All 175 tools

The complete directory, grouped by category. New tools are published every week.

Calculators (82)

Age CalculatorAge Calculator — free online tool. Counted the way a calendar counts: the leap days and month lengths are handled, so the years/months/days answer is what you would write on a form. Works on mobile and offline.
Percentage CalculatorPercentage Calculator — free online tool. This is the everyday percentage case: GST on a price, a tip, a discount, a salary hike. Works on mobile and offline.
EMI CalculatorEMI Calculator — free online tool. The EMI is fixed for the whole tenure. Works on mobile and offline.
GST CalculatorGST Calculator — free online tool. Use Add GST when you know the pre-tax price, and Remove GST when the bill already includes tax — the two directions give different answers, which is the most common GST arithmetic mistake. Works on mobile and offline.
SIP CalculatorSIP Calculator — free online tool. The result depends entirely on how long you stay invested, not on timing the market. Works on mobile and offline.
BMI CalculatorCalculate your BMI using your weight and height. Understand your weight category: underweight, normal, overweight, or obese.
Date Difference CalculatorFind the difference between two dates. This calculator provides the total days, and the breakdown in years, months, and days.
Discount CalculatorUse this free discount calculator to find the final price of an item after a discount. Enter the original price and the discount percentage.
Simple Interest CalculatorCalculate simple interest. Enter principal, annual interest rate, and time in years to find interest and total amount.
Compound Interest CalculatorCompound Interest Calculator — free online tool. Interest on interest is the whole story here. Works on mobile and offline.
Loan Eligibility CalculatorLoan Eligibility Calculator — free online tool. Lenders use the FOIR rule: total EMIs should stay under about half of your monthly income. Works on mobile and offline.
Random Number GeneratorRandom Number Generator — free online tool. Both the minimum and maximum can come up, and every whole number between them is equally likely. Works on mobile and offline.
Fuel Cost CalculatorFuel Cost Calculator — free online tool. Real-world mileage is usually 10–15% lower than the claimed figure, especially in city traffic with the air-conditioner on. Works on mobile and offline.
Tip CalculatorTip Calculator — free online tool. Splitting happens after the tip is added, and the per-person figure already includes both. Works on mobile and offline.
Days Until CalculatorDays Until Calculator — free online tool. Both dates are normalised to midnight, so the answer does not shift depending on what time of day you check. Works on mobile and offline.
Percentage Difference CalculatorPercentage Difference Calculator — free online tool. Percentage difference compares two values with neither treated as the starting point, and it is not the same as percentage change. Works on mobile and offline.
Aspect Ratio CalculatorAspect Ratio Calculator — free online tool. Enter either dimension to get the matching one without distortion. Works on mobile and offline.
Sales Tax CalculatorSales Tax Calculator — free online tool. Use it for VAT, sales tax, service tax or a state-level cess. Works on mobile and offline.
FD CalculatorFD Calculator — free online tool. Quarterly compounding pays noticeably more than yearly on the same rate. Works on mobile and offline.
PPF CalculatorPPF Calculator — free online tool. PPF is compounded annually and the interest is tax-free under EEE. Works on mobile and offline.
Lumpsum CalculatorLumpsum Calculator — free online tool. A lumpsum grows on the whole amount from day one, so it beats a staggered monthly plan when markets rise steadily. Works on mobile and offline.
SWP CalculatorSWP Calculator — free online tool. A SWP survives when the withdrawal rate stays below the return rate: ₹30,000/month from ₹50L needs only 7. Works on mobile and offline.
Gratuity CalculatorGratuity Calculator — free online tool. Gratuity needs at least five years of continuous service, and the statutory exemption stops at ₹20 lakh. Works on mobile and offline.
HRA Exemption CalculatorHRA Exemption Calculator — free online tool. HRA exemption only applies under the old tax regime. Works on mobile and offline.
Income Tax CalculatorIncome Tax Calculator — free online tool. Both regimes are computed so you can compare — the cheaper one depends almost entirely on how large your deductions are. Works on mobile and offline.
Salary In-Hand CalculatorSalary In-Hand Calculator — free online tool. The gap between CTC and in-hand comes from PF, gratuity, insurance and the variable part that is not guaranteed. Works on mobile and offline.
Home Loan EMI CalculatorHome Loan EMI Calculator — free online tool. The EMI is fixed for the whole tenure. Works on mobile and offline.
