Free online tools
Free tools that run entirely in your browser: microphone and webcam tests, text and developer utilities, timers and time zone planners. Nothing uploaded.
Quick utilities for everyday work, free and without sign-up. Every tool runs entirely in your browser: your audio, video and text never leave your device, and there are no ads.
Testing your setup before a call? Start with the microphone test and webcam test. Working with text or code? Try the case converter, JSON formatter or UUID generator. Meeting-related calculators live in Hark's meeting tools.
- Case converter Convert text to UPPER, lower, Title, Sentence, camelCase and more.
- Character counter Count characters, words and lines, with limits for social posts.
- Duplicate line remover Remove repeated lines from a list, with sorting options.
- JSON formatter Format, validate and minify JSON in your browser.
- Keyboard tester Press keys to check every key on your keyboard registers.
- Markdown to HTML converter Convert Markdown to clean HTML with a live preview.
- Meeting planner across time zones Find a meeting time that works across cities and time zones.
- Microphone test Check your mic works and see its level, right in the browser.
- Online stopwatch A full-screen stopwatch with laps that keeps running in the background.
- Online voice recorder Record audio in your browser and download it. Nothing is uploaded.
- Reading time calculator Estimate how long a text takes to read silently.
- Remove line breaks Join lines and clean up text pasted from PDFs and email.
- Speech timer Time a speech or presentation with green, yellow and red cues.
- Unix timestamp converter Convert Unix timestamps to dates and back, in any time zone.
- UUID generator Generate random v4 and time-ordered v7 UUIDs in bulk.
- Webcam test Check your camera before a call: picture, resolution and frame rate.
- Words to minutes converter How long a script takes to read aloud, at your speaking pace.