# UsefulBasis

Free browser tools with no signup or install: image compression, word counting, world clock, online timer, Base64/URL encoding, loan and compound interest calculators, guitar tuner, metronome, plus practical how-to guides. Korean versions under /ko/.

## Tools

- [Image Compress](https://usefulbasis.com/tools/image-compress/): Compress up to 30 JPG, PNG, or WebP images in your browser. Files never leave your device.
- [Word Counter](https://usefulbasis.com/tools/word-counter/): Count words, characters, sentences, and reading time as you type.
- [World Clock](https://usefulbasis.com/tools/world-clock/): Live world times, a time zone converter, and a meeting overlap finder.
- [Online Timer](https://usefulbasis.com/tools/timer/): Free timer with alarm, start/pause/reset, and a 25-minute Pomodoro preset.
- [Base64 & URL Encoder](https://usefulbasis.com/tools/text-encoder/): Encode and decode Base64 and URL-encoded text client-side, with UTF-8 support.
- [Loan Calculator](https://usefulbasis.com/tools/loan-calculator/): Monthly payments, total interest, and payoff schedule — with extra payment simulation.
- [Compound Interest Calculator](https://usefulbasis.com/tools/compound-interest/): Project how savings grow with monthly compounding over the years.
- [Guitar Tuner](https://usefulbasis.com/tools/guitar-tuner/): Tune with your microphone. Real-time pitch detection, standard tuning.
- [Metronome](https://usefulbasis.com/tools/metronome/): Free metronome with tap tempo. 40–208 BPM with an accented first beat.

## Guides

- [How to shrink multiple photos at once](https://usefulbasis.com/guides/batch-image-compression/): Check upload limits in the order of file size, pixel dimensions, then format.
- [When a file won't open on Mac](https://usefulbasis.com/guides/mac-file-open-default-app/): Fix order — extension, default app, then security warnings.
- [MacBook USB-C hub specs to check](https://usefulbasis.com/guides/macbook-usb-c-hub/): 4K 60Hz, PD charging, and port layout before buying.

## Korean

- [한국어 도구와 가이드](https://usefulbasis.com/ko/): 위 모든 도구와 가이드의 한국어 버전.