Free
Image aspect ratio calculator
Reduce a width and height to a ratio or calculate a matching missing dimension.
Creators, designers, marketers and small businesses
Digital & media tools
Resize images, check contrast, estimate files and convert common units locally. Prepare visual and digital assets directly in your browser. Image files are processed locally and are not uploaded by UtilHub.
6free tools in this category.
Choose a tool
Clear inputs. Useful outputs.
Every result stays on your device unless a page explicitly says otherwise.
Free
File size estimator
Estimate audio or video file size from bitrate and duration.
Free
Colour contrast checker
Check foreground and background colours against WCAG contrast thresholds.
Free
Image compressor & resizer
Resize and compress JPEG, PNG or WebP images locally, then download the result.
Free
Unit converter
Convert length, mass, area, volume, temperature, speed, pressure, energy and data units.
Free
Video script timer
Estimate spoken video or voice-over length from script word count and delivery pace.
Step-by-step guidance
Practical guides for these tasks.
Image ratio guide
Calculate and preserve image aspect ratio
Reduce image dimensions to a ratio, calculate a matching width or height, and understand when resizing, cropping or padding changes the frame.
Tile quantity guide
Estimate floor tiles and boxes
Turn room and tile dimensions into whole tiles, boxes and cost with a visible waste allowance.
Fuel economy guide
Convert MPG and L/100 km safely
Convert between UK MPG, US MPG, litres per 100 km and kilometres per litre without mixing gallon standards.
What this category helps with.
Start with the real question
Resize images, check contrast, estimate files and convert common units locally.
See the method
Inputs, formula or processing method, examples and important limitations are explained on every tool page.
Use the answer with context
Prepare visual and digital assets directly in your browser. Image files are processed locally and are not uploaded by UtilHub. Tools give an estimate or transformation; you remain in control of the final decision.
Need a deeper workflow?
Move from a quick answer to a reusable business result.
The Premium suite adds 20 advanced forecasting, audit, data and document tools. Guests can try 1 run; a verified free account gets 3 per rolling 24 hours.