Useful tools. Only the essentials.

Calculate, convert, analyze, and create right in your browser. ARIFMERA keeps focused tools for work, study, and everyday tasks together in one clear place.

Choose a tool

Ready in your browser

No separate software to install: open a tool and get straight to the task.

Clear at first glance

Each tool handles one focused task with clear inputs and predictable results.

A growing collection

Can’t find what you need? Suggest a tool—your ideas help decide what comes next.

Find the tool you need

Search by name, filter by topic, or browse the full collection.

Suggest a tool

Audio converter

Convert audio to MP3, M4A, WAV, FLAC, Ogg, Opus, and more. Adjust quality, sample rate, and channels, or extract audio tracks from video.

BMI Calculator

Calculate body mass index with indicative adult category classification.

Calendar

Interactive calendar with holidays of the world, lunar phases, memorable events. Displays holidays on the calendar.

Currency Converter

Convert amounts between currencies using available exchange rates.

Date Difference Calculator

Calculate the exact difference between two calendar dates in days, weeks, and hours.

FASM — x86 assembler and debugger

Write and run FASM assembly programs. Debug step by step, set breakpoints, and inspect registers and memory.

Focus Flow — ambient focus studio

An ambient sound studio for focus, relaxation, and sleep. Mix 20 real recordings, tune a separate binaural beat, and start a session.

Image converter

Convert images to PNG, JPEG, WebP, GIF, TIFF, BMP, and more. Choose quality and process multiple files at once.

Length Unit Converter

Convert between metres, centimetres, kilometres, yards, feet, and inches.

MP3 Tag Editor

Online MP3 metadata editor. Edit title, artist, album, cover art, lyrics and other tags. Batch editing of multiple files.

Password Generator

Generate random passwords with your choice of length, quantity, and characters.

Percentage Calculator

Calculate a percentage of a number, one number as a percentage of another, and percentage change.

PlantUML editor

Create diagrams from text, see changes instantly, and export as SVG, PNG, or ASCII.

Pulse transformer calculator

Design a high-frequency transformer for push-pull, half-bridge and full-bridge converters with turns, currents, wire sizing, core loss, window fill, up to five outputs and output chokes.

Random number generator

Powerful random number generator: integer/fractional values, customizable ranges. Features: exclude duplicates, sort.

Step-by-step Boolean function

Solve a Boolean function from a formula, value vector, or editable truth table with every transformation shown.

Text analysis

Count words, letters, characters, and sentences in text in different languages.

Text Memorization

A tool for memorizing poems and texts. Gradual word hiding for memory training.

Time Unit Converter

Convert durations between units from nanoseconds to millennia.

Venn diagram

Build Euler–Venn diagrams for 2–4 sets using formulas or actual elements, with membership tables and export.

Video converter

Convert video to MP4, WebM, MKV, MOV, AVI, GIF, and more. Choose quality and keep or remove the audio.

Weight Unit Converter

Convert between kilograms, grams, tonnes, ounces, and pounds.