tools.rus.io is a growing collection of free, browser-based utilities for makers, developers, designers, and anyone who needs a quick answer without signing up or installing software.

Most tools run entirely in your browser — your files and data stay on your device. No accounts, no paywalls, no watermarks.

Everyday & finance

- Tip, bill split, percentage, discount, age, and date calculators

- Mortgage, compound interest, ROI, and currency converter

Developer & text

- JSON formatter & validator

- Regex tester

- Word counter

- Markdown to PDF converter

Image & design

- Image compressor

- Background remover (runs locally via WASM — full resolution, no upload)

- Favicon generator

- QR code generator

Privacy & security

- Password generator (cryptographically secure, nothing stored)

- EXIF viewer & stripper (real ExifTool in the browser)

Audio & media

- Audio transcriber (Whisper runs locally — Opus, MP3, WAV → text)

- Spectrogram analyzer & transcode detector

- FLAC integrity verifier, CUE sheet validator, MP3 encoder detector

- EAC/XLD log checksum checker, fake hi-res detector, .torrent inspector

- X media downloader

Specialist

- US supplement facts panel generator (FDA-style labels from markdown)

- ISO country codes reference

- Privacy-first — sensitive tools (audio, images, passwords, EXIF) process files locally

- No friction — open a URL and use it; no signup, no app store

- Actually useful — each tool targets a real job, not a gimmick

- Fast — lightweight pages, heavy models load only where needed

New tools ship regularly.