Media
Make GIFs from video at a chosen time range, frame rate and size, or export a single frame. Convert audio to WAV, trim and add fades. Nothing uploaded.
Tools in this category
Video to GIF
Turn part of a video into a GIF with adjustable frame rate, width, colours and looping. Pick the range from the preview; nothing is uploaded.
Video Frame
Export the exact frame at any moment, at the video's own resolution, as PNG, JPEG or WebP. Sharper than a screenshot: no controls, no display scaling.
Audio to WAV
Convert MP3 / M4A / FLAC and more to WAV, with an optional sample rate (16k speech, 48k video), mono downmix and peak normalisation. All in the browser.
Trim Audio
Cut a section out of an audio file by start and end time, with optional fades to remove the click at the cut. Mark points while previewing, export as WAV.
Lottie Preview
Drop a Lottie JSON to play it: adjustable speed, a scrubbable timeline, plus size, frame rate, duration and handoff checks. Nothing is uploaded.
Video to Audio
Extract the audio track from a video as WAV, with a time range, mono downmix, downsampling to 16 kHz and peak normalisation. All local in your browser.
Video Trim
Cut a segment out of a video and re-encode it as MP4 (H.264 + AAC), ready for chat apps or an editor. Everything runs locally in your browser.
Subtitle Converter
Convert between SRT and WebVTT, shift the timeline (fix out-of-sync audio) or scale it (fix frame-rate mismatch). Runs entirely in your browser.
Video Crop
Crop the picture of a video — remove letterboxing, reframe to vertical — and re-encode it as MP4. Crop regions are percentages, so they fit any resolution.
Video Size Estimator
Turn a bitrate into a file size and a capacity into recording time, with GB and GiB conventions and a reality check on intermediate codecs.
Device Test
Test keyboard, mouse, touch, camera, microphone, sensors, battery and gamepads on one page. Unsupported APIs say so instead of showing 0.
Media File Info
Drop in a video or audio file to read its duration, resolution, codec, bitrate and rotation, then export it as JSON. Nothing is uploaded.
Network Monitor
Read page load timing, resource totals, online history and connection estimates. No requests are sent; cross-origin sizes are unknown.
Tone Generator
Online tone generator: sine, square, triangle and sawtooth waves; a frequency in Hz or as a note (A4); left/right channel; exponential sweep; auto-stop.
Notification Test
Ask for permission, send a notification, and see which options really work on your platform. Denied permissions are explained so you can fix them by hand.
Dead Pixel Test
Fill the screen with black, white, the primaries and greys to find stuck pixels, dead pixels and panel uniformity problems.
Text to Speech
Read text aloud with the built-in browser voice: pick a voice, rate, pitch and volume; long text is read sentence by sentence.
Refresh Rate Test
Measure the compositor frame rate this page actually gets and how many frames it drops, with a moving block to show what smoothness looks like.
Typing Speed Test
An online typing speed test with common English words and Chinese sentences: live WPM, CPM and accuracy, with mistakes highlighted as you type.
Metronome
An online metronome: 30-300 BPM, adjustable meter and accent, tap tempo. Beats are scheduled ahead on the audio clock so they do not drift.