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Monu Tools

All tools

Every tool on Monu Tools, grouped by category.

Base64 Encoder

Encode text to Base64 or decode Base64 back to text. UTF-8 safe with automatic direction detection.

Bcrypt

Hash a password with bcrypt and verify a password against a bcrypt hash, entirely in your browser.

chmod Calculator

Convert Unix file permissions between checkboxes, octal (like 755) and symbolic notation (like rwxr-xr-x).

Color Converter

Convert colors between HEX, RGB and HSL with a live preview.

Color Palette

Generate a tint and shade scale plus complementary, analogous and triadic colors from a base color.

Contrast Checker

Check the contrast ratio between two colours against WCAG AA and AAA accessibility levels.

Cron Generator

Build and check cron expressions. Pick a preset or edit the five fields, and see the next run times in your time zone. Runs entirely in your browser.

CSS Formatter

Beautify CSS with clean indentation, or minify it to shrink file size. Handles media queries, calc() and license comments.

CSS Gradient

Build linear and radial CSS gradients with a live preview and copy the ready-to-use background code.

cURL to fetch

Convert a curl command into equivalent JavaScript fetch code, entirely in your browser.

ENV / JSON

Convert a .env file to JSON and JSON back to .env, in both directions, entirely in your browser.

Favicon Generator

Turn any image into a complete favicon set, the .ico, PNG sizes, Apple touch icon and a web manifest, generated in your browser.

Hash Generator

Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text, right in your browser.

HMAC

Generate an HMAC for a message and secret key using SHA-1, SHA-256, SHA-384 or SHA-512, in your browser.

HTML Encoder

Encode text to HTML entities or decode entities back to text, UTF-8 safe and client-side.

HTML Formatter

Beautify HTML with block-aware indentation, or minify it. The contents of pre, textarea, script and style are preserved.

HTTP Status

Search and look up HTTP status codes and their meanings, from 1xx to 5xx.

Image to Base64

Convert an image into a Base64 data URI for embedding in HTML, CSS or JSON, entirely in your browser.

IP Lookup

See your own IP address and look up the location, ISP and network details of any IP.

JS Formatter

Beautify and prettify JavaScript with consistent indentation and spacing. Runs entirely in your browser.

JSON / TOML

Convert JSON to TOML and TOML back to JSON, in both directions, entirely in your browser.

JSON / XML

Convert JSON to XML and XML back to JSON, in both directions, entirely in your browser.

JSON ⇄ CSV

Convert JSON to CSV and CSV back to JSON, both ways. Choose the delimiter, handle quoted fields, and copy the result. Everything runs in your browser.

JSON Formatter

Format, beautify and validate JSON online with clear error messages for invalid input.

JSON Minifier

Minify and validate JSON in your browser, and see how many bytes you save.

JSON to TS

Generate TypeScript interfaces from a JSON sample, with nested types, arrays and optional fields. Runs in your browser.

JWT Decoder

Decode a JSON Web Token to inspect its header and payload, with human-readable expiry and issue times. Runs entirely in your browser; tokens are never uploaded.

JWT Generator

Create and sign HS256 JSON Web Tokens from a payload and secret, entirely in your browser.

Meta Tags

Generate SEO and social meta tags (title, description, Open Graph, Twitter Cards) with a live search preview.

Number Base

Convert numbers between binary, octal, decimal and hexadecimal. Edit any field and the others update instantly. Large values are exact, with no rounding.

Query String

Parse a URL query string into JSON and build a query string from JSON, in your browser.

Regex Tester

Test a regular expression against your text in real time. See every match highlighted, with capture groups and flags. Runs entirely in your browser.

SQL Formatter

Format and beautify SQL queries with clause line breaks and consistent keyword casing, or minify them to a single line.

Timestamp

Convert Unix timestamps to human dates and back: UTC, local, ISO 8601 and relative time. Seconds and milliseconds are auto-detected.

URL Encoder

Percent-encode and decode URLs and URL components, UTF-8 safe.

UUID Generator

Generate 5 random RFC 4122 version 4 UUIDs at once. The input is ignored; run again for a new batch.