GST Calculator Reverse ChargeGST Calculator Reverse Charge — free online tool. Use Add GST when you know the pre-tax price, and Remove GST when the bill already includes tax — the two directions give different answers, which is the most common GST arithmetic mistake. Works on mobile and offline.
PAN Card ValidatorPAN Card Validator — free online tool. The validator reads the structure rather than a government database, so a format-valid PAN may still be cancelled or inactive. Works on mobile and offline.
What is X Percent of YWhat is X Percent of Y — free online tool. This is the everyday percentage case: GST on a price, a tip, a discount, a salary hike. Works on mobile and offline.
Aadhaar Number ValidatorAadhaar Number Validator — free online tool. The checksum catches the common mistakes — a mistyped digit or two swapped digits — without any database lookup. Works on mobile and offline.
GSTIN ValidatorGSTIN Validator — free online tool. The last character is a checksum computed from the other fourteen, so a single mistyped character is caught immediately. Works on mobile and offline.
IFSC Code ValidatorIFSC Code Validator — free online tool. Format validation catches the everyday errors: a missing 0 in the middle, a lowercase letter, or a swapped branch code. Works on mobile and offline.
Indian Mobile Number ValidatorIndian Mobile Number Validator — free online tool. Numbers starting 1–5 are landlines or special services, which is the most common fake-number giveaway in forms. Works on mobile and offline.
PIN Code ValidatorPIN Code Validator — free online tool. The first digit alone narrows the address to a region — 1 for Delhi–Punjab, 4 for Maharashtra, 6 for Tamil Nadu–Kerala. Works on mobile and offline.
Vehicle Number ValidatorVehicle Number Validator — free online tool. The decoder reads which state and RTO office issued the plate. Works on mobile and offline.
Land Area Converter (India)Land Area Converter (India) — free online tool. Land units are genuinely regional in India: a bigha in Bihar is roughly half of the pucca bigha used here, and parts of Bengal use a smaller one again. Works on mobile and offline.
Numerology Number CalculatorNumerology Number Calculator — free online tool. This is the classic Pythagorean system used by most numerology charts. Works on mobile and offline.
UPI Payment Link GeneratorUPI Payment Link Generator — free online tool. The link is a web standard that any UPI app — GPay, PhonePe, Paytm, BHIM — understands. Works on mobile and offline.
IMEI ValidatorIMEI Validator — free online tool. The Luhn check catches every single-digit typo and most transpositions. Works on mobile and offline.
Number to WordsNumber to Words — free online tool. The two systems group digits differently, which is why 1,50,00,000 and 15,000,000 are the same number written two ways. Works on mobile and offline.
Event Countdown CalculatorEvent Countdown Calculator — free online tool. The countdown is calendar-accurate across months and leap years. Works on mobile and offline.
Income Tax Calculator New RegimeIncome Tax Calculator New Regime — free online tool. Both regimes are computed so you can compare — the cheaper one depends almost entirely on how large your deductions are. Works on mobile and offline.
Age Calculator in MonthsAge Calculator in Months — free online tool. Counted the way a calendar counts: the leap days and month lengths are handled, so the years/months/days answer is what you would write on a form. Works on mobile and offline.
BMR CalculatorBMR Calculator — free online tool. BMR is the energy you would burn lying still all day. Works on mobile and offline.
Percentage to Marks CalculatorPercentage to Marks Calculator — free online tool. This is the everyday percentage case: GST on a price, a tip, a discount, a salary hike. Works on mobile and offline.
GST Number CheckerGST Number Checker — free online tool. The last character is a checksum computed from the other fourteen, so a single mistyped character is caught immediately. Works on mobile and offline.
Instagram Engagement Rate CalculatorCalculate your Instagram engagement rate. Input likes, comments, shares, and followers to get your post's performance.
Affiliate Commission CalculatorAffiliate Commission Calculator — free online tool. This is the everyday percentage case: GST on a price, a tip, a discount, a salary hike. Works on mobile and offline.
Car Loan EMI CalculatorCar Loan EMI Calculator — free online tool. The EMI is fixed for the whole tenure. Works on mobile and offline.
GST Inclusive CalculatorGST Inclusive Calculator — free online tool. Use Add GST when you know the pre-tax price, and Remove GST when the bill already includes tax — the two directions give different answers, which is the most common GST arithmetic mistake. Works on mobile and offline.
Income Tax Calculator Old RegimeIncome Tax Calculator Old Regime — free online tool. Both regimes are computed so you can compare — the cheaper one depends almost entirely on how large your deductions are. Works on mobile and offline.
X is What Percent of YX is What Percent of Y — free online tool. Use this when you know the two numbers and want the ratio as a percentage — test scores, conversion rates, what share of revenue a product brings in. Works on mobile and offline.
