Useful online tools, without the usual friction.
Convert files, calculate costs, compress images, work with PDFs, format code, count words, and handle everyday conversions from one clean toolkit. Most work directly in your browser.
Fast tools with real outputs
Each tool has its own crawlable page, clear instructions, internal links, and mobile-first interface.
One brand, multiple traffic entry points
Category hubs make it easy for visitors and search engines to discover related tools without turning the site into a maze.
Home & Cost Calculators
Project costs, materials, energy, mortgage and home-planning calculators.
Everyday Calculators
Popular percentage, age, BMI, loan, discount, tax and date calculators.
PDF Tools
Browser-based PDF conversion, merging, splitting, rotation, page extraction and compression.
Image Tools
Compress, resize, crop, convert and inspect images without uploading them to our server.
Text & Writing Tools
Fast counters, converters, cleanup tools and text utilities.
Developer Tools
JSON, Base64, URL, UUID, hashing, JWT, regex and other coding utilities.
Unit Converters
Length, weight, temperature, area, volume, speed, pressure and more.
Generators
QR codes, random choices, color palettes, random numbers and dice.
Video & Audio Tools
Thumbnail extraction, metadata, bitrate and media file-size utilities.
CV & Resume Builders
European, US and UK professional CV/resume builders with printable templates.
Business Calculators
ROI, margins, markup, break-even and salary calculators.
High-intent utility pages
File conversion, PDF tasks, image compression, QR codes, word counting and everyday calculators are common utility-search patterns.
JPG to PDF Converter
Turn one or more JPG or PNG images into a downloadable PDF in your browser.
Open tool →PDF ToolsCompress PDF
Reduce PDF size by re-rendering pages at a chosen quality level in your browser.
Open tool →Image ToolsImage Compressor
Compress JPG, PNG, or WebP images with an adjustable quality level and instant size comparison.
Open tool →Text ToolsWord Counter
Count words, characters, sentences, paragraphs, and estimated reading time as you type.
Open tool →GeneratorsQR Code Generator
Create a static QR code for a URL, Wi-Fi string, contact text, or plain message.
Open tool →CalculatorsPercentage Calculator
Calculate a percentage, percentage change, or what percent one number is of another.
Open tool →Home & CostMortgage Payment Calculator
Estimate principal-and-interest mortgage payments from loan amount, annual interest rate, and term.
Open tool →Developer ToolsJSON Formatter
Format and pretty-print JSON with validation and clear error messages.
Open tool →ConvertersLength Converter
Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles.
Open tool →PDF ToolsPDF to JPG Converter
Render PDF pages as high-quality JPG images directly in your browser.
Open tool →Developer ToolsPassword Generator
Generate strong random passwords with adjustable length and character sets.
Open tool →CalculatorsAge Calculator
Calculate age in years, months, and days from a date of birth.
Open tool →Files stay on the device where possible
Image, text, calculator and many PDF operations are handled in the browser. PDF and QR pages load established JavaScript helper libraries from redundant public CDNs, but Costovia does not upload your selected files to its own server.
Static & fast
No database is required for the core tools, keeping hosting simple and page delivery fast.
Mobile first
Touch-friendly forms, responsive cards, and clear results are designed for phones as well as desktops.
Internal discovery
Each page links back to its category and related tools to support crawling and user navigation.
Ad ready
Reserved placements are included without covering the main tool or creating intrusive interstitials.
Popular calculators, PDF tools and cost estimators
Start with a focused tool, enter your own values, and review the result before using it for an important decision. Cost and finance tools are planning aids; local quotes, official disclosures and professional requirements can differ.
High-demand everyday tools
Age Calculator · JPG to PDF · PDF to JPG · BMI Calculator · Merge PDF · Loan Calculator · Image Compressor · Mortgage Payment Calculator
Home project planning
Concrete Slab Cost Calculator · Window Replacement Cost Calculator · Drywall Calculator · Paint Calculator · Electrician Cost Calculator · Plumber Cost Calculator · Fence Cost Calculator · Landscaping Cost Calculator · Siding Replacement Cost Calculator · Kitchen Remodel Cost Calculator