Tools for specific tasks
Start with your task. Each guide opens a working tool with useful settings, reference examples and limits to check before using the result.
Task guides with ready-to-use settings
- PX to REM Converter — Custom Root Font Size
Divide the pixel value by the root font size: at a 16px root, 24px is 1.5rem. Set the calculator's base to your computed html font size; conversion runs in your browser.
- REM to PX Converter — Check Computed Sizes
Multiply rem by the root font size: 1.5rem is 24px at a 16px root and 30px at a 20px root. Use your page's computed html font size. The calculator runs locally.
- REM to PT Converter — CSS & Print Reference
For CSS reference units, pt = rem * rootPx * 72 / 96. At a 16px root, 1rem is 12pt and 1.5rem is 18pt. Conversion stays in your browser; verify the printed output separately.
- Cron Every 5 Minutes — Expression & Next Runs
Use */5 * * * * in a five-field crontab to run at minutes 00, 05, 10 through 55 of every hour. It is tied to clock marks, not five minutes after deployment or completion. This preview uses UTC.
- Cron Weekdays at 9 AM — Monday to Friday
Use 0 9 * * 1-5 for 09:00 Monday through Friday in a five-field crontab. It excludes weekends, but not public holidays. The preview below uses UTC; configure your scheduler's timezone for local 9 AM.
- Compress Image to 200KB — Check the Actual JPG Size
The tool starts with a 200KB target (204,800 bytes). Choose a JPEG, PNG or WebP and it lowers JPEG quality while keeping pixel dimensions. Check the exact output size: a target is not guaranteed, and no file is uploaded by the tool.