Age Difference CalculatorAge Difference Calculator — free online tool. Counted the way a calendar counts: the leap days and month lengths are handled, so the years/months/days answer is what you would write on a form. Works on mobile and offline.
BMR Calculator FemaleBMR Calculator Female — free online tool. BMR is the energy you would burn lying still all day. Works on mobile and offline.
Test Score CalculatorTest Score Calculator — free online tool. Use this when you know the two numbers and want the ratio as a percentage — test scores, conversion rates, what share of revenue a product brings in. Works on mobile and offline.
YouTube Money CalculatorCalculate your potential YouTube ad revenue. Input monthly views, CPM, monetized playback share, and your revenue share.
Image Aspect Ratio ResizerImage Aspect Ratio Resizer — free online tool. Enter either dimension to get the matching one without distortion. Works on mobile and offline.
Content Freshness CalculatorContent Freshness Calculator — free online tool. Both dates are normalised to midnight, so the answer does not shift depending on what time of day you check. Works on mobile and offline.
Personal Loan EMI CalculatorPersonal Loan EMI Calculator — free online tool. The EMI is fixed for the whole tenure. Works on mobile and offline.
GST Calculator 5 PercentGST Calculator 5 Percent — free online tool. Use Add GST when you know the pre-tax price, and Remove GST when the bill already includes tax — the two directions give different answers, which is the most common GST arithmetic mistake. Works on mobile and offline.
Percentage Increase CalculatorPercentage Increase Calculator — free online tool. The base is always the old value, so a rise and a following fall of the same percent do not cancel out. Works on mobile and offline.
Age Calculator by Date of BirthAge Calculator by Date of Birth — free online tool. Counted the way a calendar counts: the leap days and month lengths are handled, so the years/months/days answer is what you would write on a form. Works on mobile and offline.
Ideal Weight CalculatorIdeal Weight Calculator — free online tool. The Devine formula gives a single reference number for drug dosing and clinical use, so it is narrow by design. Works on mobile and offline.
Cut Off Mark CalculatorCut Off Mark Calculator — free online tool. This is the everyday percentage case: GST on a price, a tip, a discount, a salary hike. Works on mobile and offline.
HSL to HEX ConverterHSL to HEX Converter — free online tool. Fast, private, no signup. Works on mobile and offline.
Screen Resolution CalculatorCalculate screen resolution. Find aspect ratio or new width/height from original dimensions. Maintain aspect ratio for scaling.
Print Size CalculatorPrint Size Calculator — free online tool. The same 1920 px image is a sharp 6×4-inch print at 300 DPI and a blurry A3 poster. Works on mobile and offline.
Two Wheeler Loan EMI CalculatorCalculate your bike loan EMI. Enter the loan amount, interest rate, and tenure to get your monthly payment, total interest, and total amount payable.
IGST CalculatorIGST Calculator — free online tool. Use Add GST when you know the pre-tax price, and Remove GST when the bill already includes tax — the two directions give different answers, which is the most common GST arithmetic mistake. Works on mobile and offline.
CMYK to RGB ConverterCMYK to RGB Converter — free online tool. Fast, private, no signup. Works on mobile and offline.
Percentage Change CalculatorPercentage Change Calculator — free online tool. The base is always the old value, so a rise and a following fall of the same percent do not cancel out. Works on mobile and offline.
Date Calculator Add DaysDate Calculator Add Days — free online tool. Adding days is calendar-aware, so month ends and leap years just work — 2026-01-31 plus 30 days lands on 2026-03-02. Works on mobile and offline.
Days Between Two DatesDays Between Two Dates — free online tool. Returns both the calendar breakdown and the raw day count. Works on mobile and offline.
Water Intake CalculatorDetermine your daily water intake. This calculator uses your weight and activity level to estimate how much water you need.
Graduation Percentage CalculatorCalculate your graduation percentage. Enter the marks you obtained and the total maximum marks to find your percentage.
Pomodoro Schedule Planner
Study Session PlannerStudy Session Planner — free online tool. Fast, private, no signup. Works on mobile and offline.
Work Hours and Pay CalculatorWork Hours and Pay Calculator — free online tool. Fast, private, no signup. Works on mobile and offline.
Shift Pay CalculatorShift Pay Calculator — free online tool. Fast, private, no signup. Works on mobile and offline.
Nap PlannerNap Planner — free online tool. Fast, private, no signup. Works on mobile and offline.
Coffee Nap PlannerCoffee Nap Planner — free online tool. Fast, private, no signup. Works on mobile and offline.

