Free Online Tools
Small tools that do one job well — counters, text generators and symbol collections. Every tool runs in your browser: free, no sign-up, and your text is never uploaded.
The main tool
DetZero AI Detector
Our free AI checker for ChatGPT, GPT-5, Claude, Gemini and DeepSeek text — with sentence-by-sentence highlighting. See also the ChatGPT Detector and AI Checker Free pages.
Text counters & utilities
Word Counter
Words, characters, reading time and platform limits, live as you type.
Character Counter
Characters with and without spaces, plus X / Threads / Instagram bars.
Letter Counter
Count letters only — ignoring digits, spaces and punctuation.
Sentence Counter
Sentence count, average length, longest and shortest sentences.
Syllable Counter
Syllables plus a Flesch reading-ease score.
Reading Time Calculator
How long a text takes to read or present, at your own pace.
Case Converter
UPPERCASE, lowercase, Title Case, sentence case and more.
Remove Duplicate Lines
Strip repeated lines from any list, keeping the first copy.
Alphabetize List
Sort lists A–Z, Z–A, by length, or shuffled.
Fancy text & font generators
Fancy Text Generator
20+ stylish Unicode styles for names, bios and posts.
Font Generator
Copy-and-paste fonts for profiles and posts.
Italic Font Generator
Italic, bold italic and script italic styles.
Discord Font Generator
Styles that render properly in Discord names and chats.
Instagram Font Generator
Bio-ready fonts for Instagram names and captions.
Symbols & kaomoji — click to copy
Copy & Paste Symbols
The popular collection — a bit of everything.
Arrow Symbols
Dozens of arrow styles for lists, posts and designs.
Heart Symbols
Classic, coloured, outlined and broken hearts.
Star Symbols
Stars and sparkles for ratings and posts.
Cross Symbols
Christian crosses and X marks.
Cute Symbols
Bio decoration: hearts, flowers, sparkles and strings.
Music Symbols
Notes, clefs, sharps and flats.
Currency Symbols
Currency signs from around the world.
Kaomoji
Japanese text faces for every mood (◕‿◕).
Timers, clocks & dates
Online Timer
Set any countdown, with presets and an alarm.
1 Minute Timer
One-click 1-minute countdown with alarm — for a one-minute reset.
2 Minute Timer
One-click 2-minute countdown with alarm — for toothbrushing and speed rounds.
3 Minute Timer
One-click 3-minute countdown with alarm — for noodles, eggs and short meditations.
5 Minute Timer
One-click 5-minute countdown with alarm — for breaks and steeping tea.
10 Minute Timer
One-click 10-minute countdown with alarm — for task sprints and workouts.
15 Minute Timer
A popular preset — one click to start.
20 Minute Timer
One-click 20-minute countdown with alarm — for power naps and reading.
25 Minute Timer
The Pomodoro work interval, ready to go.
30 Minute Timer
One-click 30-minute countdown with alarm — for workouts and weeknight cooking.
45 Minute Timer
One-click 45-minute countdown with alarm — for a class or lesson period.
60 Minute Timer
One-click 60-minute countdown with alarm — for exams, meetings and deep work.
Online Stopwatch
Count up with lap times and tenths.
Online Alarm Clock
Set an alarm that rings in your browser.
Countdown Timer
Days, hours and seconds to any date.
World Clock
Live time in New York, London, Tokyo and more.
City pages: New York · London · Tokyo · Los Angeles · Chicago · Houston · Phoenix · Colorado · Toronto · Sydney
Days From Today Calculator
What date is N days from now? Any number, future or past.
30 Days From Today
The exact date 30 days from now, computed live.
60 Days From Today
The exact date 60 days from now, computed live.
90 Days From Today
The exact date 90 days from now, computed live.
180 Days From Today
The exact date 180 days from now, computed live.
365 Days From Today
The exact date one year from now, computed live.
Days Between Dates
Count the days between any two dates.
Age Calculator
Exact age in years, months and days.
Calculators
Percentage Calculator
Percent of a number, and X is what % of Y.
Percent Change Calculator
Increase or decrease between two values.
Percentage Increase Calculator
How much a value grew, in percent.
Percentage Decrease Calculator
How much a value fell, in percent.
Percentage Difference Calculator
Compare two values symmetrically, as a percent of their average.
Online Calculator
A clean, simple calculator.
Tip Calculator
Tips and splitting the bill per person.
Discount Calculator
Sale price and how much you save.
Average Calculator
Mean, median, mode, sum and range.
Fraction Calculator
Add, subtract, multiply and divide fractions.
GPA Calculator
Credit-weighted GPA on the 4.0 scale.
Simple Interest Calculator
I = Prt — interest and total value.
Japanese tools
日本語ツール (Japanese Tools)
Character counter （文字数カウント）, full/half-width converter, kaomoji, Japanese calculators, age & era tables, PDF merge — a full tool hub in Japanese.
Frequently asked questions
Are DetZero tools really free?
Yes — completely free, no sign-up, no limits. They cost us nothing to run because they run on your device, not our server.
Do the tools see or store my text?
No. Each tool is JavaScript running in your browser tab. Nothing is transmitted, logged or stored. The only exception is the AI detector itself, which scores text on our server in memory and discards it immediately.
What tools are coming next?
New tools are added as they are finished — timers, calculators and date tools have already joined the original counters and generators, and anything new appears on this page when it ships.