The most useful utilities
One page for the jobs people come to VoltKit for: check a connection, shrink a file, format some data, generate a code, convert a unit. Every tool is free, needs no account, and says plainly where your data goes.
Popular
A curated shortlist, not a click counter.
Browse by section
- Image ToolsCompress, resize and convert JPG, PNG and WebP images. Everything runs on your device with the Canvas API.8 tools
- PDF ToolsMerge, split and create PDFs from images. Your documents never leave your browser.3 tools
- Developer ToolsFormat, validate and convert JSON, decode JWTs, generate UUIDs and convert timestamps.18 tools
- Text ToolsCount words and characters, remove duplicate lines and convert text between cases.10 tools
- CalculatorsPercentage, EMI, GST and Indian salary calculators with every formula and assumption shown.12 tools
- ConvertersUnits, time zones and number bases converted instantly on your device, with the factor or formula shown.3 tools
- GeneratorsQR codes, passwords, random numbers and placeholder text generated in your browser and ready to copy or download.4 tools
- SEO ToolsTechnical SEO helpers for marketers and developers: UTM links, meta tags with previews, robots.txt and keyword density.4 tools
- Design ToolsColour conversion, contrast checking and CSS gradient and shadow generators with a live visual preview.4 tools
- Internet ToolsFind your IP, test your connection speed, look up DNS records, check SSL certificates and see how a website responds.15 tools
- Security ToolsRead-only checks of a public website's HTTPS, security headers, cookies, redirects and email authentication, with plain explanations and no fake scores.4 tools
Tools for developers
JSON, JWT, hashing, regex, diffs, DNS and HTTP checks.
- What Is My IP
- DNS Lookup
- SSL Certificate Checker
- Website Status Checker
- Website Technology Checker
- URL Parser
- User Agent Checker
- Subnet Calculator
- Hash Generator
- Regex Tester
- Text Diff Checker
- URL Encoder / Decoder
- HTML Entity Encoder / Decoder
- Number Base Converter
- CSV to JSON Converter
- Cron Expression Parser
- Date Difference Calculator
- Average Calculator
- Unit Converter
- Time Zone Converter
- Sort Lines
- Text Cleaner
- Find and Replace
- Slug Generator
- Lorem Ipsum Generator
- Password Generator
- Random Number Generator
- QR Code Generator
- Meta Tag Generator
- Robots.txt Generator
- Color Converter
- Contrast Checker
- CSS Gradient Generator
- Box Shadow Generator
- Port Checker
- IP Lookup
- ASN Lookup
- WHOIS Lookup
- Website Performance Checker
- Website Insights
- Website Security Checker
- Security Headers Checker
- Email Security Checker
- Redirect Checker
- SVGA Maker
Tools for students
Counters, calculators, converters and study helpers.
Tools for creators
Image and PDF handling, QR codes, text clean-up.
Tools for designers
Colour, contrast, gradients and shadows.
Tools for marketers
UTM links, meta tags, robots.txt, keyword density.
- DNS Lookup
- SSL Certificate Checker
- Website Status Checker
- Website Technology Checker
- URL Parser
- URL Encoder / Decoder
- CSV to JSON Converter
- Discount Calculator
- Average Calculator
- Time Zone Converter
- Sort Lines
- Text Cleaner
- Find and Replace
- Reading Time Calculator
- Slug Generator
- QR Code Generator
- UTM Builder
- Meta Tag Generator
- Robots.txt Generator
- Keyword Density Calculator
- WHOIS Lookup
- Website Performance Checker
- Website Insights
- Website Security Checker
- Email Security Checker
- Redirect Checker
Tools for everyday tasks
The quick jobs everyone runs into.
- What Is My IP
- Internet Speed Test
- Website Status Checker
- User Agent Checker
- Age Calculator
- Date Difference Calculator
- Discount Calculator
- Simple Interest Calculator
- Compound Interest Calculator
- BMI Calculator
- Tip Calculator
- Unit Converter
- Time Zone Converter
- Sort Lines
- Reverse Text
- Text Cleaner
- Find and Replace
- Reading Time Calculator
- Password Generator
- Random Number Generator
- QR Code Generator
- IP Lookup
- WHOIS Lookup
- Website Insights
Looking for something specific? Browse the complete A–Z index of 85 tools.
Questions about the utilities
Which utility should I use to check my connection?
What Is My IP shows the address and approximate location your connection presents; the Internet Speed Test measures real download, upload, ping and jitter; the User Agent Checker shows what your browser reveals. All three are under Internet tools.
Are these utilities really free and account-free?
Yes. Every tool on VoltKit is free, needs no account and has no watermark. Browser-based tools never upload your files; server-assisted checks send only the domain or URL you type, which we don't save, though our web server logs keep each request for about 14 days.
How is the Popular list chosen?
It is curated from the tasks people most often arrive with, not from a live click counter. Analytics on VoltKit are aggregate page counts and do not rank tools per visitor.