Converters (20)

Unit ConverterThis Unit Converter tool converts values across various units. Select your category, input a value, and choose your from and to units.
Epoch ConverterEpoch Converter — free online tool. Unix time is timezone-free: the same number is the same instant everywhere on Earth. Works on mobile and offline.
Base64 EncoderBase64 Encoder — free online tool. Base64 makes data safe for text-only channels like email headers and JSON; it is encoding, not encryption, and anyone can reverse it. Works on mobile and offline.
URL EncoderURL Encoder — free online tool. Encode individual values, not a whole URL — slashes and question marks are separators and must stay literal. Works on mobile and offline.
Celsius to FahrenheitCelsius to Fahrenheit — free online tool. Fast, private, no signup. Works on mobile and offline.
KG to PoundsKG to Pounds — free online tool. Fast, private, no signup. Works on mobile and offline.
CM to InchesCM to Inches — free online tool. Fast, private, no signup. Works on mobile and offline.
Time Zone ConverterTime Zone Converter — free online tool. Offsets are read from your browser’s own timezone database, so daylight-saving changes are handled for the date you entered — not for today. Works on mobile and offline.
Roman Numerals ConverterRoman Numerals Converter — free online tool. Only I, V, X, L, C, D and M are used, and a smaller symbol before a larger one subtracts (IV is 4, not 6). Works on mobile and offline.
Binary to Text ConverterBinary to Text Converter — free online tool. Text is converted through UTF-8 first, so accented characters and emoji take more than one byte and each byte becomes its own eight-digit group. Works on mobile and offline.
HEX to RGB ConverterHEX to RGB Converter — free online tool. FF is 255 and 00 is 0, so #000000 is black and #FFFFFF is white. Works on mobile and offline.
Kilometer to Mile ConverterKilometer to Mile Converter — free online tool. Fast, private, no signup. Works on mobile and offline.
Unix Timestamp MillisecondsUnix Timestamp Milliseconds — free online tool. Unix time is timezone-free: the same number is the same instant everywhere on Earth. Works on mobile and offline.
RGB to HEX ConverterRGB to HEX Converter — free online tool. FF is 255 and 00 is 0, so #000000 is black and #FFFFFF is white. Works on mobile and offline.
Mile to Kilometer ConverterMile to Kilometer Converter — free online tool. Fast, private, no signup. Works on mobile and offline.
ISO Date ConverterISO Date Converter — free online tool. Unix time is timezone-free: the same number is the same instant everywhere on Earth. Works on mobile and offline.
Meter to Foot ConverterMeter to Foot Converter — free online tool. Fast, private, no signup. Works on mobile and offline.
Centimeter to Inch ConverterConvert centimeters to inches or inches to centimeters. Enter your value, select units, and get instant results. Accurate and free.
PNG to JPG Converter
JPG to WebP ConverterJPG to WebP Converter — free online tool. Fast, private, no signup. Works on mobile and offline.

Formatters (10)

Case ConverterThis online case converter tool transforms your text to uppercase, lowercase, title case, or sentence case. Paste your text and convert.
JSON FormatterThis JSON Formatter tool helps you pretty-print JSON data. It indents and structures your JSON for better readability and debugging.
Text CleanerText Cleaner — free online tool. The most common source of stray spaces is copy-paste from PDFs, which insert them between words and lines. Works on mobile and offline.
Duplicate Line RemoverDuplicate Line Remover — free online tool. Matching is on the trimmed line, so trailing spaces do not create a false duplicate — but "Delhi" and "delhi" are treated as different entries. Works on mobile and offline.
Markdown PreviewMarkdown Preview — free online tool. Rendering is limited to a safe subset, and raw HTML is escaped rather than executed so pasted markup can never run scripts. Works on mobile and offline.
Uppercase ConverterUppercase Converter — free online tool. Title case capitalises the first letter of each word and lowercases the rest, which is what headlines and column names usually need. Works on mobile and offline.
Lowercase ConverterLowercase Converter — free online tool. Title case capitalises the first letter of each word and lowercases the rest, which is what headlines and column names usually need. Works on mobile and offline.
Title Case ConverterTitle Case Converter — free online tool. Title case capitalises the first letter of each word and lowercases the rest, which is what headlines and column names usually need. Works on mobile and offline.
Toggle Case ConverterToggle Case Converter — free online tool. Fast, private, no signup. Works on mobile and offline.
Capitalize WordsCapitalize Words — free online tool. Title case capitalises the first letter of each word and lowercases the rest, which is what headlines and column names usually need. Works on mobile and offline.

