Video & Creators

A toolkit for video creators, streamers and podcasters — edit, convert and resync subtitles, generate valid YouTube chapters, design thumbnails, calculate bitrate and aspect ratios, run a teleprompter, and trim a clip to a seamless loop. Your media is processed in the browser and never uploaded.

9 Video & Creators tools

• Subtitle Editor, Converter & Resync — Edit, convert (SRT/VTT/SBV/ASS/LRC) and resync captions — offset & frame-rate fixes.
• YouTube Chapter & Timestamp Generator — Build a valid YouTube chapters block — checks the 0:00 / 3+ / 10s activation rules.
• Teleprompter — Scroll your script hands-free — adjustable speed, mirror mode & fullscreen.
• Video File Size & Bitrate Calculator — Calculate video file size from bitrate & duration, get the recommended bitrate, with platform presets.
• Resolution Scale & Aspect Ratio Calculator — Scale a resolution by percentage, compute dimensions for any ratio, reduce W×H to a ratio, crop to every platform.
• Video to GIF Maker — Turn a clip into an animated GIF — pick a range, fps, size & caption. Fully in-browser.
• Thumbnail Maker & Editor — Grab a video frame or image, add bold text & overlays, then preview it in YouTube — export 1280×720.
• Metronome & Instrument Tuner — A precise metronome plus an instrument tuner (guitar, bass, ukulele, violin, cello & more) with adjustable A4, reference tones, and exact note + cents — all on your device.
• Audio Spectrogram & Waveform — Open an audio file or use your mic to see a spectrogram & waveform — playback, log/linear scale, perceptual colour maps, exact Hz/note/dB readouts, PNG & CSV export. Nothing uploaded.