XML Formatter

Beautify XML with proper indentation, or minify it to a single line. Comments, CDATA and processing instructions are preserved.

YAML ⇄ JSON

Convert YAML to JSON and JSON back to YAML, both ways. Validates as it converts and shows clear errors. Everything runs in your browser.

Change delimiter

Change a file's delimiter: read CSV with one separator and write it with another, such as comma to tab (TSV) or pipe. Runs in your browser.

CSV / Excel

Convert CSV to an Excel .xlsx file and Excel back to CSV, entirely in your browser. Works in both directions.

CSV → flat file

Convert CSV into an aligned fixed-width flat file, padding each column to its widest value. Runs entirely in your browser.

CSV → GeoJSON

Convert CSV with latitude and longitude columns into a GeoJSON FeatureCollection of points. Runs entirely in your browser.

CSV → HTML

Convert CSV into a clean, semantic HTML table with a header and body, ready to paste into a page. Runs in your browser.

CSV → JSON

Convert CSV to a JSON array of objects, with types inferred. Choose the delimiter and copy the result. Runs entirely in your browser.

CSV → KML

Convert CSV with latitude and longitude columns into KML placemarks for Google Earth and Maps. Runs entirely in your browser.

CSV → Markdown

Convert CSV into a GitHub-flavored Markdown table, ready to paste into a README or issue. Runs entirely in your browser.

CSV → multi-line

Turn each CSV row into a readable block of "Header: value" lines, separated by blank lines. Runs entirely in your browser.

CSV → PDF

Convert CSV into a clean, paginated PDF table with an optional title and orientation. Generated in your browser, nothing is uploaded.

CSV → SQL

Convert CSV into SQL INSERT statements, with an optional CREATE TABLE. Set the table name and copy the script. Runs in your browser.

CSV → Word

Convert CSV into a Word document with a formatted table you can open and edit in Word, LibreOffice or Google Docs. Built in your browser, nothing uploaded.

CSV → XML

Convert CSV into XML with one element per row and a child element per column. Runs entirely in your browser.

CSV → YAML

Convert CSV into a YAML list of records, with types inferred. Pick the delimiter and copy the result. Runs entirely in your browser.

CSV Editor

Edit CSV in a spreadsheet-style grid in your browser: add or remove rows and columns, rename headers, then export clean CSV. Nothing is uploaded.

CSV escape

Escape values so they are safe CSV fields: quotes are doubled and fields with commas or line breaks are quoted. Runs in your browser.

CSV Explorer

Explore a CSV in your browser: per-column type, counts, missing and unique values, numeric statistics and a quick distribution. Nothing is uploaded.

CSV toolkit

A suite of fast, private CSV tools: convert to and from JSON, XML, YAML, SQL, Markdown and more, all in your browser.

Email extractor

Pull every email address out of any text or document, de-duplicated and lower-cased. Runs entirely in your browser.

Flat file → CSV

Convert a fixed-width or space-aligned flat file into CSV. Columns split on runs of two or more spaces. Runs in your browser.

GeoJSON → CSV

Flatten a GeoJSON FeatureCollection into CSV: feature properties become columns, with longitude and latitude added. Runs in your browser.

HTML links → CSV

Extract every link from pasted HTML into CSV of text, href and title. Runs entirely in your browser.

HTML table → CSV

Paste HTML that contains a table and get clean CSV. The cell text is extracted and quoted correctly. Runs in your browser.

JSON → CSV

Convert a JSON array of objects to CSV. The columns are the union of all keys, with proper quoting. Everything runs in your browser.

KML → CSV

Extract placemarks from a KML file into CSV of name, description, longitude and latitude. Runs entirely in your browser.

Markdown Table

Convert CSV to a Markdown table and Markdown tables back to CSV, both directions.

Phone extractor

Pull phone numbers out of any text, keeping their original formatting, de-duplicated. Runs entirely in your browser.

Pivot CSV

Build a pivot table from CSV in your browser: group by a field, spread another across columns and aggregate. Nothing is uploaded.

Query CSV (SQL)

Run SQL SELECT queries against a CSV in your browser: it loads into a table you can filter, group and join. Nothing is uploaded.

