Free Online Tools
Counters, timers, calculators, generators and more — every tool runs right in your browser. Nothing you type or upload ever leaves your device.
Looking for the AI Detector?
Our free AI checker for ChatGPT, GPT-5, Claude, Gemini and DeepSeek text now lives on its own app site — same checker, same honest accuracy numbers, nothing stored.
All DetZero tools
Everything on DetZero, in one list. Every tool below runs entirely in your browser: nothing is uploaded and nothing is stored. The same tools are also browsable on the Free Tools hub.
Text & Writing — 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.
Text & Writing — 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.
Text & Writing — symbols & kaomoji
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
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.
Time in New York
Current local time in New York, updated live.
Time in Los Angeles
Current local time in Los Angeles, updated live.
Time in Chicago
Current local time in Chicago, updated live.
Time in Houston
Current local time in Houston, updated live.
Time in Phoenix
Current local time in Phoenix, updated live.
Time in Colorado
Current local time in Colorado, updated live.
Time in London
Current local time in London, updated live.
Time in Tokyo
Current local time in Tokyo, updated live.
Time in Sydney
Current local time in Sydney, updated live.
Time in Toronto
Current local time in Toronto, updated live.
Dates
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.
PDF tools
Merge PDF
Combine several PDFs into one — no upload.
Split PDF
Extract a page range, or one file per page.
Compress PDF
Shrink scans and photo-heavy PDFs in the browser.
Rotate PDF
Fix sideways pages — permanently.
Delete PDF Pages
Remove pages and save a leaner file.
JPG to PDF
Turn JPG images into a single PDF.
PNG to PDF
Turn PNG images into a single PDF, losslessly.
PDF to JPG
Save each PDF page as a JPG image.
PDF to PNG
Save each PDF page as a PNG image.
Image tools
Image Compressor
Shrink JPG, PNG and WebP files.
Image Resizer
Resize images to exact pixel sizes.
WebP to PNG
Convert WebP images to PNG.
WebP to JPG
Convert WebP images to JPG.
PNG to WebP
Convert PNG images to WebP.
JPG to PNG
Convert JPG images to PNG.
PNG to JPG
Convert PNG images to JPG.
AVIF to JPG
Convert AVIF images to JPG.
AVIF to PNG
Convert AVIF images to PNG.
HEIC to JPG
Convert iPhone HEIC photos to JPG.
GIF Maker
Make an animated GIF from images.
GIF Compressor
Shrink an animated GIF.
Image to Text (OCR)
Extract text from images — in your browser.
Generators & makers
Spin the Wheel
Decide anything with a spin.
Picker Wheel
Pick a random name fairly.
Yes or No Wheel
Let the wheel answer yes or no.
Random Number Generator
Numbers in any range.
Random Letter Generator
Random letters, any count.
Random Team Generator
Split names into fair teams.
Dice Roller
Roll any dice, see the total.
Password Generator
Strong passwords, made on your device.
QR Code Generator
Turn text & links into QR codes.
Barcode Generator
CODE128, EAN-13, UPC & more.
Converters
Unit Converter
Weight, length, volume, speed, area & temperature in one tool.
Kg to Lbs
Kilograms to pounds, with formula and table.
Lbs to Kg
Pounds to kilograms, with formula and table.
Celsius to Fahrenheit
°C to °F instantly, with landmarks and a table.
Fahrenheit to Celsius
°F to °C instantly, with landmarks and a table.
Inches to Cm
Inches to centimetres — exact 2.54 factor.
Cm to Inches
Centimetres to inches — exact 2.54 factor.
Miles to Km
Miles to kilometres, with race distances.
Km to Miles
Kilometres to miles, with race distances.
Oz to Grams
Ounces to grams for recipes and parcels.
Grams to Oz
Grams to ounces for recipes and parcels.
Developer formats
Binary Converter
Decimal, binary, octal and hex at once.
Binary to Text
Translate binary code back to readable text.
Hex Converter
Text to hexadecimal bytes and back.
Base64 Converter
Encode and decode Base64 — Unicode-safe.
Roman Numeral Converter
Numbers to Roman numerals, 1–3999, and back.
A1Z26 Converter
Letters as numbers: A=1, B=2 … Z=26.
Japanese tools （日本語ツール）
Japanese Tools Hub （日本語ツール）
文字数カウント, kaomoji, Japanese calculators, age & era tables, PDF merge — 27 tools in Japanese.
Frequently asked questions
Are DetZero tools really free?
Yes. Every tool on DetZero is completely free, with no sign-up and no usage limits.
Do the tools upload my text or files?
No. The tools run entirely in your web browser. Text you type and files you open — including PDFs in the merge tool — never leave your device.
Where is the DetZero AI detector?
The AI detector now lives on its own app site at app.detzero.com — the same free checker as before, with sentence-by-sentence highlighting.
Do the tools work on phones?
Yes. Every tool works in any modern browser, on phones, tablets and computers.