All 173 free online tools
Every ToolStack Hub tool in one place. Filter by typing, or jump to a category.
Image Tools
Image Compressor
Compress JPG, PNG and WEBP images without visible quality loss.
↔Image Resizer
Resize images to exact pixel dimensions or a percentage.
J→PJPG to PNG Converter
Convert JPG images to PNG online, free and private.
P→JPNG to JPG Converter
Convert PNG images to JPG online, free and private.
W→PWEBP to PNG Converter
Convert WEBP images to PNG online, free and private.
W→JWEBP to JPG Converter
Convert WEBP images to JPG online, free and private.
J→WJPG to WEBP Converter
Convert JPG images to WEBP online, free and private.
P→WPNG to WEBP Converter
Convert PNG images to WEBP online, free and private.
Im→Image to Base64 Converter
Convert an image to a Base64 data URI for CSS and HTML.
→ImBase64 to Image Converter
Decode a Base64 string or data URI back into an image.
⟳Rotate & Flip Image
Rotate an image 90, 180 or 270 degrees or flip it.
◑Black & White Image Converter
Turn a colour photo into black and white or sepia.
icoFavicon Generator
Create favicon PNGs in every size from one image.
QRQR Code Generator
Create free QR codes for links, text, Wi-Fi and contact details.
◉Colour Picker from Image
Click anywhere on a picture to get its HEX and RGB colour.
PDF Tools
Merge PDF Files
Combine multiple PDFs into one document, privately in your browser.
PDF÷Split PDF / Extract Pages
Extract chosen pages from a PDF into a new file.
Im→PDFImages to PDF Converter
Convert JPG, PNG and WEBP images into one PDF.
PDF⟳Rotate PDF Pages
Rotate every page of a PDF by 90, 180 or 270 degrees.
Text Tools
Word Counter
Count words, characters, sentences, paragraphs and reading time as you type.
#Character Counter
Check text length against X, Instagram, SMS, meta title and meta description limits.
aACase Converter
Convert text to UPPER, lower, Title, Sentence, camelCase, snake_case and more.
≠Remove Duplicate Lines
Delete repeated lines from a list and keep only unique entries.
A↓Sort Lines Alphabetically
Sort a list A to Z, Z to A, by length or numerically.
⇄Reverse Text
Reverse the characters, words or lines of any text.
LiLorem Ipsum Generator
Generate placeholder paragraphs, sentences or words for mock-ups.
/-URL Slug Generator
Turn any title into a clean, SEO-friendly URL slug.
f→rFind and Replace Text
Bulk find and replace in text with optional regex and case matching.
␣Remove Extra Spaces
Strip double spaces, tabs and blank lines from text.
±Text Diff Checker
Compare two texts side by side and highlight what changed.
n×Word Frequency Counter
Find the most repeated words in any text.
1.Add Line Numbers to Text
Prefix every line of text with a line number.
@Email & URL Extractor
Pull email addresses, links or numbers out of messy text.
01Text to Binary Converter
Convert text to binary, hex or decimal codes and back.
·–Morse Code Translator
Translate text to Morse code and Morse code to text.
𝓐Fancy Text Generator
Create bold, italic, script and bubble text for bios and posts.
RdReadability Score Checker
Get the Flesch reading ease score and grade level for your writing.
▶Text to Speech Reader
Listen to any text read aloud using your device voices.
NpOnline Notepad
A private notepad that autosaves in your browser.
Developer Tools
JSON Formatter & Validator
Format, beautify, validate and minify JSON with clear error messages.
{ }JSON Minifier
Compress JSON by removing whitespace and line breaks.
→,JSON to CSV Converter
Convert a JSON array of objects into CSV for Excel or Google Sheets.
,→CSV to JSON Converter
Convert CSV or spreadsheet data into JSON.
B64Base64 Encode & Decode
Encode text to Base64 or decode Base64 back to text, with UTF-8 support.
%20URL Encoder & Decoder
Percent-encode or decode URLs and query string values.