Regex extractor

Extract every match of a regular expression from text, returning any capture group you choose. Runs entirely in your browser.

Split CSV

Split a large CSV into smaller files by row count, repeating the header in each part, then download them. Runs in your browser.

SQL → CSV

Paste SQL INSERT statements and get CSV back. The column list becomes the header and each tuple a row. Runs in your browser.

SQLite Online

Run SQLite in your browser: create tables, insert data and run any SQL, then export the database file. Everything stays on your device.

Test Data

Generate realistic fake test data as CSV, JSON or SQL: names, emails, dates, numbers, UUIDs and more. Reproducible and fully client-side.

Transpose CSV

Flip a CSV so rows become columns and columns become rows. Runs entirely in your browser.

URL extractor

Pull every URL out of any text, de-duplicated and cleaned of trailing punctuation. Runs entirely in your browser.

XML → CSV

Convert repeating XML records into CSV. Each row element becomes a line and its children become columns. Runs in your browser.

YAML → CSV

Convert a YAML list of records to CSV, with the union of keys as columns. Everything runs in your browser.

Case Converter

Convert text between UPPERCASE, lowercase, Title, Sentence, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and dot.case.

Diff Checker

Compare two texts and highlight the exact lines and words that changed, instantly and in your browser.

Lorem Ipsum

Generate placeholder text by paragraphs, sentences or words, with one click.

Markdown / HTML

Convert Markdown to HTML and HTML back to Markdown, with a live preview. Works in both directions.

Morse Code

Translate text to Morse code and Morse code back to text, using the international standard.

PDF to Markdown

Extract the text from a PDF and get it as Markdown, entirely in your browser. Your file is never uploaded.

Remove Duplicates

Remove duplicate lines from a list or text, with options to ignore case, trim and sort.

Roman Numerals

Convert numbers to Roman numerals and Roman numerals back to numbers (1 to 3999).

Slug Generator

Turn any title into a clean, SEO-friendly URL slug, with German umlaut handling.

Sort Lines

Sort lines of text alphabetically, numerically or by length, with options to trim, deduplicate blanks and ignore case.

Text Reverser

Reverse text by character, word or line, or flip it upside down.

Whitespace Remover

Clean up messy whitespace: trim lines, collapse spaces, remove blank lines and line breaks.

Word Counter

Count words, characters, lines and sentences in any text.

Word to Markdown

Convert a Word .docx document to clean Markdown in your browser, preserving headings, lists and formatting.

bAV Calculator

See what a monthly bAV salary conversion (Entgeltumwandlung) costs you in net pay and how much lands in your company pension after the employer subsidy.

Brut to Net

Convert a French monthly gross salary to net in seconds. Based on the official 2026 employee contribution rates: vieillesse, Agirc-Arrco, CSG/CRDS.

BTW

Calculate Dutch BTW for 2026. Enter a net amount (excl. BTW) or a gross amount and get the full breakdown at the 21% standard rate or the 9% reduced rate.

Compound Interest

Project how savings or an ETF plan grow with compound interest. Set a starting amount, monthly contribution, return and duration, and watch the balance grow year by year.

Debt Payoff

See how fast you can be debt-free with the avalanche or snowball method, and how much interest an extra payment saves.

Elterngeld Calculator

Estimate German Elterngeld: Basiselterngeld and ElterngeldPlus, with the sibling bonus and multiple-birth bonus, based on your net income before birth.

French Income Tax

Estimate French income tax on 2025 income using the official 2026 barème, with the quotient familial (parts), plafonnement and décote.

French VAT

Calculate French TVA: enter an amount HT or TTC and get the breakdown at 20 %, 10 %, 5.5 %, or 2.1 %.

Hourly Wage

Convert between an hourly rate and weekly, monthly and yearly pay, in both directions.

Income Tax

Calculate German income tax from your taxable income using the official 2026 tariff, with the splitting tariff for couples, solidarity surcharge and church tax.

Inflation

See how the purchasing power of an amount changes between two years, using the official German consumer price index.

IRPEF Calculator

Estimate Italian IRPEF income tax for 2026 from your taxable income.

