Sitemap
A comprehensive, structured index of all pages, browser tools, technical guides, and legal documentation across VektraTool.
75 Online Tools
Direct index to every image, calculator, text, and utility tool
34 Published Guides
Mathematical explanations, tutorials, and practical tool guides
Full Transparency
Complete legal policies, cookies disclosure, and privacy terms
Independent operator
Single-operator site with browser-local tool processing
Compress, resize, crop, convert, edit and inspect images, or make a PDF.
- Image Compressor
- Image Resizer
- Image Cropper
- Image Dimensions Checker
- Rotate & Flip Image
- Image Metadata Viewer
- Image Color Picker
- Add Background Color
- Grayscale Image
- Add Border to Image
- Add Watermark to Image
- Image Brightness & Contrast
- Aspect Ratio Calculator
- DPI / PPI Checker
- Compress Image to 50KB
- Compress Image to 100KB
- Compress Image to 20KB
- Signature Resizer
- Passport Photo Maker
- JPG to PNG
- PNG to JPG
- JPG to WebP
- WebP to JPG
- WebP to PNG
- PNG to WebP
- Image to PDF
Dates and hours, percentages, prices, pay, savings, loans, school maths, energy and health.
- Age Calculator
- Percentage Calculator
- Date Difference Calculator
- BMI Calculator
- EMI Calculator
- Discount Calculator
- Average Calculator
- Profit Margin Calculator
- Time Duration Calculator
- Ratio Calculator
- Fraction Calculator
- Tax Calculator
- Unit Price Calculator
- Compound Interest Calculator
- Break-Even Calculator
- Simple Interest Calculator
- ROI Calculator
- Savings Goal Calculator
- Fuel Cost Calculator
- GPA Calculator
- Weighted Average Calculator
- Business Days Calculator
- BMR Calculator
- Salary Calculator
- Pace Calculator
- Electricity Cost Calculator
- Depreciation Calculator
- Body Fat Calculator
Count, convert, sort, clean up and generate text.
QR codes, passwords and links, plus hashes, slugs, UUIDs, JSON, Base64, URLs, colours and timestamps.
Guides & Tutorials
34 articlesPractical guides, formula explanations, and optimization walkthroughs.
- Image Size vs Dimensions: What’s the Difference?
- How to Add a Watermark to an Image Without Ruining the Design
- Gross vs Net Salary: What Comes Off Your Pay, and in What Order
- Image Metadata Explained: EXIF, Dimensions, Camera Data and Privacy
- How to Check Image Metadata and What It Reveals
- How to Resize an Image Without Distorting It
- Discount Maths: Stacked Discounts, Working Backwards and Tax
- Profit Margin vs Markup: How to Calculate Both
- What Counts as a Word? Hyphens, Numbers and Word Limits
- What Counts as a Character? Spaces, Emoji and Limits
- JSON Syntax Errors Explained, and How to Fix Them
- How to Encode and Decode Base64, and What It’s For
- Unix Timestamp Explained: How to Convert Unix Time
- What Is a UUID? Versions, Uniqueness and When to Use One
- How to Create SEO-Friendly URL Slugs
- How to Encode and Decode URLs: Percent-Encoding Explained
- How to Convert HEIC to JPG on iPhone, Mac and Windows
- Passport Photo Rules: Sizes, Background and Common Rejections
- Does PNG to JPG Lose Quality? When to Convert and What Changes
- JPG vs WebP: How Much Smaller, and When to Convert
- How to Check Image DPI and PPI, and What They Mean
- Image Aspect Ratios: Work Them Out and Choose One
- BMI by Hand: The Formula, Worked Examples and Adult Categories
- The EMI Formula Worked Out by Hand, With a Spreadsheet Version
- How Compound Interest Works, With Real Numbers
- What Size Should a Printed QR Code Be?
- How Long Should a Password Be?
- How Many Words Is a Page?
- How to Combine Photos Into One PDF on Your Phone
- How to Compress an Image Without Losing Too Much Quality
- Why Won’t My Image Go Under 50KB or 100KB?
- Calculating Age by Hand: Leap Days, Cut-off Dates and Spreadsheets
- How to Calculate Percentages by Hand, Backwards and Over Several Steps
- JPG vs PNG vs WebP: Which Image Format Should You Use?
Documentation
Company & Legal Information
Official operational terms, technical methodology guides, data protection disclosures, and author profiles.
About & Methodology
About VektraTool
Mission, core principles, technical architecture, and verified operator.
How Our Tools Work
Technical methodology, 13 image specs, and 14 calculator formulas.
Contact & Inquiries
Report issues, suggest tools, or submit privacy requests.
Akmal Ali, Author & Founder
Editorial standards, biography, and published guides.
Legal & Compliance Policies
Privacy Policy
Detailed GDPR legal bases, data controller, and browser storage.
Cookie Policy
Itemized inventory of necessary storage and optional cookies.
Terms of Use
Acceptable use, intellectual property, and service availability.
Disclaimer
Accuracy limits and educational purpose of our calculators and tools.