Free · fast · privacy-minded
Useful answers,
without the clutter.
Calculators, converters and file tools that explain their work. No accounts. No uploads where your browser can do the job.
No signupOpen a tool and get to work.
Local where possibleFiles stay on your device.
Transparent resultsFormulas and limits included.
Launch collection
Pick a tool. Get it done.
Each utility is tested, mobile-friendly and accompanied by the assumptions you need to use the result sensibly.
Compress images Compress JPG, PNG or WebP images locally in your browser. Merge PDFs Combine multiple PDF documents in the order you choose. Percentages Calculate a percentage of a number, percentage change, or percentage difference with the formula shown. Date difference Find the signed number of days, weeks and calendar span between two dates. Convert units Convert common metric and imperial units with full precision and readable results. Create a QR code Generate a downloadable QR code for a URL or short text. Count words Count words, characters, sentences, paragraphs and estimated reading time as you type. Format JSON Validate, format and minify JSON locally with clear parse-error messages. Build UTM links Build a properly encoded campaign URL with source, medium, campaign and optional UTM parameters. Margin & markup Convert between cost, selling price, profit, gross margin and markup without confusing the two percentages. Journey fuel cost Estimate fuel used and journey cost from distance, consumption and fuel price. Heat pump cost Estimate heat-pump electricity use and compare running cost with gas, oil or another fuel. EV charging cost Calculate energy drawn from the grid and the cost of charging an electric car between two charge levels. 3D print cost Estimate filament, electricity, hands-on labour and failed-print allowance for an FDM part. CNC cycle time Estimate machining cycle and total batch time from cutting length, feed, rapids, tool changes and setup. Concrete volume Calculate concrete volume for a rectangular slab and add a practical waste allowance and bag estimate.
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A growing utility bench.
We release tools only after their calculation, content, accessibility and mobile experience have been reviewed.
5 live Everyday calculators Quick, dependable answers for percentages, dates, journeys and common projects. 2 live Home & energy Make energy costs and electrification choices easier to understand. 1 live Business & finance Practical pricing, profitability and planning tools for independent work. 3 live File & image Private, browser-based file tools. Your files stay on your device. 1 live Developer tools Fast formatters, converters and diagnostics designed for repeat use. 1 live Text & writing Measure and transform text without uploading it to a server. 2 live Manufacturing Transparent estimators for making, machining and material planning. 1 live Productivity & marketing Small utilities for campaigns, planning and focused work.