Free tools that just work.
Fast, simple utilities for converting, calculating, formatting, generating, and creating — directly in your browser. No signup. No uploads. No tracking.
Private by design
Files and text are processed in your browser and never uploaded. Turn off your network and every tool still works.
Fast and free
No signup, no paywalls, no waiting. Tools load instantly from a global edge network.
Simple
Each tool does one thing well. No clutter, no dark patterns, no modal traps. You land, you use it, you leave.
Newest tools
recently addedPassword Strength Checker
See how strong a password really is — entropy, time-to-crack, and a list of issues, all computed in your browser.
Security Tools
NewMy IP Address
See your public IP, approximate location, ISP, and ASN — useful for VPN checks and remote-access setup.
Network Tools
NewStatistics Calculator
Compute mean, median, mode, range, variance, standard deviation, and quartiles from a list of numbers.
Math Tools
Popular tools
The most-used tools on Uttir. Click any to open it instantly.
JSON Formatter
Format, beautify, and validate JSON with adjustable indentation — instantly in your browser.
Developer Tools
UUID Generator
Generate cryptographically random UUID v4 identifiers, one or a thousand at a time.
Developer Tools
Base64 Encoder
Encode any text — including emoji and non-Latin scripts — into standard Base64.
Developer Tools
JWT Decoder
Decode a JWT’s header and payload and check its expiration — without sending it anywhere.
Developer Tools
Regex Tester
Test and debug regular expressions with live matches, capture groups, and highlighted results.
Developer Tools
Word Counter
Count words, characters, sentences, and paragraphs in your text instantly.
Text Tools
Percentage Calculator
Three percentage tools in one: percent of a value, ratio as a percent, and percent change.
Calculators
Age Calculator
Find the exact age in years, months, and days — plus totals and the countdown to the next birthday.
Calculators
Compound Interest Calculator
Project savings growth with compound interest and monthly contributions, year by year.
Calculators
Browse by category
106 tools across 16 categories. Pick a category to see everything in it.
Developer Tools
Format, validate, decode, and generate the things developers deal with every day.
31 tools →Text Tools
Count, convert, compare, and clean up text instantly.
20 tools →Calculators
Quick, accurate calculators for percentages, dates, ages, and finance.
20 tools →Color Tools
Pick colors, convert formats, and check accessibility.
6 tools →Image Tools
Convert, compress, and resize images without uploading them.
12 tools →PDF Tools
Merge, split, and convert PDFs locally in your browser.
5 tools →Converters
Convert between formats, units, and standards.
8 tools →SEO Tools
Generate meta tags, sitemaps, robots.txt, and UTM links.
9 tools →Generators
Generate passwords, IDs, dummy data, and more.
10 tools →Date & Time Tools
Work with dates, times, durations, and time zones.
8 tools →Encoding Tools
Encode and decode Base64, URLs, HTML entities, and more.
8 tools →Data Tools
Transform CSV, JSON, XML, and YAML.
6 tools →Web Tools
Utilities for building and testing websites.
8 tools →Security Tools
Check, generate, and decode security primitives in your browser.
5 tools →Network Tools
Look up IP, DNS, WHOIS, and HTTP headers from your browser.
2 tools →Math Tools
Statistics, equations, sequences, and number theory.
4 tools →From the blog
How to Create Strong Passwords You Can Actually Remember
A practical guide to creating passwords that are both uncrackable and memorable: passphrases, password managers, and the one rule that actually matters. Includes a free browser tool to check any password’s strength.
Aug 13, 2026 · 6 min read
How to Check DNS Records for Any Domain (and What They Mean)
Learn what DNS records are, the most common record types (A, AAAA, MX, TXT, NS, CNAME, SOA, CAA), how to look them up from your browser, and how to use them to verify that a domain points where you think it does.
Aug 12, 2026 · 7 min read
How to Understand Standard Deviation (Without the Jargon)
Standard deviation sounds intimidating but it is just a measure of how spread out your numbers are. Learn what it means, when to use it, and how to calculate it by hand and with a free browser tool.
Aug 12, 2026 · 5 min read