Our growing collection of free, client-side developer tools. No login, no tracking, no limits.
Generate UUID v1, v4, v5 and ULID identifiers. Bulk generation, namespace hashing, and UUID analysis tools.
Check how strong your password is. Entropy calculation, crack-time estimates, and password generation — client-side only.
Decode Base64 strings instantly. Supports standard and URL-safe Base64, binary output, and batch decoding.
Encode text or files to Base64. Standard, URL-safe, and MIME encoding. File upload to Base64 supported.
URL encode and decode strings. Handles percent-encoding, query string parsing, and full URL component analysis.
Count words, characters, sentences, and paragraphs. Reading time estimation and keyword density analysis.
Calculate square footage of rooms, floors, and irregular shapes. Useful for flooring, painting, landscaping, and real estate.
Quick percentage calculator. Compute what-percent-of-X, percent increase/decrease, tip amounts, discounts and tax in one place.
Calculate exact age in years, months, days, hours and minutes from any birthdate. Date difference and countdown to next birthday.
Format, validate, minify, and convert JSON. Pretty-print messy responses, diff two documents, and convert to CSV, YAML, or XML — all in your browser.
Convert between Unix epoch timestamps and human-readable dates. Supports seconds, milliseconds, and microseconds across time zones.
Build and decode cron expressions with plain-English explanations and next run times. Supports Unix, Quartz, AWS, and GitHub Actions.
Build, test, and debug regular expressions with token-by-token explanations, a pattern library, and ready-to-paste code in seven languages.
Repeat any word, phrase, or emoji up to 100,000 times with custom separators and optional numbering. Useful for test data and placeholders.
Convert text between Title Case (AP, Chicago, APA, MLA), sentence case, camelCase, snake_case, kebab-case, and more, with side-by-side preview.
Engineering and scientific unit converter with printable reference tables — wire gauges, drill bits, thread specs, pipe sizes, and more.
Work hours and timesheets — hours between times, weekly totals, overtime pay, time between dates, and 50+ time zones. No signup.
Online alarm clock, timer, stopwatch, and world clock that runs in your browser. Alarms ring even with the tab in the background.
Dimensional (billable) shipping weight for FedEx, UPS, USPS, DHL and 13 more carriers. Compare actual vs volumetric weight with 2026 divisors.
Calculate the volume of a box from its length, width, and height in any units. For shipping, storage, and packaging planning.
Parcel length-plus-girth against carrier size limits, plus body circumference measurements for fitness tracking. Two calculators in one.
Convert between profit margin and markup, find break-even, and factor in platform fees, shipping, and tax. With multi-product comparison.
Free, unbiased solar and off-grid calculators — system sizing, savings and payback, battery banks, and country-specific incentive rules.
Calculate, split, and visualize subnets. IPv4/IPv6, VLSM planner, cloud-aware reserved IPs (AWS, Azure, GCP), and Terraform export.
Network and broadcast addresses, usable host range, wildcard masks, and VLSM planning for IPv4 and IPv6. Cloud-aware, with a learn center.
Browser-based image tools — compress, convert, resize, crop, and watermark. JPG, PNG, WebP, AVIF, HEIC. Files never leave your device.
Strip EXIF, GPS, and hidden metadata from images, PDFs, and Office files — locally in your browser, with a pre-strip inspector.
EMI calculator for home, car, and personal loans in India. Full amortization schedule, prepayment impact, and total interest breakdown.
Merge, split, compress, convert, and rotate PDFs right in your browser. No uploads to a server — files stay on your device.
Pick colors and convert between HEX, RGB, HSL, and CMYK. Build palettes, check contrast, and grab ready-to-paste CSS values.
Generate QR codes and barcodes (Code 128, EAN, UPC, and more). Download as PNG or SVG for print, packaging, and labels.
Calculate voltage drop and correct wire size for AC and DC circuits. NEC and IEC formulas with copper and aluminium conductors.
Estimate daily calorie needs, TDEE, and macros from your goals. BMR-based targets for weight loss, maintenance, and gain.
Find the total interest paid over the life of any loan. Compare terms and rates with a full amortization schedule.
Size an air conditioner by room area, climate, and occupancy. Get BTU and tonnage estimates for homes and offices.
Volume and fill level for cylindrical, rectangular, and oval tanks. Horizontal or vertical, in litres or gallons.
Calculate cubic yards for concrete, mulch, gravel, soil, and sand. Enter dimensions in any units and get material quantities.
Calculate BMI, BMR, and daily calorie needs in one place. Metric and imperial, with healthy-weight ranges and activity factors.
Size an off-grid battery bank from your daily load, autonomy days, and depth of discharge. Lead-acid and lithium presets.
Add, subtract, multiply, and divide fractions with step-by-step working. Simplify, convert to decimals, and find common denominators.
Estimate UPS and generator runtime from your load and battery capacity. Size backup power for home, office, and server racks.
Convert cooking measurements between cups, grams, ounces, and millilitres. Ingredient-aware conversions and recipe scaling.
Convert numbers to words for cheques, invoices, and legal documents. Supports currency wording and multiple number systems.
Work out stair rise, run, stringer length, and headroom to code. Diagram output for carpentry and deck building.
Estimate concrete volume plus cement, sand, and aggregate quantities. Slabs, footings, columns, and bags needed by mix ratio.
Project mutual-fund SIP returns, step-up SIPs, and goal-based investing. Maturity value and wealth-gain breakdown with charts.
Calculate roofing squares, shingle bundles, and underlayment from area and pitch. Waste factor and material estimates included.
Compute semester and cumulative GPA on 4.0 and weighted scales. Convert letter grades and percentages, and plan target grades.
A hub of construction calculators — concrete, framing, drywall, paint, and more. Material estimates and quantities for any job.
Calculate pool volume in gallons or litres for rectangular, round, and oval pools. Dosing help for chlorine and chemicals.
Test your download, upload, ping, and jitter in the browser. Quick, accurate speed checks with no app to install.
See your public IPv4 and IPv6 address, ISP, and approximate location. Plus headers, user agent, and connection details.
Look up domain WHOIS, registrar, name servers, and expiry dates. DNS records and registration details for any domain.