Tools for the task at hand
Free calculators, file & printable tools
Free calculators, image and PDF tools, plus printable worksheets and puzzles. Most tools run in your browser with no sign-up.
🔒 Browser-based tools, with clear data handling on each page
57 tools
Business Tools
40 tools · browse ↓
Invoice Late Fee Calculator
Calculate the late fee on an overdue invoice free. Enter the amount, days late and monthly or annual rate to get the exact interest and new balance.
Profit Margin Calculator
Free profit margin calculator. Enter cost and price to get gross margin, profit per unit and markup, or work backwards from a target margin to a price.
Markup Calculator
Free markup calculator. Turn cost into a selling price at any markup percentage, and see the margin that markup actually produces. No sign-up needed.
Break Even Calculator
Free break-even calculator. Enter fixed costs, price and variable cost per unit to find your break-even point in units, revenue and contribution margin.
Salary to Hourly Calculator
Convert an annual salary to an hourly, daily, weekly and monthly rate free. Adjust hours per week and paid time off for a realistic effective hourly wage.
Overtime Calculator
Calculate overtime pay at time and a half or double time. Handles the FLSA bonus rule and California daily overtime. Free, no sign-up.
PTO Accrual Calculator
Calculate PTO accrual per hour worked or per pay period, track your balance, and see how a carryover cap causes hours to be forfeited.
Mileage Reimbursement Calculator
Calculate mileage reimbursement using the 2026 IRS rates. Handles the mid-year change from 72.5 to 76 cents, plus medical and charitable rates.
NDA Generator
Generate a mutual or one-way NDA free. Covers the standard exclusions, survival period and compelled disclosure that free templates skip. No sign-up.
Privacy Policy Generator
Generate a privacy policy that matches your real data practices. Emits the clauses Google requires for AdSense, plus GDPR and CCPA sections. Free.
Refund Policy Generator
Generate a refund policy for goods, digital products or services. Warns when your choices collide with posting laws and the EU 14-day right. Free.
DIM Weight Calculator
Calculate dimensional (DIM) weight with the 2026 divisors: USPS and UPS/FedEx at 139, express at 5000 cm³/kg. Works in lb/in and kg/cm. Free, no sign-up.
Freight Class Calculator
Find your freight class from density under the NMFC scale effective July 2025. Shows the legacy chart comparison and reclass warnings. Free.
Pallet Calculator
How many boxes fit on a 48×40 pallet? Enter box size to get TI × HI, layers, deck utilization, pallets per shipment and the weight cap. Free, no sign-up.
CPM Calculator
Calculate CPM from spend and impressions, see the viewable CPM behind it, and plan what any budget buys. Free, no sign-up, runs in your browser.
CTR Calculator
Calculate click-through rate from clicks and impressions, plan clicks from a CTR, and read the result against typical channel ranges. Free.
Google Ads Budget Calculator
Plan a Google Ads budget with Google's real rules: 30.4× monthly cap, 2× daily overdelivery, clicks, leads, sales and the Smart Bidding floor. Free.
UTM Builder
Build UTM campaign URLs free: source, medium, campaign and content auto-lowercased and underscored so Analytics never splits your traffic. No sign-up.
A/B Test Sample Size Calculator
How many visitors per variant does your A/B test need? Baseline rate, minimum detectable effect, power and significance — the standard two-proportion formula, free.
Target ROAS Calculator
Set target ROAS from your gross margin, not a screenshot: break-even ROAS, the tROAS that leaves real profit per order, and the max CPC that clears it. Free.
Conversion Rate Calculator
Calculate conversion rate free: visitors, conversions and spend to rate, cost per conversion, and the gap to your benchmark — with the funnel-stage trap explained.
Mortgage Calculator
Free mortgage calculator with taxes, insurance, PMI and HOA. See the true monthly payment on any home price, plus total interest and payoff months.
Home Affordability Calculator
How much house can you afford? Enter income, debts and down payment to get your price ceiling under the 28/36 rule, with PMI and closing costs.
Rent Increase Calculator
Project a rent increase over up to ten years with full compounding. See the new rent, the yearly path and the total extra paid — caps and notice rules too.
Closing Cost Calculator
Estimate buyer closing costs free: lender fees, title, transfer tax and prepaid escrow, itemized — with the total shown against both the loan and the price.
Property Tax Calculator
Estimate property tax from home value and the effective rate: annual bill, monthly escrow and homestead exemption — with state rates from the Tax Foundation.
Hourly to Salary Calculator
Convert an hourly wage to annual, monthly and biweekly pay in seconds. Set hours and unpaid weeks off to see the real annual figure behind an offer.
Commission Calculator
Free sales commission calculator: marginal or retrospective tiers, base salary, revenue or gross-profit basis, and draw recovery — see the full payout.
Average Down Calculator
Free stock average-down calculator: weighted cost across multiple buys, all-in break-even with fees, unrealized P/L, and the prices needed for +5% to +50% gains.
Stock Profit Calculator
Free stock profit calculator: net gain after entry and exit fees and capital-gains tax, return on capital, and the break-even exit price — long or short.
Position Size Calculator
Free position size calculator: shares from account size, risk percent, entry and stop — with a position-value cap and a simplified Kelly comparison.
DCA Calculator
Free dollar-cost-averaging calculator: total invested, contribution fees, gain and an approximate annualized return — with the cumulative out-of-pocket schedule.
LTV Calculator
Customer lifetime value done right: gross-margin-adjusted LTV with the revenue figure shown beside it, plus LTV:CAC ratio and CAC payback months.
