How to Build and Send API Requests Without Leaving the Browser
Compose method, headers, and body; inspect status and timing; copy cURL or fetch when CORS blocks the browser call.
Insights
Blog
Tutorials, explainers, and product updates that help people get more value from the Haivix tool library.
How Compound Interest Grows Savings (and What the Model Leaves Out)
Project growth with contributions, compare rate scenarios, and treat the result as an estimate—not a market forecast.
How to Read and Set Linux chmod Permissions
Build owner, group, and others as octal and symbolic modes, then copy a chmod command without guessing rwx bits.
How to Resize Images to Exact Dimensions
Resize by percent or exact pixels with optional aspect lock, then download files or a ZIP—processed only in your browser.
How to Write a robots.txt File Without Blocking Your Site
Draft Allow/Disallow rules and sitemap URLs, avoid accidental Disallow: /, then copy robots.txt for your host.
How to Convert JSON to CSV Without Breaking Columns
Turn a JSON array into spreadsheet-ready CSV or TSV, flatten nested fields, and protect formula-like cells—locally in the browser.
How to Decode and Inspect a JWT Before You Trust It
Decode header and payload, check expiry, and verify HS256/384/512 locally—decode alone is not authenticity.
How to Look Up DNS Records (A, MX, TXT, and More)
Query common DNS record types over DNS-over-HTTPS and read status, TTL, and answers for mail and web checks.
How Marketplace Fees Change Your Net Profit
Estimate platform and payment fees, product costs, and net profit with editable presets—then confirm live seller rates.
How to Preview Open Graph Images Before You Share
Check a social share card layout, then copy og meta tags before you publish—without scraping the live page.
How to Format and Validate JSON Without Breaking It
Pretty-print, minify, and validate JSON in the browser, then copy or download data.json without uploading the payload.
JSON-LD Schema Markup for Articles and Products
Generate Article, Product, or business JSON-LD, copy the script tag, and validate it with your search platform before you publish.
How to Generate a Strong Password You Can Actually Use
Set length and character sets, generate with crypto.getRandomValues, then copy the value into a password manager.
How to Add or Extract GST and VAT From a Price
Enter an amount and rate, choose inclusive or exclusive, and read net, tax, and gross. Arithmetic only—not tax advice.
How to Calculate IPv4 Subnets and Usable Hosts
Enter CIDR to get network, mask, broadcast, host range, and usable count. IPv4 only—not a VLSM planner.
How to Write Meta Titles and Descriptions That Match the Page
Write clear meta titles and descriptions, preview search and social cards, and copy a clean HTML head snippet without stuffing keywords.
Profit Margin vs Markup: Price Products Without Guessing
Learn the difference between profit margin and markup, model fees and fixed costs, and check break-even before you lock a price.
How to Write Cron Expressions You Can Actually Trust
Build a five-field cron expression, preview the next run times in your local timezone, and avoid day-of-month and weekday mistakes.
How to Create a QR Code That Scans Cleanly
Encode a final HTTPS URL, choose size and contrast that survive print, download a PNG, and scan-test before production.
Test Campaign Links Before You Launch: UTM and Redirect Checks
Validate redirects, lost UTM parameters, and landing-page warnings before you spend budget—then copy a plain-text report.
How to Write an ATS-Friendly Resume (and When to Use a CV)
Learn the difference between a resume and a CV, which layouts travel safest through ATS uploads, and a checklist before you export a PDF.
ARP Identity for Intune Win32 Detection: Observed, Declared, and Why It Matters
Rank Add/Remove Programs identity for Intune Win32 detection, separate predicted installer metadata from observed evidence, and export a custom detection script.
How to Create a Professional Invoice: A Practical Guide
Learn which invoice fields matter, how to write clear payment terms, and what to check before sending a professional PDF.
Free PDF Tools: A Practical Privacy-First Guide
Learn how to merge, split, organize, compress, and convert PDFs with the right workflow and realistic privacy expectations.
Everyday Calculators: How to Check the Numbers That Matter
Use percentage, loan, age, BMI, and tip calculators correctly—and understand what each result can and cannot tell you.
How to Compress Images Without Losing Visible Quality
Learn how to reduce JPG, PNG, and WebP file sizes while preserving the detail people actually notice.
Essential Text Tools for Writers and SEO
Use word counts, case conversion, comparison, and cleanup tools to make writing and SEO reviews faster without exposing draft text.
Introducing Haivix: Private Tools for Faster Everyday Work
Meet Haivix, a growing collection of fast, privacy-first browser tools for PDF, image, text, marketing, and developer workflows.
How We Build Fast Browser Tools That Scale
A practical look at the architecture choices behind fast, dependable, privacy-first browser utilities.