Simulate your final average price and total investment in real-time when buying more shares.
Drag across the waveform to select and trim part of an audio file.
Convert one MP3 audio file to WAV in your browser.
Convert one WAV audio file to MP3 in your browser.
Boost or lower one MP3 or WAV file and download the same format.
Change audio speed and download the result as a WAV file.
Reverse one MP3 or WAV file and download the same format.
Download a TXT summary with audio duration, size, and type.
Create a silent WAV file for editing, testing, or video timelines.
Calculate trade profit, loss, return rate, and final value from buy and sell prices.
Find percentages, percentage change, and how much one value is of another.
Estimate future value from principal, monthly contributions, time, and annual return.
Estimate monthly payments, total repayment, and total interest for a loan.
Convert common length, weight, and temperature units instantly.
Convert money using a manually entered exchange rate.
Convert bytes, KB, MB, GB, and TB quickly.
Convert speed between mph, km/h, m/s, and knots.
Convert common area units such as square meters, acres, and square feet.
Convert liters, milliliters, gallons, cups, and fluid ounces.
Convert a time between common UTC offsets.
Convert dates to Unix timestamps and back in real time.
Pick colors and convert HEX, RGB, RGBA, HSL, and Tailwind formats.
Convert numbers between decimal, binary, hex, and octal.
Convert degrees, radians, and gradians.
Convert watts, kilowatts, and horsepower.
Convert pascal, bar, PSI, and atmosphere.
Convert joules, calories, kWh, and BTU.
Convert Hz, kHz, MHz, and GHz.
Convert running pace and speed units.
Calculate final price and savings from an original price and discount rate.
Add sales tax to a price and see the tax amount and final total.
Split a bill with tip across any number of people.
Find the number of days between two calendar dates.
Calculate hours and minutes between two times, including overnight spans.
Calculate body mass index from height and weight.
Estimate trip fuel usage and cost from distance, efficiency, and fuel price.
Estimate monthly mortgage payments from home price, down payment, rate, and term.
Calculate exact age in years, months, and days from a birth date.
Estimate daily maintenance calories using age, height, weight, sex, and activity level.
Calculate weighted GPA from grades and credits for up to four classes.
Count characters, words, lines, and UTF-8 bytes in real time.
Generate fantasy character names for games, stories, and worlds.
Create names for kingdoms, towns, forests, ruins, and magical places.
Create futuristic character, pilot, android, and explorer names.
Generate names for planets, stations, sectors, colonies, and ships.
Generate simple brand and business name ideas instantly.
Create quick username ideas for games, apps, and profiles.
Spin a lunch slot machine and let chance choose today's meal.
Spin the names and let chance decide who pays this time.
Generate a random password locally in your browser.
Pick a random number between your chosen minimum and maximum.
Generate a browser-local UUID for testing and development.
Generate quick placeholder text for layouts and mockups.
Crop one image by position and size, then download the result.
Convert one PNG image to a JPG file in your browser.
Convert one JPG image to a PNG file locally.
Resize one image by width while keeping its ratio.
Compress one image to a smaller JPG file.
Convert one image to a compact WebP file.
Convert one WebP image to a PNG file locally.
Rotate or flip one image and save it as a PNG file.
Convert one image into a Base64 data URL text file.
Paste a Base64 data URL and download it as an image.
View image type, file size, dimensions, and ratio.
Click an image preview to pick HEX and RGB colors.
Apply grayscale, sepia, brightness, or contrast and download.
Cut a video between start and end times without uploading it.
Turn a short section of a local video into an animated GIF.
Reduce a local video's file size and download an MP4.
Convert MP4 to WebM or WebM to MP4 locally.
Extract MP3 or WAV audio from a local video file.
Convert subtitle files between SRT and WebVTT formats.
Simulate hero summons with normal, rare, epic, legendary, mythic drops and pity.
Open loot boxes with normal, rare, epic, legendary, and mythic odds.
Roll RPG dice with count and modifier for tabletop-style games.
Create detailed RPG characters with traits, backstory, flaws, and hooks.
Generate richer quests with stakes, twists, NPCs, rewards, and story hooks.
Generate detailed loot with rarity, stats, powers, drawbacks, and lore.
Split names into random teams for games, events, or practice.
Create randomized first-round tournament matchups from player names.
Flip a coin, roll a die, or pick one option from your list.
Wait for the signal and tap as fast as you can.
Match animal and food emojis across endless timed stages that become progressively harder.
Race through ten choices drawn from 500 impossible dilemmas and reveal your decision style.
Align sprite frames, preview animations, and export a corrected PNG.
Super Fast Tool is a collection of quick calculators and utility tools for everyday tasks.
It is designed for fast answers without signup, installation, or complicated menus.
The collection includes calculators, converters, generators, image, video and audio utilities, plus lightweight browser games. Each tool has a focused page so you can get to the result without working through unnecessary steps.
Private by design
Calculator inputs and supported file operations are processed locally in your browser whenever possible. Super Fast Tool does not upload those inputs or files to its own server.
Built for everyday use
The tools are designed to work on desktop and mobile browsers with clear controls, immediate feedback, and downloadable results where appropriate. New utilities and improvements are added as useful ideas emerge.
Results and responsibility
Results are provided for convenience and general guidance. Important financial, health, legal, or technical decisions should be checked against an authoritative source or qualified professional.
Questions, bug reports, and suggestions for new tools are always welcome through the Contact form.
Privacy Policy
Super Fast Tool does not require accounts and does not collect calculator input values.
Some external services may be loaded for site functionality, such as translation, styling, icons, or future advertising. These services may use their own cookies or request logs according to their policies.
Advertising and cookies are explained in the full Privacy Policy, including Google AdSense or related advertising services if they are enabled on the site.
Local data
Starred tools are saved only in your browser using local storage, so your favorites can stay available after a refresh.
Contact form
When you submit the Contact form, your name, email address, and message are sent to Formspree so the message can be delivered to us. Do not include passwords, payment details, payment information, government identifiers, medical records, or other sensitive information.
No financial advice
Finance-related calculators are provided for quick estimates only and should not be treated as investment, tax, or legal advice.
Updates
This policy may be updated as new tools, analytics, advertising, or hosting features are added.