Video & Audio

Estimate a video or audio file's size from bitrate and duration — or find the bitrate you need to hit a target size (e.g. under 25 MB for Discord or email).

Standard video resolutions (720p to 8K) and the right size, aspect ratio and bitrate for YouTube, TikTok, Instagram Reels, Shorts and more.

Convert subtitles between SRT and WebVTT formats — fix timestamps, renumber cues and download a file ready for YouTube, HTML5 video or your editor.

Fix out-of-sync subtitles — shift every SRT or VTT timestamp earlier or later by any number of seconds, or stretch timing to fix drift.

Format and validate YouTube chapter timestamps for your video description — checks the rules (start at 0:00, at least 3 chapters, 10 seconds each).

See the notes in any chord — major, minor, 7th, maj7, sus, dim, aug, 9ths and more — with correct spelling and intervals, for guitar, piano and ukulele.

Find the notes of any scale — major, minor, pentatonic, blues and all modes — plus the chords in the key with Roman numerals.

Put a soundtrack on your video — replace the original sound or mix music underneath it, with volume controls and an automatic fade-out.

Convert audio to MP3 or WAV — M4A, OGG, FLAC, WAV, AAC — and extract MP3 audio from MP4, MOV and WebM videos. Batch convert in your browser.

Cut and trim audio online — drag to select the part you want, add fade in and fade out, and save as MP3 or WAV. Great for ringtones and clips.

Join several audio files into one — in any order, with an optional crossfade between tracks — and save as MP3 or WAV.

Normalize loudness to broadcast and streaming targets — −14 LUFS for Spotify/YouTube, −16 for podcasts, −23 for EBU R128 — measured to the ITU-R BS.1770 standard.

Speed up or slow down audio from 0.5× to 2× — keep the original pitch (time-stretch) or change it like a tape — for podcasts, lessons and practice.

Turn audio into a shareable video with an animated waveform, title and cover image — perfect for promoting podcast clips on social media.

Burn SRT or VTT subtitles permanently into a video — adjustable size, color and outline — so captions show on every platform.

Speed up or slow down a video from 0.25× to 4× — with audio kept in sync and pitch preserved — for time-lapses and slow motion.

Crop the frame of a video — remove black bars, zoom in on a subject, or cut to square, vertical or widescreen — and download MP4.

Make beats in your browser — a 16-step drum sequencer with kick, snare, hi-hats, clap and more, preset patterns, swing and tempo — and export your loop as WAV/MP3.

Repeat a video clip 2 to 20 times — or ping-pong forward and back — to make longer loops for backgrounds, stories and presentations.

Join several video clips into one MP4 — in any order, even with different sizes and formats — right in your browser.

A precise online metronome — 20 to 300 BPM, time signatures, accented downbeats, subdivisions and tap tempo — for practice on any instrument.

Remove the sound from a video instantly — no re-encoding, no quality loss — and download the silent MP4.

Tune your guitar, ukulele, bass or any instrument with your microphone — see the note, the frequency and how many cents sharp or flat you are.

Change the pitch or key of a song by semitones without changing its speed — transpose for singing, practice or tuning — then download.

Fit any video to 9:16 (Reels, TikTok, Shorts), 1:1, 4:5 or 16:9 — with blurred background, solid bars, or crop to fill — without distortion.

Play any audio backwards — reverse songs, voice messages and sound effects — and download the reversed file as MP3 or WAV.

Play a video backwards — reverse the picture (and optionally the sound) for fun effects and rewinds. Best for short clips.

Rotate a video 90°, 180° or 270°, or flip it horizontally or vertically — fix sideways phone videos in seconds.

Record your screen, a window or a browser tab — with optional microphone — right in your browser, then download the video. No install, no watermark.

Automatically cut silent gaps from podcasts, voice notes and lectures — set the threshold and minimum pause, keep a natural breath, and save the tighter audio.

Turn photos into a video slideshow — set seconds per photo, add music and choose 16:9, 9:16 or square — and download MP4.

Measure noise levels with your microphone — live decibel reading, peak, average and a history graph — with calibration and noise-exposure guidance.

See sound frequencies live from your microphone — real-time spectrum bars and a scrolling spectrogram, with the loudest frequency and note shown.

Dictate with your microphone and see the text appear live — in dozens of languages — then copy or download it. Works in Chrome, Edge and Safari.

Put two videos side by side or one above the other — for reactions, comparisons and duets — and download a single MP4.

Find the BPM of any song by tapping along — tap a key or the button on each beat to see beats per minute instantly, plus delay times in milliseconds.

A free online teleprompter — paste your script and it scrolls smoothly at your speed, with large text, mirror mode, a reading guide and full screen.

Have any text read aloud with natural voices — choose the voice, language, speed and pitch. Free, private and runs in your browser.

Play a pure tone at any frequency from 20 Hz to 20 kHz — sine, square, triangle or sawtooth — or sweep the range to test speakers and hearing.

Compress videos to share by email, WhatsApp or Discord — choose a quality level or a target size in MB, and optionally lower the resolution. Runs in your browser.

Convert videos between formats — MOV, MKV, AVI, WMV, FLV to MP4, or MP4 to WebM — for playback everywhere and on websites.

Save any frame of a video as a high-quality image, or extract frames every N seconds — plus see the video's resolution, duration and frame size.

Turn a video clip into a high-quality animated GIF (with an optimized palette), or convert a GIF into a much smaller MP4.

Cut the start and end off a video, or keep just one part — frame-accurate trimming or instant lossless cuts — then download MP4.

Stamp text or your logo on a video — choose the position, size and transparency — to brand clips before posting.

Make a karaoke / instrumental track by removing center-panned vocals from stereo songs — with the bass kept — right in your browser.

Record your voice or upload audio and apply fun effects — chipmunk, deep voice, robot, alien, telephone, echo, cathedral reverb — then download.

Record your voice or any microphone in the browser — pause, play back and download the recording. No sign-up and nothing is uploaded.

Make quiet audio louder — boost volume by up to +30 dB with a built-in limiter that prevents harsh clipping — then save as MP3 or WAV.

Test your webcam and microphone online — live camera preview, resolution, a mic level meter and quick playback — before your next video call.

Play white, pink or brown noise in your browser for focus, sleep or masking sounds — with volume control and a sleep timer.