Fast, free, no-nonsense online tools
A growing library of fast, free, privacy-friendly online tools. Converters, calculators, formatters, validators and generators that just work.
1384 free tools and counting
Popular tools
AI Background Remover
Remove the background from a photo automatically with AI, right in your browser. Get a transparent PNG or a solid color. Nothing is uploaded.
AI Object Cutout
Click any object in a photo and AI cuts it out exactly. SlimSAM runs in your browser, nothing uploaded. Refine with clicks, download a transparent PNG.
Document Scanner
Scan documents from a photo in your browser: automatic edge detection, perspective correction, and enhancement, then export as a PNG or a PDF.
Object Detector
Detect objects in any photo with YOLO11, right in your browser. Draw labeled boxes, count what it finds, and download the result. Nothing is uploaded.
Audio Transcriber
Transcribe audio to text in your browser with OpenAI's Whisper AI. Get timestamps, export SRT, VTT or TXT, pick a quality level. Nothing is uploaded.
AI Translator
Translate text between 100 languages with AI in your browser. Pick a source and target language. Nothing is uploaded; works offline after setup.
Image to Text (OCR)
Extract text from an image with OCR, right in your browser. Supports many languages, copy or download the result. Your image is never uploaded.
AI Image Upscaler
Upscale and enhance images with AI in your browser. Increase resolution 2x or 4x with sharp detail, no blur. Free, private, nothing uploaded.
Newly launched
See all →3D Print Cost Calculator
Price a full 3D print job: filament, electricity, machine wear, labor and markup. Get a clear cost breakdown and total in dollars. Free tool.
50/30/20 Budget Calculator
Split your monthly take-home pay with the 50/30/20 rule. See dollar amounts for needs, wants and savings each month and year. Free and private.
555 Timer Calculator
Calculate 555 timer astable frequency, period, high and low times and duty cycle from R1, R2 and the timing capacitor. Free oscillator design helper.
Absolute Humidity Calculator
Calculate absolute humidity in grams of water vapor per cubic meter from air temperature and relative humidity. Fast, free and works in your browser.
ABV Calculator
Calculate beer ABV, apparent attenuation and rough calories from original and final gravity. Free homebrew tool with the ABV formula shown.
Add Border to Image
Add a colored border or frame around an image, with adjustable width and color. Live preview, runs in your browser, nothing uploaded.
Add Business Days Calculator
Add or subtract working days from a date, skipping weekends and any holidays you list. See the result date and its day of the week instantly.
Add Days Calculator
Add or subtract calendar days from any date and see the result with its day of the week. Free, instant and works for past or future dates.
Browse by category
Converters
Convert between data formats, units, colors and encodings. Fast, accurate, no upload required for client-side formats.
95 toolsImage Tools
Inspect and clean images privately in your browser: read EXIF and metadata, check dimensions and format, and strip GPS and camera data. Nothing is uploaded.
59 toolsFile Tools
Inspect any file in your browser: identify the type from its bytes, view a hex dump, list a ZIP's contents, measure entropy, extract strings and verify checksums. Nothing is uploaded.
30 toolsAudio Tools
Read audio metadata in your browser: ID3 tags, bitrate, duration, sample rate and format for MP3, WAV and FLAC. Private, with nothing uploaded.
23 toolsPDF Tools
Inspect PDF files privately in your browser: page count, document metadata, version and encryption status. Read entirely on your device with nothing uploaded.
19 toolsText Tools
Clean, count, transform and compare text. Remove line breaks, change case, dedupe lines and more.
110 toolsChat & Collaboration
Real-time team communication tools that run in your browser: channel-based messaging with a clean composer, optimistic send and no setup.
1 toolWork & Productivity
Plan and run work in your browser: a full-screen task board for projects, sections and tasks with assignees, due dates and instant optimistic editing. No setup.
1 toolDeveloper Tools
Formatters, encoders, decoders and generators for developers. JSON, JWT, Base64, hashes, UUIDs and regex.
177 toolsSecurity Tools
Practical security tooling for developers and pentesters: header and CSP analyzers, hash and CVSS tools, TOTP and HMAC generators, and helpers for authorized testing.
15 toolsSEO Tools
Practical SEO utilities: meta tag generators, schema builders, slug and robots.txt generators, SERP helpers.
42 toolsFinance Calculators
Money math made simple: loans, interest, savings, tax and retirement calculators with clear breakdowns.
114 toolsBusiness Tools
Run the numbers for your business: margins, breakeven, pricing, ROI and commission calculators.
41 toolsHR & Office
Workplace utilities: timesheet and overtime calculators, letter and document generators for HR teams.
