Rate, Resolution, and Lighting
Picture quality comes from sensor, lighting, and transport format, not the megapixels. Why USB 2.0 forces MJPEG and auto-exposure reshapes more than specs.
Daily
Budget Tracking That Lasts: 3 Habit Designs That Work
Budget tracking fails from friction and delayed reward near week six, not weak willpower. Pick a logging frequency, fewer categories, and a real review ritual.
How Accurate Is Calorie and Protein Logging, Really?
Self-report diet tracking underestimates intake by 20 to 30 percent versus labeled water. The four error sources and low-friction logging habits that last.
The 21-Day Habit Myth: What Research Actually Shows
The 21-day rule traces to a 1960 Maxwell Maltz observation, not to habit science. Lally et al. 2010 measured a 66-day median, ranging from 18 to 254 days.
Task Methods Compared: GTD, ZTD, and Bullet Journal
GTD captures every open loop in five steps, ZTD leans on daily MITs, Bullet Journal on paper. Which method fits your task volume, tool tolerance, and patience.