EverySolve Blog — Guides, Tutorials & Tool Workflows
Explore practical, human-edited guides, formulas, and workflows for PDF processing, image optimization, financial calculations, and developer utilities.
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How to Compress PDF Files Without Losing Quality
Learn why PDF files grow unexpectedly large and how to reduce file size for email attachments and government upload portals while keeping text crisp.
Published: • Last updated: • 5 min read -
How to Merge Multiple PDF Files Into One Document
Combine separate contracts, invoices, and scanned pages into a single organized PDF file in the right reading order.
Published: • Last updated: • 4 min read -
How to Convert JPG Images to PDF (and Extract JPGs from PDF)
Turn phone camera scans, receipts, and ID photos into clean A4 or Letter PDFs, or render PDF pages into high-resolution JPG images.
Published: • Last updated: • 5 min read -
How to Resize Images for Social Media and Web Platforms
Avoid awkward auto-cropping and blurry uploads with exact pixel dimensions, aspect ratios, and resizing steps for Instagram, LinkedIn, YouTube, and websites.
Published: • Last updated: • 5 min read -
How to Compress Images for Faster Website Speed and Core Web Vitals
Understand lossy vs. lossless image compression, JPEG/PNG/WebP format trade-offs, and practical workflows to improve Largest Contentful Paint (LCP).
Published: • Last updated: • 5 min read -
How to Remove EXIF and Hidden Photo Metadata Before Sharing Online
Learn what hidden GPS coordinates, device serial numbers, and timestamps are stored inside your photos and how to scrub them cleanly.
Published: • Last updated: • 4 min read -
How to Calculate Loan EMI Step by Step (Formula & Amortization Guide)
Understand the mathematical formula behind home, car, and personal loan EMIs, see how monthly interest is amortized, and calculate the savings from prepayments.
Published: • Last updated: • 6 min read -
How to Calculate HRA Exemption and Compare Income Tax Regimes
Learn the 3-condition rule for calculating House Rent Allowance (HRA) tax exemption under Section 10(13A), worked examples, and Old vs. New Tax Regime rules.
Published: • Last updated: • 6 min read -
How to Calculate Fixed Deposit (FD) Returns and Employee Gratuity
Learn the quarterly compounding formula used by banks for Fixed Deposits and the statutory 15/26 formula used to calculate employee gratuity payouts.
Published: • Last updated: • 6 min read -
How to Convert JSON to CSV for Excel and Spreadsheet Analysis
Learn how nested JSON objects and arrays are flattened into tabular CSV columns, how RFC 4180 quote escaping works, and how to avoid Excel import glitches.
Published: • Last updated: • 5 min read -
How to Format, Pretty-Print, and Debug Broken JSON Data
Turn unreadable single-line API payloads into indented JSON trees, minify payloads for production transit, and fix the 5 most common RFC 8259 syntax errors.
Published: • Last updated: • 5 min read -
How to Validate JSON Payloads Against JSON Schema Specifications
Prevent runtime API bugs by validating incoming JSON structures, required keys, data types, and regex patterns against a formal JSON Schema contract.
Published: • Last updated: • 5 min read -
How to Clean, Deduplicate, and Sanitize Messy CSV Spreadsheets
Prepare CRM exports, mailing lists, and financial CSV files by removing duplicate rows, trimming invisible whitespace, and preventing spreadsheet formula errors.
Published: • Last updated: • 5 min read -
How to Generate High-Contrast Vector QR Codes for Print and Business
Create scannable SVG and PNG QR codes for URLs, Wi-Fi networks, and vCards, and learn how ISO/IEC 18004 error correction, quiet zones, and print sizing work.
Published: • Last updated: • 5 min read -
How to Generate Professional Rent and Business Sales Receipts
Understand the difference between an invoice and a receipt, what fields are mandatory for accounting and HRA tax audits, and how to generate clean PDF receipts.
Published: • Last updated: • 5 min read -
How to Generate Employee Salary Slips (CTC, Gross & Net Pay Guide)
Understand how Basic Salary, HRA, allowances, EPF, Professional Tax, and TDS deductions fit together on a monthly payslip and generate clean PDF salary slips.
Published: • Last updated: • 5 min read -
How to Calculate Return on Investment (ROI) and Annualized ROI
Learn the standard ROI formula, how to calculate Annualized ROI across multi-year projects, and how ROI differs from Return on Ad Spend (ROAS).
Published: • Last updated: • 5 min read -
How to Password-Protect and Watermark PDF Documents for Confidentiality
Understand the difference between PDF open passwords, owner permissions, and visual watermarks, and secure confidential contracts in your browser.
Published: • Last updated: • 5 min read -
How to Generate High-Entropy Passwords and Cryptographic Hashes
Learn how password pool entropy is calculated, why Web Crypto CSPRNG matters, and the critical difference between SHA-256 checksums and password hashing.
Published: • Last updated: • 6 min read -
How to Test and Debug Regular Expressions (Regex) Without Backtracking Bugs
Learn practical regular expression syntax, capture groups, lookaheads, and flags, and avoid common mistakes like broken email TLDs and catastrophic backtracking.
Published: • Last updated: • 6 min read -
Everyday Calculators Guide: How to Calculate BMR, TDEE, BMI, Age & Work Hours
Learn the clinical and mathematical formulas behind Basal Metabolic Rate (BMR), TDEE maintenance calories, BMI categories, calendar age, and decimal payroll hours.
Published: • Last updated: • 6 min read -
Indian Retirement & Wealth Planning: SIP, PPF, EPF, NPS, and SWP Formulas Explained
Compare how SIP, PPF, EPF, NPS, and SWP work in India. Includes exact compounding formulas, EEE vs EET tax rules, and a worked retirement corpus example.
Published: • 9 min read -
How to Implement Schema.org JSON-LD Structured Data for Google Rich Results
Learn how to write, validate, and deploy Schema.org JSON-LD structured data for Articles, FAQs, Products, and Local Businesses, plus SERP pixel limits and XML sitemaps.
Published: • 7 min read -
How to Clean URLs, Strip Tracking Parameters, and Build Valid UTM Links
Understand RFC 3986 URL anatomy, remove invasive tracking parameters like fbclid, gclid, and utm_*, fix percent-encoding bugs, and structure clean GA4 campaign links.
Published: • 7 min read -
Specialized QR Codes Explained: How WiFi, vCard, UPI Payment, and WhatsApp QR Payloads Work
Learn the exact URI payload syntax inside WiFi auto-connect, vCard 3.0 digital business cards, NPCI UPI payment links, and WhatsApp/SMS QR codes.
Published: • 8 min read -
Understanding Unix Epoch Timestamps, ISO-8601 Timezones, and Cron Job Expressions
Master 10-digit vs 13-digit Unix epoch timestamps, the Year 2038 32-bit overflow, IANA timezone conversions (UTC, IST, EST/EDT), and 5-field cron syntax.
Published: • 8 min read -
How to Decode JWT Tokens, Understand Base64URL Claims, and Verify HMAC Signatures
Inspect the 3-part RFC 7519 JSON Web Token structure, understand why Base64URL encoding is not encryption, verify HMAC-SHA256 signatures, and generate cryptographic secrets.
Published: • 8 min read