Available
Security Password Generator
Create strong, customizable passwords instantly without sending anything to a server.
Open Tool → Free Web Utilities
Useful tools, without the clutter.
Fast, focused utilities designed to do one job well. No sketchy downloads, no confusing menus, and no unnecessary friction.
Tool Library
Everything available in one place.
21Tools and planned utilities
Available
Images Image Resizer
Resize images for websites, social media, app stores, and exact custom dimensions directly in your browser.
Open Tool → Available
Everyday Unit Converter
Convert common measurements quickly with a clean, distraction-free interface.
Open Tool → Available
Utilities QR Code Generator
Create custom QR codes for websites, messages, and other text, then download a high-quality PNG.
Open Tool → Available
Finance Mortgage Calculator
Estimate principal, interest, taxes, insurance, HOA fees, and the total cost of a home loan.
Open Tool → Available
Finance Loan Calculator
Calculate monthly payments, total interest, payoff time, and the effect of extra payments.
Open Tool → Available
Health BMI Calculator
Estimate adult BMI with US or metric measurements and view the standard category range.
Open Tool → Available
Developer JSON Editor
Edit, format, minify, validate, copy, and download JSON directly in your browser.
Open Tool → Available
Network Subnet Calculator
Calculate IPv4 networks, subnet masks, broadcast addresses, wildcard masks, and usable host ranges.
Open Tool → Available
Network CIDR Calculator
Determine the correct CIDR block size for your required number of hosts.
Open Tool → Available
Network DNS Lookup
Lookup A, AAAA, CNAME, NS, TXT, SOA, MX, and CAA DNS records.
Open Tool → Available
Network MX Lookup
View mail exchanger records and mail routing priority for any domain.
Open Tool → Available
Network SPF Record Checker
Validate SPF records and detect common email configuration issues.
Open Tool → Available
Network WHOIS / RDAP Lookup
View public registration information for domains and IP addresses.
Open Tool → Available
Network Port Reference
Search common TCP and UDP ports with their typical services.
Open Tool → Available
Network VLAN Calculator
Generate VLAN plans with IDs, gateways, DHCP ranges, and subnets.
Open Tool → Available
Network Fiber Loss Calculator
Estimate total optical link loss including connectors, splices, and margin.
Open Tool → Available
Network Patch Panel Labels
Generate clean rack, panel, and port labels for structured cabling.
Open Tool → Available
Network Bandwidth Calculator
Estimate transfer time and throughput based on link speed and file size.
Open Tool → Planned
Documents PDF Tools
Merge, split, compress, and organize PDF files with simple browser-based utilities.
Coming Soon • Planned
Images Image Converter
Convert images between popular formats without installing extra software.
Coming Soon •Privacy focused
Tools are designed to process information locally in your browser whenever practical.
Fast and focused
Each tool is built around one clear purpose instead of endless menus and unnecessary features.
Free to use
Core utilities remain freely accessible so people can get the job done without creating an account.
More tools are on the way
Suggest a Tool Have a repetitive task that deserves a better utility?
Send us the idea. The best GiestDev tools will come from real problems people deal with every day.