All tools

Convert audio files locally to MP3, WAV, FLAC, OGG, M4A or Opus.

Keep only the useful part of an audio file.

Join multiple audio files in the selected order.

Reduce audio file size by choosing an output format and bitrate.

Speed up or slow down an audio file without changing pitch.

Convert an M4A file to MP3 locally in your browser.

Calculate concrete volume and the cement, sand, gravel or bags required.

Calculate paintable area, litres required and paint containers to buy.

Calculate tiles, boxes and quantities to order.

Calculate plasterboards, tracks, studs and screws for a partition or ceiling.

Estimate bricks, joints, wall volume and mortar.

Estimate bar counts, linear length, and weight for a reinforcement grid.

Convert CSV data to JSON or JSON to CSV while preserving useful structure.

Convert Excel, CSV, and other spreadsheet formats directly in your browser.

Validate CSV structure and quickly identify problematic rows or columns in your data.

Split a CSV file into smaller files using the size or groups you choose.

Merge multiple CSV files into one table while keeping columns aligned consistently.

Cross a row dimension with a column dimension, then calculate count, sum, average, minimum, or maximum.

Convert a Unix timestamp to a readable date and time, or a date to a timestamp, in seconds or milliseconds.

Calculate an exact age in years, months and days from a date of birth and any reference date.

Calculate the time between two dates in years, months and days, in total days and in weeks.

Count the business days between two dates and shift a date by a number of working days, for a Monday–Friday or other working week.

Find out how many days are left until a date, or how many have passed since, with the equivalent in weeks.

Convert a date and time from one time zone to another, daylight saving time included.

Encode text as Base64 or decode a Base64 string back to its original content.

Format, minify, and validate JSON to make it easier to read or more compact.

Generate one or more random UUID v4 identifiers instantly and copy them when needed.

Test a regular expression against text and inspect the matches it returns.

Validate a JSON document against a schema and locate every error precisely.

Build a standard cron expression, understand it and preview its next execution times.

Simulate your 2027 French Bac average, result, honours and the grades you still need.

Calculate your 2027 DNB average, result, honours and the grades you still need.

Calculate a weighted average and the next grade needed to reach your target.

Calculate your IB score out of 45 and check the main Diploma passing criteria.

Calculate UCAS points for A levels, AS levels and the EPQ.

Convert ECTS credits into study workload and track progress toward a credit target.

Simulate a loan, calculate monthly payments and total cost, and view a complete amortization schedule.

Instantly calculate net price, VAT and gross price in either direction.

Calculate ROI, net gain and the total cost of an investment.

Calculate capital growth with compound interest and regular contributions.

Estimate net pay before income tax from gross salary, or calculate gross pay from net.

Estimate how much you can borrow and the home price you may afford from income, debts, down payment, rate and term.

Estimate your basal metabolic rate in kcal and kJ, and compare the Mifflin-St Jeor, Harris-Benedict and Katch-McArdle equations.

Work out your bra size from your underbust and bust measurements, with UK, US, EU, French, Italian and Australian sizes and sister sizes.

Calculate your maximum heart rate (Tanaka, 220 − age, Gulati) and your five training zones, with the Karvonen method if you know your resting heart rate.

Calculate your body mass index from height and weight, with adult reference ranges and clearly explained limitations.

Estimate your total daily energy expenditure from your activity, compare the five levels and get guideline intakes for each weight goal.

Find your ideal weight for your height: healthy BMI range and the Devine, Robinson, Miller, Hamwi, Lorentz, Broca, Creff and Monnerot-Dumaine formulas.

Crop, resize, add captions or watermarks, apply effects, and optimize an image in one editor.

Resize an image by setting its exact width and height before downloading the result.

Convert an image to PNG, JPEG, or WebP and adjust output quality before download.

Create a QR code locally for text, a URL, email, phone number or Wi-Fi network.

Draw a frame on the image, lock a ratio (1:1, 4:5, 16:9…) and download the cropped part.

Lighten an image by setting its quality or aiming for a size in KB, with the final size shown before download.

Draw up to 1,000 random integers or decimals in a range, with or without repeats, for raffles, dice or sampling.

Convert length, weight, volume, temperature, pressure, energy, fuel economy, digital storage and electrical units with exact factors.

Calculate X% of a value, what percentage a value is of a total, the percent change between two values or the original value before a change.

Convert degrees Celsius to Fahrenheit and back with the exact formula °F = °C × 1.8 + 32, plus a table of common temperatures.

Write a number in words in English, French, Spanish, German, Italian or Portuguese, or turn written words back into digits.

Add, subtract, multiply, divide and simplify fractions, with every step shown.

Merge multiple PDF files in the order you select them to create one combined document.

Split a PDF into multiple files using the pages or page ranges you choose.

Reduce PDF file size locally with lossless optimization or stronger visual compression.

Combine several images into a single PDF document.

Convert PDF pages into individual images ready to download directly in your browser.

Add text, annotations, images, drawings or a signature directly to your PDF.

Enter any two values among voltage, current, resistance and power to calculate the other two automatically.

Calculate a dilution concentration or volume from three known values using C₁V₁ = C₂V₂.

Calculate density, mass or volume from any two known values with automatic unit conversion.

Calculate average speed, distance or elapsed time from any two known values with automatic unit conversion.

Calculate net force, mass or acceleration from any two known values using F = ma.

Calculate molar concentration, amount of substance or solution volume from any two known values.

Decode a JWT to read its header, payload, claims and expiration dates.

Compute MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of a text or file in one go.

Generate strong random passwords from 8 to 128 characters, with the entropy shown.

Encrypt and decrypt text with a password using AES-256-GCM, right in your browser.

Check how strong a password is: entropy, weak patterns, estimated time to crack and advice.

Generate TOTP 2FA codes from a Base32 secret, build the otpauth:// URI and verify a 6- or 8-digit code.

Remove duplicate lines from a list while keeping one occurrence of each value.

Analyse a text and get its number of words, characters, lines, sentences and paragraphs.

Remove extra spaces, repeated tabs and empty lines from copied text.

Generate Lorem Ipsum placeholder text for mockups, prototypes and layout tests.

Convert text to lowercase, UPPERCASE, Title Case or other common case styles.

Compare two texts line by line and quickly spot additions, deletions and changes.

Create SEO, Open Graph and Twitter/X tags for a web page.

Create a clear robots.txt file to guide web crawlers.

Create an XML sitemap from a list of URLs.

Analyze key SEO signals in HTML locally.

Preview a search result from a title and meta description.

Validate JSON-LD syntax and detect types, entities, and structural warnings.