&;HTML Entity Encoder & Decoder
Escape or unescape HTML special characters.
.*Regex Tester
Test regular expressions live with match highlighting and capture groups.
IDUUID Generator
Generate random v4 UUIDs in bulk.
#!Hash Generator (SHA-256, SHA-1, SHA-512)
Create SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text.
JWTJWT Decoder
Decode JSON Web Tokens to inspect header, payload and expiry.
tsUnix Timestamp Converter
Convert Unix epoch time to a readable date and back.
* *Cron Expression Explainer
Translate cron schedules into plain English.
</>XML Formatter
Pretty-print and validate XML.
SQLSQL Formatter
Beautify SQL queries with line breaks and indentation.
MDMarkdown to HTML Converter
Convert Markdown to clean HTML with a live preview.
CSSCSS Minifier
Minify CSS to cut file size and speed up your site.
HTMHTML Minifier
Shrink HTML by stripping comments and extra whitespace.
◐Color Converter (HEX, RGB, HSL)
Convert colours between HEX, RGB and HSL with a live swatch.
▤CSS Gradient Generator
Build linear and radial CSS gradients and copy the code.
▣CSS Box Shadow Generator
Design CSS box shadows visually and copy the code.
://URL Parser
Break a URL into protocol, host, path, query parameters and hash.
0xNumber Base Converter
Convert numbers between binary, octal, decimal and hexadecimal.
404HTTP Status Codes Reference
Look up what any HTTP status code means.
▭Screen Resolution Checker
See your screen size, viewport, pixel ratio and browser details.
Finance & UK Tax Calculators
VAT Calculator (UK)
Add or remove UK VAT at 20%, 5% or 0% in one step.
£netUK Take-Home Pay Calculator
Estimate income tax, National Insurance and take-home pay for 2026/27.
SDLTStamp Duty Calculator (SDLT)
Calculate stamp duty land tax for homes in England and Northern Ireland.
MtgMortgage Calculator (UK)
Estimate monthly mortgage repayments and total interest.
LnLoan Repayment Calculator
Work out monthly payments and total interest on any loan.
CICompound Interest Calculator
See how savings and investments grow with compound interest.
SvSavings Goal Calculator
Find how much to save each month to reach a target.
£/hSalary to Hourly Wage Calculator
Convert an annual salary to hourly, daily, weekly and monthly pay.
h/£Hourly Wage to Salary Calculator
Convert an hourly rate into an annual salary.
PmProfit Margin & Markup Calculator
Calculate gross margin, markup and profit from cost and price.
ROIROI Calculator
Calculate return on investment and annualised return.
INVFree Invoice Generator
Create a professional invoice and save it as a PDF using print.
Mtg+Mortgage Overpayment Calculator
See how much interest and time you save by overpaying your mortgage.
Calculators
Percentage Calculator
Find percentages, percentage change and what percent one number is of another.
-%Discount Calculator
Work out the sale price and amount saved after a discount.
BMIBMI Calculator
Calculate body mass index with metric or imperial units.
kcalCalorie Calculator (TDEE)
Estimate daily calories to maintain, lose or gain weight.
x̄Average Calculator (Mean, Median, Mode)
Find the mean, median, mode, range and sum of a set of numbers.
TipTip & Bill Split Calculator
Calculate the tip and split a bill between friends.
mpgFuel Cost & MPG Calculator
Estimate the fuel cost of a journey in miles and pence per litre.
16:9Aspect Ratio Calculator
Find an aspect ratio or scale dimensions while keeping proportions.
+%Percentage Increase Calculator
Work out the percentage increase or decrease between two numbers.
Unit & Number Converters
Number to Words Converter
Write numbers in words, useful for cheques and legal documents.
XIVRoman Numeral Converter
Convert numbers to Roman numerals and back.
m↔ftLength Converter
Convert between miles, kilometres, feet, inches, metres and more.
kg↔lbWeight Converter
Convert kilograms, pounds, stone, ounces and grams.
