More free tools from our network.

Beyond images, we maintain a network of free, focused tools across calculators, developer utilities, text processing, and reference. All free, all useful, all without signup.

Each site below does one thing well. No accounts, no rate limits, no surprise paywalls. Same philosophy as pictoolkit — focused tools that respect your time.

Calculators

Square Footage Calculator

Calculate square footage for rooms, lots, and projects. Supports rectangles, triangles, circles, and irregular shapes.

thesquarefootagecalculator.com ↗

Best Percentage Calculator

Percentage calculations of every variety — increase, decrease, of-total, tip, tax, and more.

bestpercentagecalculator.net ↗

Calculate exact age in years, months, days, hours. Works between any two dates.

theagecalculator.net ↗

Calculate Hours

Time duration calculator. Add or subtract hours and minutes between time entries.

calculatehours.net ↗

Margin vs Markup

Convert between profit margin and markup, find break-even, and factor in platform fees, shipping, and tax.

marginvsmarkup.com ↗

Dimensional Weight Calculator

Billable shipping weight for FedEx, UPS, USPS, DHL and more carriers — compares actual vs volumetric weight.

dimweightcalc.com ↗

Box Volume Calculator

Calculate the volume of a box from its length, width, and height in any units. For shipping and packing.

boxvolumecalculator.com ↗

Girth Calculator

Parcel length-plus-girth against carrier size limits, plus body circumference measurements for fitness.

girthcalculator.com ↗

Solar Calculator

Free, unbiased solar and off-grid calculators — system sizing, savings and payback, and battery banks.

prosolarcalc.com ↗

EMI Calculator (India)

EMI for home, car, and personal loans in India, with a full amortization schedule and prepayment impact.

indiaemi.com ↗

Total Interest Calculator

Total interest paid over the life of a loan, comparing terms and rates with a full amortization breakdown.

totalinterestcalc.com ↗

Project mutual-fund SIP returns, step-up SIPs, and goal-based investing, with maturity value and charts.

sipcalculatorhub.com ↗

Compute semester and cumulative GPA on 4.0 and weighted scales, converting letter grades and percentages.

gpacalculatorhq.com ↗

Fraction Calculator

Add, subtract, multiply, and divide fractions with step-by-step working, simplification, and decimals.

fractionsteps.com ↗

Calorie Calculator

Estimate daily calorie needs, TDEE, and macros — BMR-based targets for loss, maintenance, or gain.

calorieskit.com ↗

BMI & BMR Calculator

Calculate BMI, BMR, and daily calorie needs in metric or imperial, with healthy-weight ranges.

bmibmrcalc.com ↗

AC Tonnage Calculator

Size an air conditioner by room area, climate, and occupancy — BTU and tonnage estimates for any space.

actonnagecalc.com ↗

Tank Volume Calculator

Volume and fill level for cylindrical, rectangular, and oval tanks — horizontal or vertical, litres or gallons.

tankvolumecalc.com ↗

Cubic Yardage Calculator

Cubic yards for concrete, mulch, gravel, soil, and sand from your dimensions in any units.

cubicyardage.com ↗

Pool Volume Calculator

Pool volume in gallons or litres for rectangular, round, and oval pools, with dosing help for chemicals.

poolvolumecalc.com ↗

Concrete Material Calculator

Concrete volume plus cement, sand, and aggregate quantities — slabs, footings, and bags by mix ratio.

concretematerialcalc.com ↗

Roofing Material Calculator

Roofing squares, shingle bundles, and underlayment from area and pitch, with a waste factor built in.

roofingmaterialcalc.com ↗

Stair Calculator

Stair rise, run, stringer length, and headroom to code, with a diagram for carpentry and deck building.

staircalculators.net ↗

Construction Calculators

A hub of construction calculators — concrete, framing, drywall, paint, and more, with material estimates.

constructioncalchq.com ↗

Voltage Drop Calculator

Voltage drop and correct wire size for AC and DC circuits, with NEC and IEC formulas.

voltdropcalc.com ↗

Solar Battery Bank Calculator

Size an off-grid battery bank from daily load, autonomy days, and depth of discharge, with lithium presets.

solarbatterybankcalc.com ↗

Backup Power Calculator

Estimate UPS and generator runtime from load and battery capacity, for home, office, and server racks.

backuppowercalc.com ↗

Cooking Measurement Converter

Convert cooking measurements between cups, grams, ounces, and millilitres, with recipe scaling.

measurechef.com ↗

Developer

Encode and decode Base64 strings. Supports text, URLs, and binary data.

base64decode.tools ↗

URL Encode / Decode

Encode and decode URL strings with proper percent-encoding for special characters.

urlencodedecode.com ↗

Format, validate, minify, and convert JSON. Includes JSON to CSV and JSON diff.

jsontools.tools ↗

Generate UUIDs (v1, v4, v5) for development, testing, and database keys.

www.uuidcore.com ↗

Generate MD5, SHA-1, SHA-256, SHA-512 hashes from text or files.

hashgenerator.tools ↗

Epoch Time Converter

Convert between Unix epoch timestamps and human-readable dates.

epochtime.tools ↗

Crontab Cheatsheet

Build and validate cron schedule expressions with human-readable explanations.

crontabsheet.com ↗

Test, build, and learn regular expressions with real-time matching.

regexguide.com ↗

CIDR Calculator

Calculate, split, and visualize subnets. IPv4/IPv6, VLSM planner, cloud-aware reserved IPs, Terraform export.

cidrcalculator.net ↗

Subnet Mask Calculator

Network and broadcast addresses, usable host range, wildcard masks, and VLSM planning for IPv4 and IPv6.

subnetmaskcalc.net ↗

Merge, split, compress, convert, and rotate PDFs in your browser — no uploads, files stay on your device.

corepdftools.com ↗

Convert between HEX, RGB, HSL, and CMYK, build palettes, check contrast, and copy ready-to-paste CSS.

colorcodekit.com ↗

Barcode & QR Generator

Generate QR codes and barcodes (Code 128, EAN, UPC), downloadable as PNG or SVG for print and labels.

barcodeandqr.com ↗

Internet Speed Test

Test download, upload, ping, and jitter right in the browser — quick, accurate, no app to install.

checkinternetspeed.tools ↗

See your public IPv4 and IPv6 address, ISP, and approximate location, plus request headers.

checkmyipnow.com ↗

Look up domain WHOIS, registrar, name servers, expiry dates, and DNS records for any domain.

whoislookuppro.com ↗

Security

Password Strength

Test password strength against modern requirements. Checks for entropy, common patterns, breaches.

passwordstrength.net ↗

Remove Metadata

Strip EXIF, GPS, and hidden metadata from images, PDFs, and Office files — locally in your browser.

removemetadata.tools ↗

Text

Count words, characters, sentences, paragraphs, and reading time for any text.

wordcounterfree.com ↗

Repeat any text N times with custom separators. Useful for testing, padding, and bulk generation.

textrepeat.net ↗

Convert text between cases — upper, lower, title, camel, snake, kebab, sentence.

transformcase.com ↗

Number to Words

Convert numbers to words for cheques, invoices, and legal documents, with currency wording support.

numtotext.com ↗

Reference

Unit Cheatsheet

Convert between metric and imperial units across length, weight, volume, area, and temperature.

unitcheatsheet.com ↗

World clock with timezone comparisons. Helpful for scheduling across regions.

clockwithus.com ↗

Have a tool you wish existed? Let us know — we're always adding to the network.