IRPF Calculator

Estimate Spanish IRPF income tax for 2026 using the combined estatal and autonomica scale. Enter your base liquidable and see cuota, tipo medio, and tipo marginal.

IVA Calculator

Calculate Spanish IVA for 2026. Enter the base (excl. IVA) or total (incl. IVA) and see the full breakdown at 21 %, 10 %, or 4 %.

IVA Italy

Calculate Italian IVA for 2026. Enter an imponibile (excl. IVA) or a gross total and get the full breakdown at 22 %, 10 %, 5 %, or 4 %.

Kfz-Steuer

Estimate the annual German motor vehicle tax (Kfz-Steuer) for cars first registered from 2021, from displacement, CO2 and fuel type.

Loan Calculator

Calculate the monthly payment, total interest and effective APR for an annuity loan or credit. Includes an optional fee and a year-by-year repayment chart.

Loan Calculator

Calculate the monthly payment, total interest and credit cost for a French mortgage or loan. Includes assurance emprunteur.

Mutterschaftsgeld Calculator

Estimate your German Mutterschaftsgeld and the employer top-up during the maternity protection period, from your average monthly net pay.

Mutterschutz Calculator

Work out your German Mutterschutz protection period: when it starts before the due date, your last working day, and when it ends after birth.

Nebenkosten Calculator

Work out your share of a building's operating costs by living area and reconcile it against your advance payments, to see a refund or back payment.

Net Salary Italy

Calculate your Italian net salary for 2026 from RAL. Includes INPS contributions, IRPEF on the imponibile, and addizionali regionale and comunale.

Net Salary Netherlands

Work out your Dutch net salary for 2026 from your gross, credits included.

Net Salary Spain

Calculate your Spanish net salary for 2026. Enter your annual gross and pay period count (12 or 14) to see take-home pay after Seguridad Social (6.5 %) and IRPF withholding.

Paycheck Calculator

Work out your US take-home pay for 2026 after federal income tax and FICA.

Pendlerpauschale

Calculate the German commuter allowance (Entfernungspauschale) from your one-way distance and number of working days.

Pension Calculator

Estimate your German statutory pension from your salary and contribution years using the official pension formula, including early or later retirement and health and care insurance.

Pension Estimator

Estimate your French state pension from your salary and quarters validated.

Poland Salary Calculator

Work out your Polish net pay from an employment contract (umowa o pracę) in 2026: ZUS, the health contribution, the PIT advance, and take-home.

Redundancy Pay

Work out your UK statutory redundancy pay for 2025/26 from age, service and weekly pay.

Rent Calculator

Add up cold rent, operating costs and heating into the warm rent, see the price per square metre, and check the rent-to-income ratio.

Salary Calculator

Calculate your German net salary with the official 2025 & 2026 payroll-tax algorithm: tax class, Bundesland, church tax, children and public or private insurance.

Sales Tax Calculator

Add US sales tax to a price or reverse it out of a total. Pick your state for its average combined rate, enter your own combined state plus local rate, or choose a common preset, and see the subtotal, the tax, and the total.

Severance Calculator

Estimate the tax on a German severance payment with the one-fifth rule (§34 EStG), and see how much that rule saves compared with normal taxation.

Severance Calculator

Calculate Spanish severance pay (indemnizacion por despido) for 2026.

Sick Pay Calculator

Estimate German statutory sick pay (Krankengeld): 70 % of your gross, capped at 90 % of net and the contribution ceiling, minus social contributions.

Skonto Calculator

Work out the Skonto cash discount on an invoice: the discount amount, the reduced amount to pay, and the effective annual interest rate of paying early.

Take-Home Pay

Work out your UK take-home pay for 2025/26 after income tax and National Insurance.

Tax Classes

Compare the German tax-class combinations III/V, IV/IV and IV/IV with factor: both partners' monthly net pay with the official 2026 wage-tax tariff, in your browser.

TFR Calculator

Calculate your Italian TFR with yearly rivalutazione from RAL and years of service.

Transitievergoeding

Calculate your Dutch transitievergoeding for 2026 from salary and years of service.

Urlaubsgeld Calculator

Work out the net of your German Urlaubsgeld (holiday bonus) after income tax and social contributions, from your monthly salary and the gross bonus.