°CTemperature Converter
Convert Celsius, Fahrenheit and Kelvin.
LVolume Converter
Convert litres, UK and US gallons, pints, cups and millilitres.
mphSpeed Converter
Convert mph, km/h, m/s and knots.
m²Area Converter
Convert square metres, square feet, acres and hectares.
GBData Storage Converter
Convert bytes, KB, MB, GB and TB.
sTime Unit Converter
Convert seconds, minutes, hours, days, weeks and years.
Date & Time Tools
Age Calculator
Calculate exact age in years, months and days from a date of birth.
ΔdDate Difference Calculator
Count the days, weeks and months between two dates.
+dAdd or Subtract Days from a Date
Find the date that is a number of days, weeks or months away.
TZTime Zone Converter
Convert a time between London, New York, Sydney and other cities.
WkWeek Number Calculator
Find the ISO week number and day of the year for any date.
⏱Online Countdown Timer
Set a countdown timer with an alarm sound.
00:Online Stopwatch
A precise stopwatch with lap times.
25Pomodoro Timer
Focus in 25-minute sprints with timed breaks.
SEO & Marketing Tools
Meta Tag Generator
Generate SEO title, description, robots and viewport meta tags.
OGOpen Graph & Twitter Card Generator
Create Open Graph and X (Twitter) card tags for rich link previews.
botRobots.txt Generator
Build a robots.txt file with sitemap and AI crawler rules.
xmlXML Sitemap Generator
Turn a list of URLs into a valid sitemap.xml.
utmUTM Link Builder
Add UTM campaign parameters to links for Google Analytics.
kw%Keyword Density Checker
Measure how often keywords and phrases appear in your content.
GGoogle SERP Snippet Preview
Preview how your title and description look in Google results.
FAQFAQ Schema (JSON-LD) Generator
Create FAQPage structured data for rich results.
301.htaccess Redirect Generator
Create 301 redirect rules and force HTTPS or www in .htaccess.
waWhatsApp Link Generator
Create a click-to-chat WhatsApp link with a prefilled message.
LBLocal Business Schema Generator
Generate LocalBusiness JSON-LD markup for Google.
altImage Alt Text Generator
Generate descriptive alt text for any image to improve accessibility and SEO.
301Redirect Checker
Trace every redirect hop for a URL and see status codes and the final destination.
relCanonical URL & SEO Page Checker
Check a page's canonical tag, robots directives, title, description and headings.
metaMeta Description Generator
Create meta description options under 155 characters from your page details.
Salary & Take-Home Pay Calculators by Country
US Salary Calculator
Estimate US take-home pay after federal tax, FICA and state tax for 2026.
C$Canada Salary Calculator
Estimate Canadian take-home pay after federal and provincial tax, CPP and EI for 2026.
A$Australia Salary Calculator
Estimate Australian take-home pay after income tax and Medicare levy for 2026-27.
€netIreland Salary Calculator
Estimate Irish take-home pay after income tax, USC and PRSI for 2026.
DE€Germany Salary Calculator
Estimate German net pay (Brutto-Netto) after tax and social insurance for 2026.
FR€France Salary Calculator
Estimate French net salary after social charges and income tax for 2026.
ES€Spain Salary Calculator
Estimate Spanish net salary after IRPF income tax and Social Security for 2026.
₹netIndia Salary Calculator
Estimate Indian in-hand salary after income tax under the new regime for FY 2026-27.
S$Singapore Salary Calculator
Estimate Singapore take-home pay after income tax and CPF for 2026.
R netSouth Africa Salary Calculator
Estimate South African take-home pay after PAYE and UIF for 2026/27.
NZ$New Zealand Salary Calculator
Estimate New Zealand take-home pay after PAYE, ACC and KiwiSaver for 2026-27.
VAT, GST & Sales Tax Calculators by Country
Ireland VAT Calculator
Add or remove Ireland VAT with current standard and reduced rates.
DE%Germany VAT Calculator
Add or remove Germany VAT with current standard and reduced rates.
