About Utilza
Utilza is a set of free online tools for time, dates, percentages, data sizes, text, images, audio, PDFs and developer tasks. Here is who builds them and how results are checked.
Why these tools exist
Utilza brings routine tasks into one site: adding hours on a time card, counting working days, converting data sizes and inspecting files. Tool pages explain the method and limits so you can judge the result before using it.
Audio tools for recordings and music
The Audio Tools category covers format conversion, editing and music practice. Use the Audio Converter to change file formats, MP3 Cutter to trim a recording, or BPM & Key Finder to estimate tempo and musical key.
Audio Transcription turns supported recordings into editable text on compatible WebGPU devices. Audio processing stays in your browser. The speech model may download on first use; browser support, file duration and available memory affect what can run. Transcripts, tempo and key estimates need review.
Who builds Utilza
Utilza is built and maintained by an independent full-stack developer. The Utilza Team page describes the technical background, calculation methods and limits of that work.
How the tools are built and tested
Tool pages explain their inputs, processing steps and limits. Calculators define the variables in each formula so you can check the result by hand. The repository contains automated tests for worked calculator and converter examples, alongside checks for file and data tools. Test coverage varies by tool; it does not establish that every example is tested or that every production release runs a particular gate.
Date tools describe Gregorian calendar rules, including leap years and month ends. Audio transcripts, BPM and key estimates need review. Financial and health calculations are general estimates and are not personalized professional advice.
Where your inputs are processed
Most calculators, converters and file tools process entered values and local files in your browser.
Tools that read a live page or domain, run DNS or network checks, or send an API request use a server. Load From URL tries the address in your browser first and may use our server as a fallback. The Internet Speed Test connects to M-Lab. Read the privacy policy for processing routes, external services and retention details.
Found a wrong result?
Tell us through the contact page. Include the tool, the values you entered, and the result you expected, and we will look into it.