Every tool you need, right in your browser
Fast, free and private. Text, developer, finance, image, PDF and SEO tools that run entirely on your device — your files never leave your computer.
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Featured tools
All toolsWord Counter
Count words, characters, sentences and paragraphs in real time.
JSON Formatter
Format, beautify and minify JSON instantly.
EMI Calculator
Calculate loan EMI, total interest and repayment.
Age Calculator
Calculate your exact age in years, months and days.
Password Generator
Generate strong, random passwords with custom rules.
QR Code Generator
Create QR codes for links, text and more.
Image Compressor
Compress JPG, PNG and WebP images in your browser.
Merge PDF
Combine multiple PDFs into a single document.
Popular tools
Word Counter
Count words, characters, sentences and paragraphs in real time.
Character Counter
Count characters with and without spaces, plus word and line counts.
JSON Formatter
Format, beautify and minify JSON instantly.
UUID Generator
Generate random v4 UUIDs in bulk.
Timestamp Converter
Convert Unix timestamps to dates and back.
Percentage Calculator
Calculate percentages, increases, decreases and ratios.
EMI Calculator
Calculate loan EMI, total interest and repayment.
Age Calculator
Calculate your exact age in years, months and days.
Recently added
Milliseconds to Years
Convert milliseconds to years instantly.
Milliseconds to Months
Convert milliseconds to months instantly.
Milliseconds to Weeks
Convert milliseconds to weeks instantly.
Milliseconds to Days
Convert milliseconds to days instantly.
Milliseconds to Hours
Convert milliseconds to hours instantly.
Milliseconds to Minutes
Convert milliseconds to minutes instantly.
Milliseconds to Seconds
Convert milliseconds to seconds instantly.
Years to Milliseconds
Convert years to milliseconds instantly.
Fast, Free & Private
Lightning fast
Statically generated pages and code-split tools mean near-instant loads and interactions.
Private by design
Your files and text are processed locally in your browser and are never uploaded.
Free forever
No accounts, no paywalls, no limits — every tool is free to use as often as you like.
Free online tools for everyday tasks
Crystal Toolkit brings together 424 free online tools in one fast, privacy-first platform. Whether you need to count words, format JSON, merge PDFs, compress images or generate a strong password, every tool runs entirely in your browser.
Explore tools by category: Text, Developer, Finance, Date & Time, Random & Security, Design, Image, PDF, SEO, Unit Converters.