# Audio & video - Human page: https://happytails.ai/en/media-tools/ - Markdown: https://happytails.ai/en/media-tools.md - Structured JSON: https://happytails.ai/agents/en/media-tools/index.json - Visibility: public ## Page guide Find the tool you need, then open it to get started. ## All audio & video - [Add subtitles to video](https://happytails.ai/en/media-tools/add-subtitles-to-video/): Add an SRT subtitle track to a video. ([Markdown](https://happytails.ai/en/media-tools/add-subtitles-to-video.md)) - [Change audio speed](https://happytails.ai/en/media-tools/change-audio-speed/): Change audio playback speed while preserving pitch. ([Markdown](https://happytails.ai/en/media-tools/change-audio-speed.md)) - [Change video speed](https://happytails.ai/en/media-tools/change-video-speed/): Speed up or slow down a video and its audio. ([Markdown](https://happytails.ai/en/media-tools/change-video-speed.md)) - [Compress audio](https://happytails.ai/en/media-tools/compress-audio/): Export audio as an MP3 at your chosen bitrate. ([Markdown](https://happytails.ai/en/media-tools/compress-audio.md)) - [Compress video](https://happytails.ai/en/media-tools/compress-video/): Re-encode a video with an adjustable quality setting. ([Markdown](https://happytails.ai/en/media-tools/compress-video.md)) - [Crop video](https://happytails.ai/en/media-tools/crop-video/): Keep a rectangular region of a video. ([Markdown](https://happytails.ai/en/media-tools/crop-video.md)) - [Flac to MP3](https://happytails.ai/en/media-tools/flac-to-mp3/): Convert FLAC files to MP3 with the available format settings. ([Markdown](https://happytails.ai/en/media-tools/flac-to-mp3.md)) - [Increase audio volume](https://happytails.ai/en/media-tools/increase-audio-volume/): Adjust audio gain with a limiter to control peaks. ([Markdown](https://happytails.ai/en/media-tools/increase-audio-volume.md)) - [M4a to MP3](https://happytails.ai/en/media-tools/m4a-to-mp3/): Convert M4A files to MP3 with the available format settings. ([Markdown](https://happytails.ai/en/media-tools/m4a-to-mp3.md)) - [Merge audio](https://happytails.ai/en/media-tools/merge-audio/): Join audio clips in the order you choose. ([Markdown](https://happytails.ai/en/media-tools/merge-audio.md)) - [Merge video](https://happytails.ai/en/media-tools/merge-video/): Join clips into one video with a consistent frame size. ([Markdown](https://happytails.ai/en/media-tools/merge-video.md)) - [Mkv to MP4](https://happytails.ai/en/media-tools/mkv-to-mp4/): Convert MKV files to MP4 with the available format settings. ([Markdown](https://happytails.ai/en/media-tools/mkv-to-mp4.md)) - [Mov to MP4](https://happytails.ai/en/media-tools/mov-to-mp4/): Convert MOV files to MP4 with the available format settings. ([Markdown](https://happytails.ai/en/media-tools/mov-to-mp4.md)) - [MP3 to WAV](https://happytails.ai/en/media-tools/mp3-to-wav/): Convert MP3 files to WAV with the available format settings. ([Markdown](https://happytails.ai/en/media-tools/mp3-to-wav.md)) - [MP4 to MP3](https://happytails.ai/en/media-tools/mp4-to-mp3/): Convert MP4 files to MP3 with the available format settings. ([Markdown](https://happytails.ai/en/media-tools/mp4-to-mp3.md)) - [Mute video](https://happytails.ai/en/media-tools/mute-video/): Remove a video’s audio track. ([Markdown](https://happytails.ai/en/media-tools/mute-video.md)) - [Remove background noise](https://happytails.ai/en/media-tools/remove-background-noise/): Reduce steady background noise in an audio recording. ([Markdown](https://happytails.ai/en/media-tools/remove-background-noise.md)) - [Remove silence](https://happytails.ai/en/media-tools/remove-silence/): Remove pauses below your chosen audio threshold. ([Markdown](https://happytails.ai/en/media-tools/remove-silence.md)) - [Resize video](https://happytails.ai/en/media-tools/resize-video/): Resize a video to your chosen width. ([Markdown](https://happytails.ai/en/media-tools/resize-video.md)) - [Rotate video](https://happytails.ai/en/media-tools/rotate-video/): Rotate a video by 90, 180 or 270 degrees. ([Markdown](https://happytails.ai/en/media-tools/rotate-video.md)) - [Screen recorder](https://happytails.ai/en/media-tools/screen-recorder/): Record a screen or window you choose. ([Markdown](https://happytails.ai/en/media-tools/screen-recorder.md)) - [Trim audio](https://happytails.ai/en/media-tools/trim-audio/): Keep a selected time range from an audio recording. ([Markdown](https://happytails.ai/en/media-tools/trim-audio.md)) - [Trim video](https://happytails.ai/en/media-tools/trim-video/): Export a selected section of a video. ([Markdown](https://happytails.ai/en/media-tools/trim-video.md)) - [Vocal remover](https://happytails.ai/en/media-tools/vocal-remover/): Separate an audio or video clip into vocal and instrumental WAV files using a local Demucs model. ([Markdown](https://happytails.ai/en/media-tools/vocal-remover.md)) - [Voice recorder](https://happytails.ai/en/media-tools/voice-recorder/): Record audio from your microphone. ([Markdown](https://happytails.ai/en/media-tools/voice-recorder.md)) - [WAV to MP3](https://happytails.ai/en/media-tools/wav-to-mp3/): Convert WAV files to MP3 with the available format settings. ([Markdown](https://happytails.ai/en/media-tools/wav-to-mp3.md)) - [Webm to MP4](https://happytails.ai/en/media-tools/webm-to-mp4/): Convert WEBM files to MP4 with the available format settings. ([Markdown](https://happytails.ai/en/media-tools/webm-to-mp4.md)) ## Separate codec changes from edits to the recording A container stores media tracks, while a codec encodes their contents. Trimming, changing volume and separating vocals are different operations from converting the file extension. Choose the required output format and the specific change you want before exporting. ## How to choose your next step Listen or watch a representative section before processing a long file. Check duration, synchronization and channel layout in the result. ## Common questions about audio & video ### Can a louder export repair distorted audio? Increasing volume does not reconstruct clipped peaks and can make distortion more obvious. Compare at a similar listening level and keep the original recording. ### Does vocal removal perfectly separate a song? Source separation estimates components from a mixture. Reverb, backing vocals and overlapping instruments can leave audible artifacts; audition both the vocal and instrumental exports.