Add up hours on a timesheet
Turn one span into decimal hours, project a fixed week through the year, and total a week whose days differ, with overtime and gross pay.
Utilza Team
Utilza is built and maintained by an independent full-stack developer. The same person writes the code for every tool, writes the guides, and checks each result against a worked example before it goes live.
Who builds Utilza
The tools come from everyday work in web development: Laravel and PHP back ends, Linux servers, DNS and network setup, and Android apps. Most of the calculators and converters started as small scripts for that work and were rewritten as browser tools with the formula shown on the page.
How every tool is tested
Each tool page shows the formula or rules it uses, with every variable defined, so you can check a result by hand. The worked examples on each page are also automated tests. If the code and an example disagree, the release is stopped until one of them is fixed.
Sources and review
Unit conversions use exact SI and NIST definitions. Loan, mortgage, and savings calculators use the standard annuity and compound-interest formulas, and follow US conventions unless a page says otherwise. Health calculators follow published formulas from bodies such as the WHO and CDC, and are general estimates, not medical advice. Finance and health pages show the date they were last reviewed.
Report a wrong result
If a result looks wrong, use the contact page. Include the tool, the values you entered, and the result you expected.
Guides by Utilza Team
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Compress images before they go on a page
Resize a photo to the width it is shown, save WebP where the page can use it, and compress with a quality you can compare before you replace the original.
Hidden data in a file you are about to send
Check a photo, a PDF, and a Word, Excel, or PowerPoint file for hidden fields, then download a copy with those fields removed before you send it.
Rent or buy, after you run the numbers
Price your income can carry, the full mortgage, and rent versus buy for the years you plan to stay. The figures are estimates, not a decision.
What a loan costs after the payment looks fine
See total interest on a fixed loan, what extra payments do to a mortgage, and how upfront fees change APR compared with the rate you were quoted.
When the JSON will not parse
Pretty-print JSON that already parses, jump to the line and column when it does not, and open a tree when the document is too deep to scan as text.
When the PDF is the wrong shape
Combine PDFs in the order you choose, extract the pages you need, and drag thumbnails to reorder, rotate, copy, or delete pages. The files stay in your browser.
Make a password, then store the hash
Generate a random password, see what makes it weak, then store the bcrypt string. Argon2id is not available in this tool.