The tool you need.
Nothing you don't.
Calculators, converters, generators, and checks that finish the job in seconds. No account, no detour, no data harvesting.
Workspaces
Whole jobs, not single tools.
Six focused suites where related tools share one flow: keep files local, inspect public URLs only when the job requires it, and carry results into the next step.
Data Workspace
CSV & Excel, end to end
Clean, merge, split, filter, convert and chain operations on spreadsheet files — all in your browser, files never uploaded.
Image Studio
Whole photo batches, processed locally
Convert HEIC, compress to an exact size, resize hundreds at once, strip EXIF losslessly and rename from a CSV — nothing leaves your device.
Private PDF Studio
One document, one local workflow
Organize, edit, inspect, redact, compress, OCR, protect and export PDFs in a private browser workspace — document bytes never need uploading.
Release Doctor
Crawl, fix, deploy, verify
Check a public website before or after launch, expose release blockers, inspect every affected URL and prove what the next deployment fixed.
Seller Workspace
Know what sold — and what you kept
Reconcile actual marketplace proceeds, review eBay order earnings, turn supplier lists into safe store updates, and make margin decisions from real seller files.
Finance Workspace
Money questions, answered in seconds
Loans, compound growth, salaries by hour, month or overtime, ROI and margins — verified formulas with sources, exportable results.
SolveKit Library
Components and templates, tested before you use them.
Enter a separate creative workspace: real demos, clear documentation, and purchasing without losing sight of what you are evaluating.
Enter the LibraryPublished
04
Demo · files · license · SEO
Latest products
Live4 published products have passed the complete review.
Browse by need
Everyday problems, covered.
Finance
Plan loans, investments, pricing, taxes, and everyday money decisions.
Health & Fitness
Useful personal health estimates for planning, tracking, and better habits.
Math
Fast calculators for percentages, statistics, geometry, and number problems.
Date & Time
Calculate dates, durations, time zones, timestamps, and working days.
Text
Count, clean, transform, compare, and analyze text without uploading it.
Developer
Format, validate, encode, decode, and debug common developer data.
Security
Generate strong credentials and validate identifiers locally in your browser.
Image & Data
Convert images and structured data quickly, privately, and for free.
Edit, organize, inspect, redact, convert and protect PDF documents locally.
SEO & Marketing
Create clean search, social, campaign, and technical SEO assets.
Education
Solve grades, probability, number theory, and classroom calculations.
Connected workflows
Use the next right tool, not another random tool.
Keep one scenario consistent across fees, profit, acquisition, and publishing checks.
Most used
Start with a popular tool.
Shopify Price & Stock Update
Upload your supplier's price list and your store export. Download a safe update file for Shopify — prices and stock only, nothing else touched.
Image & DataMortgage Calculator
Estimate monthly mortgage payments, total interest, and total repayment cost.
FinanceLoan Calculator
Calculate a loan payment schedule from principal, rate, and term.
FinanceCompound Interest Calculator
Project investment growth with regular compounding and contributions.
FinanceROI Calculator
Calculate return on investment and net return from what something cost and what it returned.
FinanceCurrency Converter
Convert major world currencies using current reference exchange rates.
FinanceBMI Calculator
Calculate adult body mass index and see the standard weight category.
Health & FitnessCalorie Calculator
Estimate daily calories using the Mifflin–St Jeor equation and activity level.
Health & FitnessPercentage Calculator
Calculate percentages, percentage shares, and percentage differences.
MathAge Calculator
Calculate exact age in years, months, days, and total elapsed days.
Date & TimeTime Zone Converter
Convert a date and time between popular IANA time zones.
Date & TimeUnix Timestamp Converter
Convert Unix seconds or milliseconds to a human-readable date and back.
Date & TimeBuilt differently
Your answer, not a maze.
Every page is designed around one job. Most tools run entirely on your device, so private text, passwords, and files never leave your browser.
< 10 sec
to a useful answer
214
free tools
0
required accounts
New tools worth knowing about.
It will be a short monthly roundup of new utilities and practical workflows. It has not started yet — leave your address and we’ll tell you when the first issue goes out.