Vacation Calculator

Work out your German statutory vacation entitlement, pro-rated for part-time working days and a partial year, under the Federal Leave Act (BUrlG).

Vakantiegeld

Calculate your Dutch vakantiegeld for 2026 and the net amount you keep.

VAT Calculator

Calculate VAT for Germany (19/7 %), Austria (20/13/10 %) and Switzerland (8.1/2.6/3.8 %), both ways: add VAT to a net amount or remove it from a gross amount.

VAT Calculator

Calculate UK VAT fast. Enter a net amount (excl. VAT) or a gross amount and get the full breakdown at the 20% standard rate, the 5% reduced rate, or the 0% zero rate.

Age Calculator

Calculate your exact age in years, months and days, plus totals and your next birthday.

Barcode

Create Code 128, EAN, UPC and more, one barcode per line, and download them as PNG, SVG, or a zip.

Blood Alcohol

Estimate your blood alcohol concentration in per mille with the Widmark formula, based on the drink, your weight and the time elapsed.

BMI Calculator

Calculate your BMI from weight and height and see your WHO category.

BMR Calculator

Estimate your basal metabolic rate and daily calories (TDEE) with three formulas.

Body Fat Calculator

Estimate your body fat percentage with the US Navy tape method or a BMI-based formula, plus your fat mass and lean mass, in metric or imperial units.

Calorie Calculator

Estimate your daily calorie needs (BMR and TDEE) from your sex, age, height, weight and activity level, with targets for losing, maintaining or gaining weight.

Code 128

Generate dense Code 128 barcodes for SKUs, serials, and logistics labels, single or in bulk, as PNG or SVG.

Counter

A simple tap counter. Count up or down with one tap, great for reps, people, stitches or inventory.

Currency Converter

Convert between 30+ currencies using daily European Central Bank reference rates.

Date Calculator

Work out the days between two dates, or add and subtract days, weeks, months and years from a date. Shows the duration, total days and the weekday.

Degree Grade Calculator

Calculate your Italian degree grade on the 110 scale from exams, CFU and thesis points.

Discount

Calculate the final price after a percentage discount, or find the discount percentage from the original and sale price.

EAN-13

Generate EAN-13 retail barcodes with the check digit computed for you, single or in bulk, as PNG or SVG.

Electricity Cost

Work out what an appliance costs to run from its power draw, daily usage and your price per kWh.

Fuel Cost

Work out the fuel cost of a trip from distance, consumption and fuel price, and split it between passengers.

Grade Calculator

Calculate your weighted grade average from German school grades (1 to 6) with custom weights.

Inch to cm

Convert inches to centimetres and back, using the exact factor of 2.54.

Industrial Minutes

Convert clock time to industrial minutes (decimal time) and back. Enter hours and minutes to get industrial minutes and decimal hours, or reverse it.

kW to PS

Convert kilowatts to metric horsepower (PS) and back, with mechanical hp kept separate.

Password Generator

Generate strong, random passwords with full control over length and character types. Everything happens in your browser.

Percentage Calculator

Work out percentages six ways, from percent of a value to percentage change.

Protein Calculator

Estimate your daily protein needs from your body weight and goal, from general health to building muscle or losing fat. Metric and imperial units.

QR Code Generator

Create a QR code from any text or URL and download it as PNG or SVG.

Random Numbers

Generate random numbers in any range, with or without duplicates, using secure randomness.

Ring Size

Convert a ring's inner circumference or diameter in mm to DE/ISO, US and UK ring sizes.

Rule of Three

Solve proportional and inverse rule-of-three problems: if A corresponds to B, what does C correspond to?

Shoe Size

Convert a foot length in cm or mm to EU, UK, US men's and US women's shoe sizes.

Time Zone Converter

Convert a time across the world's major time zones, with daylight saving handled automatically.

Timer & Stopwatch

A countdown timer and a stopwatch in one. Set hours, minutes and seconds for the timer, or track laps with the stopwatch. Includes an alarm sound.

Tip Calculator

Work out the tip and split the bill between any number of people, with optional rounding up.

Unit Converter

Convert length, weight, temperature, volume, area, speed, data and power units instantly.