FR%France VAT Calculator
Add or remove France VAT with current standard and reduced rates.
ES%Spain VAT Calculator
Add or remove Spain VAT with current standard and reduced rates.
IT%Italy VAT Calculator
Add or remove Italy VAT with current standard and reduced rates.
NL%Netherlands VAT Calculator
Add or remove Netherlands VAT with current standard and reduced rates.
BE%Belgium VAT Calculator
Add or remove Belgium VAT with current standard and reduced rates.
AT%Austria VAT Calculator
Add or remove Austria VAT with current standard and reduced rates.
PT%Portugal VAT Calculator
Add or remove Portugal VAT with current standard and reduced rates.
SE%Sweden VAT Calculator
Add or remove Sweden VAT with current standard and reduced rates.
DK%Denmark VAT Calculator
Add or remove Denmark VAT with current standard and reduced rates.
FI%Finland VAT Calculator
Add or remove Finland VAT with current standard and reduced rates.
PL%Poland VAT Calculator
Add or remove Poland VAT with current standard and reduced rates.
NO%Norway VAT Calculator
Add or remove Norway VAT with current standard and reduced rates.
CH%Switzerland VAT Calculator
Add or remove Switzerland VAT with current standard and reduced rates.
AU%Australia GST Calculator
Add or remove Australia GST with current standard and reduced rates.
NZ%New Zealand GST Calculator
Add or remove New Zealand GST with current standard and reduced rates.
CA%Canada GST / HST Calculator
Add or remove Canada GST / HST / PST with current standard and reduced rates.
IN%India GST Calculator
Add or remove India GST with current standard and reduced rates.
SG%Singapore GST Calculator
Add or remove Singapore GST with current standard and reduced rates.
AE%UAE VAT Calculator
Add or remove UAE VAT with current standard and reduced rates.
SA%Saudi Arabia VAT Calculator
Add or remove Saudi Arabia VAT with current standard and reduced rates.
ZA%South Africa VAT Calculator
Add or remove South Africa VAT with current standard and reduced rates.
JP%Japan Consumption Tax Calculator
Add or remove Japan Consumption Tax with current standard and reduced rates.
KR%South Korea VAT Calculator
Add or remove South Korea VAT with current standard and reduced rates.
MX%Mexico VAT Calculator
Add or remove Mexico VAT with current standard and reduced rates.
TR%Turkey VAT Calculator
Add or remove Turkey VAT with current standard and reduced rates.
NG%Nigeria VAT Calculator
Add or remove Nigeria VAT with current standard and reduced rates.
KE%Kenya VAT Calculator
Add or remove Kenya VAT with current standard and reduced rates.
PH%Philippines VAT Calculator
Add or remove Philippines VAT with current standard and reduced rates.
US%US Sales Tax Calculator
Add or remove US Sales tax with current standard and reduced rates.
Social Media & Content Tools
YouTube Title Generator
Generate click-worthy YouTube video titles from your topic and keywords.
YTdYouTube Description Generator
Create an SEO-friendly YouTube description with a strong first two lines.
IGInstagram Caption Generator
Write Instagram captions in your tone, with optional emojis and hashtags.
TTTikTok Caption Generator
Generate short, hook-first TikTok captions with trending-style hashtags.
#tagHashtag Generator
Generate relevant hashtags for Instagram, TikTok, X, LinkedIn or YouTube.
inLinkedIn Post Formatter
Format LinkedIn posts with bold text, bullets and clean line breaks.
Generators & Utilities
Random Number Generator
Generate random numbers in any range, with or without repeats.
***Strong Password Generator
Create secure random passwords using your browser's crypto engine.
Pw?Password Strength Checker
Estimate how long a password would take to crack.
?Random Name Picker
Pick a random winner or shuffle a list of names.
d20Dice Roller & Coin Flip
Roll dice (d4 to d100) or flip a coin online.
▥Colour Palette Generator
Generate harmonious colour palettes and copy the HEX codes.