Utility Tools
Everyday helpers: unit and time zone converters, date and percentage calculators, timers, planners and trackers, and file tools such as batch rename.
17 free tools. All run in your browser. See the full directory.
Utility 17 tools
- Batch renameRename any batch of files — photos, PDFs, docs, anything — with pattern tokens, regex find/replace, date stamps, case/trim cleanup, and CSV-driven per-file renaming.
- Checklist CreatorCreate multiple reusable checklists with nested sub-items, progress tracking, and manual/daily/weekly auto-reset. Export/import a full JSON backup.
- Countdown timer / stopwatchRun one or several countdowns at once — by duration or target date, each with a shareable link — or a full stopwatch with laps. Optional keep-screen-awake toggle.
- Date difference / age calculatorDays, months, or years between two dates.
- File SorterDrop in a folder or a pile of mixed files and it separates them into lanes by type — images, video, audio, documents, spreadsheets, presentations, archives, code, fonts — then exports sorted into real folders or as a manifest sheet.
- FlashcardsA simple local spaced-repetition-lite study tool that autosaves your decks.
- Focus Session LoggerA minimalist local Pomodoro/focus timer that logs session blocks and daily summaries in your browser only.
- Fullscreen Color TesterSolid fullscreen colors for screen checks.
- Habit TrackerTrack yes/no or count-based habits with streaks and a 13-week heatmap, no account needed. Export/import a full JSON backup.
- ICS Calendar Event ModifierFix a wrong timezone, date, or missing link in a calendar invite (.ics) file without opening a calendar app.
- One-Day PlannerA calm, today-only task list with no streaks or gamification.
- Percentage / tip calculatorPercentages, tip splitting, and quick math.
- Stay AwakeKeep this device awake for a set time or until you turn it off — handles tab-switching and unsupported browsers gracefully.
- Time zone converterCompare a time across zones — real search by city/country/UTC offset, day/night icons, DST warnings, reordering, and a shareable link.
- Unit ConverterLength, weight, temperature, volume, speed, area, and data storage — convert between any units, all client-side.
- Work Hours CalculatorLog clock-in/out times (overnight shifts included) across a week, deduct breaks, apply daily or weekly overtime rules with rounding, and see an estimated paycheck — export as CSV.
- World ClockLive, reorderable clocks for as many cities as you need, with 12/24-hour display, upcoming DST alerts, and a suggested 9am–5pm overlap window once you add a few.