Generators (34)

Password GeneratorGenerate strong, random passwords. Customize password length and select character types: letters, alphanumeric, or all symbols. Free online tool.
QR Code GeneratorCreate QR codes for free. Enter text or a URL, set the size in pixels, and download your custom QR code instantly.
UUID GeneratorUUID Generator — free online tool. UUID v4 is random rather than sequential, so it does not reveal creation order or machine identity, and collision odds are negligible for any realistic dataset. Works on mobile and offline.
Slug GeneratorSlug Generator — free online tool. Slugs should stay short, use hyphens instead of underscores, and drop stop words where possible. Works on mobile and offline.
Lorem Ipsum GeneratorLorem Ipsum Generator — free online tool. Placeholder text should look like real prose so you can judge line lengths, leading and text-wrap behaviour. Works on mobile and offline.
Text to PDFConvert text to PDF online. Choose page size and font size. Upload a text file or paste text directly into the converter.
JPG to PDFJPG to PDF — free online tool. Because the JPEG data is copied verbatim into the PDF container, image quality is bit-for-bit identical to your originals. Works on mobile and offline.
Image ResizerImage Resizer — free online tool. Aspect ratio is always preserved — the image fits inside the box you give it without stretching. Works on mobile and offline.
Strong Password GeneratorStrong Password Generator — free online tool. Length matters more than symbol variety: every extra character multiplies the search space. Works on mobile and offline.
PDF Merge
Add Page Numbers to PDFAdd Page Numbers to PDF — free online tool. Fast, private, no signup. Works on mobile and offline.
Sign PDFSign PDF — free online tool. Fast, private, no signup. Works on mobile and offline.
PDF Split
PDF WatermarkPDF Watermark — free online tool. Fast, private, no signup. Works on mobile and offline.
Signature PadSignature Pad — free online tool. Fast, private, no signup. Works on mobile and offline.
Passphrase GeneratorPassphrase Generator — free online tool. Fast, private, no signup. Works on mobile and offline.
Numeric Password GeneratorNumeric Password Generator — free online tool. Length matters more than symbol variety: every extra character multiplies the search space. Works on mobile and offline.
Instagram Bio GeneratorInstagram Bio Generator — free online tool. Fast, private, no signup. Works on mobile and offline.
PDF Rotate
PDF CompressPDF Compress — free online tool. Fast, private, no signup. Works on mobile and offline.
Memorable Password GeneratorMemorable Password Generator — free online tool. Fast, private, no signup. Works on mobile and offline.
UUID v4 GeneratorGenerate random UUIDs (version 4) instantly. This tool creates unique 128-bit identifiers for your applications and databases.
PDF Delete Pages
Images to PDFImages to PDF — free online tool. Fast, private, no signup. Works on mobile and offline.
PDF Page CounterPDF Page Counter — free online tool. Fast, private, no signup. Works on mobile and offline.
PDF Extract PagesPDF Extract Pages — free online tool. Fast, private, no signup. Works on mobile and offline.
Title Tag GeneratorCreate optimized title tags for your web pages. Enter your page topic, primary keywords, and brand name to get a suitable title.
Image Compressor
4 Digit PIN Generator4 Digit PIN Generator — free online tool. Fast, private, no signup. Works on mobile and offline.
QR Code for URLQR Code for URL — free online tool. The pattern is generated in your browser and drawn to a canvas — nothing is uploaded. Works on mobile and offline.
URL Slug from TitleURL Slug from Title — free online tool. Slugs should stay short, use hyphens instead of underscores, and drop stop words where possible. Works on mobile and offline.
Image to WebPImage to WebP — free online tool. Fast, private, no signup. Works on mobile and offline.
Placeholder Image Generator
OG Image Placeholder GeneratorOG Image Placeholder Generator — free online tool. Fast, private, no signup. Works on mobile and offline.

