Video & Audio Tools
From video and audio conversion to subtitles and music practice, everything works in your browser.
Audio File Size Calculator
Estimate audio file size from duration and bitrate, or sample rate and bit depth.
Video File Size Calculator
Estimate encoded video file size from length, bitrate, and codec, or find the bitrate that fits a size limit.
Audio Slow Downer & A-B Loop
Slow down or speed up audio and video from 0.25x to 2x without changing pitch, and loop a section between two points.
Chord Transposer & Capo Chart
Pick the original and new key to transpose chords, see diatonic chords, and find guitar capo positions.
Voice Anonymizer
Disguise a speaker's voice in an audio file with pitch shift, a low-pass mask, and noise.
Subtitle Checker
Check subtitle line length, reading speed (CPS) and on-screen time against Netflix, BBC or custom limits. Works with pasted SRT and VTT.
Video File Info Checker
Check a video or audio file's codec, frame rate, HDR type, and audio tracks, and compare them with a delivery spec.
SMPTE Timecode Converter
Convert SMPTE timecode to frames and seconds, and back. Supports drop frame and non-drop frame.
SRT to VTT Converter
Convert SRT to VTT or VTT to SRT, shift subtitle timing, and rescale frame rates in your browser.
Audio File Size Calculator
Estimate audio file size from duration and bitrate, or sample rate and bit depth.
Video File Size Calculator
Estimate encoded video file size from length, bitrate, and codec, or find the bitrate that fits a size limit.
Audio Slow Downer & A-B Loop
Slow down or speed up audio and video from 0.25x to 2x without changing pitch, and loop a section between two points.
Chord Transposer & Capo Chart
Pick the original and new key to transpose chords, see diatonic chords, and find guitar capo positions.
Voice Anonymizer
Disguise a speaker's voice in an audio file with pitch shift, a low-pass mask, and noise.
Subtitle Checker
Check subtitle line length, reading speed (CPS) and on-screen time against Netflix, BBC or custom limits. Works with pasted SRT and VTT.
Video File Info Checker
Check a video or audio file's codec, frame rate, HDR type, and audio tracks, and compare them with a delivery spec.
SMPTE Timecode Converter
Convert SMPTE timecode to frames and seconds, and back. Supports drop frame and non-drop frame.
SRT to VTT Converter
Convert SRT to VTT or VTT to SRT, shift subtitle timing, and rescale frame rates in your browser.
Category Overview
What Video & Audio tools can do for you
9 tools listed
The video and audio tools cover work with moving pictures and sound. Compress and trim video, convert video to GIF and back, turn landscape video into vertical 9:16, extract audio as MP3, WAV or M4A, record your screen and test your camera and microphone.
For subtitles, convert between SRT and VTT with time shifting, check characters per line and display time, burn subtitles into video, and convert timecodes between SMPTE, seconds and frames. You can also estimate output file size and check codec, color space and HDR details.
For audio, cut silence from recordings, measure loudness in LUFS and normalize volume, change pitch to anonymize a voice, change speed without changing pitch, and loop sections. For musicians there are a metronome, BPM tap counter, transposition chart, instrument tuner and MIDI editor.
Handy when you need to
- ✓ Compress a video to a target size for sharing
- ✓ Convert subtitles or fix timing drift
- ✓ Cut silent parts from a meeting recording
- ✓ Check tempo or transposition for practice
Pro tip
Video is large, so processing depends on your device and may take a while. For thumbnails and script-to-video-length conversion, see Social Media & YouTube.
Video & Audio: frequently asked questions
- Q. Are my video files sent anywhere?
- A. No. Conversion and compression run in your browser and the files are never uploaded.
- Q. Why does processing take time?
- A. Your own device does the work instead of a server. Large videos can take a while, so keep the tab open until it finishes.