34 toolsDocuments & Legal
Generate invoices, quotations, NDAs and contracts with clean, professional, ready-to-send formatting.
30 toolsAI Utilities
AI-assisted writing and prompt tools: rewriters, prompt builders and formatters for everyday work.
0 toolsEcommerce Tools
Seller math: marketplace fees, profit, margin and shipping calculators for Amazon, Etsy, eBay and more.
28 toolsHealth & Fitness
Evidence-based health and fitness calculators: BMI, BMR, TDEE, body fat, macros, pace and more.
42 toolsDate & Time
Work with dates and times: age, date differences, business days, durations, time zones and countdowns.
41 toolsMath
Everyday and advanced math: fractions, ratios, primes, statistics, roman numerals, equations and more.
112 toolsValidators
Validate and verify codes, numbers and identifiers: credit cards, IBAN, ISBN, barcodes, routing numbers and more, with the correct checksums.
15 toolsHome & DIY
Plan home and DIY projects with confidence: estimate paint, flooring, tile, mulch, concrete and other materials, size an air conditioner, and more.
74 toolsScience & Engineering
Physics and electronics calculators: Ohm's law, resistor color codes, density, speed and distance, energy and more, with the formulas shown.
122 toolsPhotography
Camera and lens calculators for photographers: depth of field, hyperfocal distance, crop factor, field of view, exposure value and more, with the optics explained.
12 toolsAutomotive
Car and engine calculators for drivers and gearheads: gear ratios, gas mileage, engine displacement, tire size, power to weight and compression ratio, with the math shown.
16 toolsSports & Recreation
Sports stat calculators for fans and players: batting average, ERA, slugging and on-base percentage, NFL passer rating, winning percentage and golf handicap, with the formulas shown.
13 toolsAviation
Flight planning calculators for pilots and students: crosswind component, true airspeed, fuel burn, glide ratio, rate of climb and top of descent, with the rules of thumb explained.
6 toolsCrafts & Sewing
Project calculators for makers: fabric yardage, knitting and crochet gauge, yarn substitution, seam allowance, cross stitch fabric and quilt backing, so you buy the right amount.
19 toolsBrewing
Homebrew calculators for beer makers: ABV, IBU bitterness, priming sugar, strike water temperature, mash efficiency and Brix to gravity, with the brewing formulas shown.
6 toolsBoating & Sailing
Calculators for boaters and sailors: hull speed, anchor scope, distance to horizon, sail area to displacement, fuel planning and the Beaufort wind scale, with the formulas shown.
6 toolsJewelry & Gems
Calculators for jewelers and buyers: carat weight, gold purity and karat, ring size, diamond price, and gold and silver scrap melt value, with the conversions shown.
6 toolsDrinks & Bartending
Calculators for hosts and bartenders: cocktail dilution, simple syrup ratios, wine servings, standard drinks, punch batching and keg servings, so you pour the right amount.
6 toolsPets & Animals
Calculators for pet owners: dog and cat food portions, puppy adult weight, aquarium stocking, water intake and medication dosage by body weight, with the formulas shown.
10 tools3D Printing
Calculators for 3D printing: filament weight and length, filament and resin cost, infill weight, electricity cost and full print job pricing, so you quote and plan prints.
6 toolsVideo & Film
Calculators for video creators: file size, recommended bitrate, recording storage, timecode, aspect ratio resize and shutter angle, so you plan shoots and exports.
6 toolsCamping & Outdoors
Calculators for hikers and campers: hiking time, trail water and calories, backpack weight, sleeping bag rating and land-nav pace count, so you plan trips safely.
6 toolsFarming & Agriculture
Calculators for farmers and homesteaders: seeding rate, livestock water, hay bales, pasture stocking rate, chicken feed and silage, so you plan inputs and herds.
14 toolsCycling
Calculators for cyclists: gear inches, speed from cadence, FTP and power zones, power to weight, spoke length and calories burned, with the formulas shown.
6 toolsWelding & Metalwork
Calculators for welders and fabricators: amperage, heat input, weld metal volume, filler and shielding gas use and total weld cost, with the formulas shown.
6 toolsScuba Diving
Calculators for scuba divers: nitrox maximum operating depth, equivalent air depth, best mix, oxygen partial pressure and air consumption, with the dive formulas shown.
5 toolsHam Radio & RF
Calculators for ham radio operators: dipole and vertical antenna length, dBm to watts, coax cable loss and SWR, with the RF formulas shown.
5 toolsModel Rocketry
Calculators for model rocketeers: thrust to weight ratio, estimated altitude, parachute descent rate and ejection delay, with the physics shown.
5 tools