Checkers (29)

Word CounterThis word counter tool provides counts for words, characters, sentences, lines, and paragraphs. Paste your text to get instant statistics.
Character CounterCharacter Counter — free online tool. Both totals are shown because the rules differ: some platforms count spaces, others do not. Works on mobile and offline.
Regex TesterRegex Tester — free online tool. The pattern is compiled by the browser’s own engine, so the result matches what JavaScript will do in your code. Works on mobile and offline.
GPA CalculatorGPA Calculator — free online tool. Credit-weighting is where self-calculations go wrong: an A in a 4-credit course pulls twice as hard as an A in a 2-credit lab. Works on mobile and offline.
Word Counter for EssaysWord Counter for Essays — free online tool. Counts update as you type. Works on mobile and offline.
Email ValidatorEmail Validator — free online tool. Fast, private, no signup. Works on mobile and offline.
Cron Expression BuilderCron Expression Builder — free online tool. The five-field order is the part everyone mixes up — minutes first, weekdays last. Works on mobile and offline.
Instagram Font GeneratorInstagram Font Generator — free online tool. Fast, private, no signup. Works on mobile and offline.
Hashtag CounterHashtag Counter — free online tool. Both totals are shown because the rules differ: some platforms count spaces, others do not. Works on mobile and offline.
Keyword Density Checker ProThe Keyword Density Checker Pro analyzes text to show the percentage of a specific word or phrase. Use it to refine your writing.
SGPA CalculatorSGPA Calculator — free online tool. Credit-weighting is where self-calculations go wrong: an A in a 4-credit course pulls twice as hard as an A in a 2-credit lab. Works on mobile and offline.
Character Counter with SpacesCharacter Counter with Spaces — free online tool. Both totals are shown because the rules differ: some platforms count spaces, others do not. Works on mobile and offline.
Bulk Email ValidatorBulk Email Validator — free online tool. Fast, private, no signup. Works on mobile and offline.
Regex Tester OnlineRegex Tester Online — free online tool. The pattern is compiled by the browser’s own engine, so the result matches what JavaScript will do in your code. Works on mobile and offline.
Crontab GeneratorCrontab Generator — free online tool. The five-field order is the part everyone mixes up — minutes first, weekdays last. Works on mobile and offline.
HEX to HSL ConverterHEX to HSL Converter — free online tool. Fast, private, no signup. Works on mobile and offline.
Twitter Character Limit CheckerTwitter Character Limit Checker — free online tool. Both totals are shown because the rules differ: some platforms count spaces, others do not. Works on mobile and offline.
SERP Snippet Length CheckerEnsure your SERP snippets display correctly. Check character lengths for meta titles, descriptions, and URLs to avoid truncation on Google.
Phone Number ValidatorPhone Number Validator — free online tool. Fast, private, no signup. Works on mobile and offline.
Character Counter without SpacesCharacter Counter without Spaces — free online tool. Both totals are shown because the rules differ: some platforms count spaces, others do not. Works on mobile and offline.
Regex Match ExtractorUse this tool to extract all occurrences that match your regular expression from any text. Specify your pattern and flags.
Paragraph CounterParagraph Counter — free online tool. Fast, private, no signup. Works on mobile and offline.
Domain Name CheckerDomain Name Checker — free online tool. Fast, private, no signup. Works on mobile and offline.
Word Frequency CounterWord Frequency Counter — free online tool. Writers use the top-10 list to catch their own crutches — the same adverb appearing twenty times. Works on mobile and offline.
Twitter Character CounterTwitter Character Counter — free online tool. Both totals are shown because the rules differ: some platforms count spaces, others do not. Works on mobile and offline.
IPv4 ValidatorIPv4 Validator — free online tool. Fast, private, no signup. Works on mobile and offline.
URL Regex TesterURL Regex Tester — free online tool. The pattern is compiled by the browser’s own engine, so the result matches what JavaScript will do in your code. Works on mobile and offline.
UUID ValidatorUUID Validator — free online tool. Fast, private, no signup. Works on mobile and offline.
SQL Date Format ConverterSQL Date Format Converter — free online tool. 31/01/2026 and 01/31/2026 are the same day written in two conventions — and 03/04/2026 is ambiguous everywhere. Works on mobile and offline.