Concrete Calculator
Concrete calculator for slabs, footings and columns: cubic yards with waste allowance, 80/60/40 lb bag counts, and when to order ready-mix instead.
Paint Calculator
How much paint do I need? Enter room size and openings for gallons at two-coat math — doors and windows deducted, Sherwin-Williams coverage, gallon + quart buying.
Flooring Calculator
How many boxes of flooring do I need? Room area with layout-based waste — 10% straight, 15% diagonal, 20% herringbone — rounded up to whole boxes, with cost.
Tile Calculator
How much tile do I need? Room area, tiles from their inch dimensions, pattern waste — 10% straight, 15% diagonal, 20% herringbone — in whole boxes.
AI Product Description Generator
Free AI product description generator for online stores. Turn product names and features into ready-to-paste copy. Bring your own free API key.
AI Payment Reminder Email Generator
Free AI payment reminder email generator for overdue invoices. Write a polite nudge, firm follow-up or final notice in seconds. Bring your own free API key.
AI Review Reply Generator
Free AI review reply generator for Google, Yelp and Facebook. Turn customer reviews into professional responses in seconds. Bring your own free API key.
Image Tools
6 tools · browse ↓
Compress Image
Compress JPG, PNG and WebP images online for free. Reduce file size without losing quality. No upload — images are processed in your browser.
Resize Image
Resize JPG, PNG and WebP images online for free. Set exact width and height in pixels. No upload — images are processed in your browser.
PNG to JPG
Convert PNG to JPG online for free and shrink file size instantly. Batch convert multiple PNGs to JPG. No upload — processed in your browser.
Perler Bead Pattern Generator
Turn any photo into a fuse bead pattern free. Perler, Hama and Artkal palettes with bead counts, board layout and a printable chart. Runs in your browser.
AI Image Generator
Free AI image generator that turns text prompts into images. Bring your own free API key — prompts go directly from your browser to the AI model. No sign-up here.
AI Image Editor
Edit photos by describing the change. AI image editor with style transfer, relighting and background swap. Bring your own free API key — no sign-up.
PDF Tools
3 tools · browse ↓
Compress PDF
Optimize PDF structure locally with no upload, watermark or sign-up. Compare file sizes; if no bytes are saved, keep the original. No image recompression.
Merge PDF
Combine PDFs locally with no upload, watermark or sign-up. Use up/down arrows to reorder whole files, then download one document. Limited by device memory.
Split PDF
Divide a PDF into separate files or extract the pages you need — by range or one page at a time. Runs in your browser: no upload, no watermark, free.
Developer Tools
4 tools · browse ↓
JSON Formatter
Format, beautify, validate and minify JSON online for free. Spot errors instantly with line numbers. No upload — JSON is processed in your browser.
Base64 Encoder
Encode and decode Base64 online for free. Handles UTF-8 text safely. No upload — all conversion runs in your browser for full privacy.
UUID Generator
Generate UUID v4 online for free. Create one or thousands of unique IDs at once. No upload — UUIDs are generated in your browser.
Regex Tester
Test regular expressions online for free. See matches highlighted live with capture groups and flags. No upload — runs entirely in your browser.
Printable Tools
4 tools · browse ↓
Weekly Math Fluency Packet Generator
Make a printable math facts practice sheet for free. Pro builds a five-day Monday–Friday elementary math fluency packet with a matching answer key.
Name Tracing Generator
Free printable name tracing worksheet generator: type a name and download a US Letter PDF with a solid model row and light gray letters to trace.
Math Worksheet Generator
Create printable addition, subtraction and multiplication worksheets online. Choose the number range, preview problems and download a free classroom PDF.
Word Search Maker
Make a custom printable word search from your own vocabulary list. Preview a 12×12 puzzle, download a free PDF, or use Pro for larger grids and answer pages.
Popular tools · a quick starting point
Calculate the late fee on an overdue invoice free. Enter the amount, days late and monthly or annual rate to get the exact interest and new balance.
Open tool →Free profit margin calculator. Enter cost and price to get gross margin, profit per unit and markup, or work backwards from a target margin to a price.
Open tool →Free break-even calculator. Enter fixed costs, price and variable cost per unit to find your break-even point in units, revenue and contribution margin.
Open tool →Calculate overtime pay at time and a half or double time. Handles the FLSA bonus rule and California daily overtime. Free, no sign-up.
Open tool →Free mortgage calculator with taxes, insurance, PMI and HOA. See the true monthly payment on any home price, plus total interest and payoff months.
Open tool →Free sales commission calculator: marginal or retrospective tiers, base salary, revenue or gross-profit basis, and draw recovery — see the full payout.
Open tool →ToolNest in action · real examples
Real tools, real numbers — open one and it works immediately.
Invoice Late Fee Calculator
The calculator with a worked example: a $2,000 invoice 45 days overdue at 1.5% per month.
Profit Margin Calculator
The calculator with a worked example: $60 cost, $100 price, 40% margin.
Break Even Calculator
The calculator with a worked example: $8,000 fixed costs, $50 price and $20 variable cost per unit.
Mileage Reimbursement Calculator
A 10,000-mile claim split across the July 2026 IRS mid-year rate change, with the full rates table.
Perler Bead Pattern Generator
A worked example generated by the same pipeline: a 13×11 heart on one 29×29 board, 143 beads across 4 colors.
JSON Formatter
Raw invoice JSON pasted on the left, beautified output on the right — validation happens as it formats.
Blazing fast
Static pages and in-browser processing mean tools open and run instantly.
Privacy by design
Most tools process locally; AI pages explain when a provider receives input.
Free first
No sign-up and a genuinely useful free tier in every tool. Just open and use.