Water Intake Calculator

Estimate how much water to drink each day from your body weight, exercise and climate, with the amount in liters, cups, ounces and glasses, alongside the EFSA and US health baselines.

Blur Image

Blur or pixelate faces, license plates and private details in a photo by drawing over them, entirely in your browser.

Crop Image

Crop JPG, PNG and other images by dragging a selection, entirely in your browser.

HEIC to JPG

Convert Apple HEIC and HEIF photos to JPG, entirely in your browser. No upload, no app needed.

Image Compressor

Compress JPEG, PNG and WebP images to a smaller size in your browser.

Image Converter

Convert images between JPG, PNG and WebP in your browser, with a quality control for the lossy formats.

Image Resizer

Resize images to exact dimensions in your browser and export as PNG, JPEG or WebP. Your photos never leave your device.

Image to SVG

Vectorize a raster image (PNG, JPG) into a scalable SVG by tracing it, entirely in your browser.

Meme Generator

Create a classic meme with top and bottom text on your own image, entirely in your browser.

Metadata Remover

Strip EXIF, GPS and camera metadata from photos, right in your browser.

Remove Background

Erase the background from a photo and download a transparent PNG, with the cutout computed entirely in your browser. Nothing is uploaded.

Rotate Image

Rotate and flip an image in your browser, with a live preview, and download the result.

SVG to PNG

Convert SVG vector graphics to PNG raster images at any size, entirely in your browser.

Watermark

Add a text watermark to an image, with control over size, color, opacity and position, all in your browser.

BMP to PDF

Turn BMP bitmap images into a single PDF, one image per page, right in your browser.

Compress PDF

Reduce the file size of a PDF in your browser by re-rendering its pages at a quality you choose.

HEIC to PDF

Turn HEIC and HEIF photos from your iPhone into a single PDF, one image per page, right in your browser.

Images to PDF

Combine JPG, PNG and other images into a single PDF, one image per page, entirely in your browser.

JPG to PDF

Turn JPG and JPEG photos into a single PDF, one image per page, right in your browser.

Linearize PDF

Rewrite a PDF for fast web view, so a reader can display the first page before the whole file has downloaded. Runs entirely in your browser.

Merge PDF

Combine several PDFs into one, in any order, right in your browser.

Organize PDF

Reorder and delete pages in a PDF, then save the rearranged file, entirely in your browser.

Page Numbers

Add page numbers to a PDF, with a choice of position, start number and format, entirely in your browser.

PDF Pages

Count the number of pages in a PDF and see its file size, entirely in your browser.

PDF Permissions

Choose whether a PDF may be printed, copied from or edited, and download a copy that carries those permissions. Runs entirely in your browser.

PDF to Images

Convert each page of a PDF into a PNG image, entirely in your browser. Download pages individually or all at once.

PDF to JPG

Turn every page of a PDF into a JPG image, right in your browser.

PDF to PNG

Turn every page of a PDF into a lossless PNG image, right in your browser.

PDF to WebP

Turn every page of a PDF into a WebP image, right in your browser.

PNG to PDF

Turn PNG images and screenshots into a single PDF, one image per page, right in your browser.

Protect PDF

Add a password to a PDF with strong AES-256 encryption, so only people with the password can open it. Runs entirely in your browser.

Redact PDF

Black out names, numbers and any private text in a PDF, then download a copy with the redacted content truly removed, not just hidden. Runs in your browser.

Remove Restrictions

Lift printing, copying and editing restrictions from a PDF that already opens without a password. Runs entirely in your browser.

Rotate PDF

Rotate every page of a PDF by 90, 180 or 270 degrees, entirely in your browser. Lossless and instant.

Sign PDF

Draw or type your signature, place it on the page, and download a signed PDF. Everything stays in your browser.

Split PDF

Extract specific pages or a range from a PDF into a new file, entirely in your browser.

SVG to PDF

Turn SVG vector graphics into a PDF, one image per page, right in your browser.

Unlock PDF

Remove the password from a PDF you can open, and download an unlocked copy with all content intact. Runs entirely in your browser.

WebP to PDF

Turn WebP images into a single PDF, one image per page, right in your browser.