# Change a Video's Audio Volume Make a video louder or quieter right in your browser — by decibels or a factor, with a clipping-safe limiter. The picture is untouched. Nothing is uploaded, free. ## Run it - **CLI:** `gizza tool video-audio-gain 'url=https://example.com/input' 'amount=6' 'unit=db' 'limiter=true'` - **Web:** https://gizza.ai/tools/video-audio-gain/ - **Agents:** machine-readable descriptor (parameters JSON Schema) at https://gizza.ai/tools/video-audio-gain/tool.json ## Inputs - `file` — Video _(file; accept: video/*)_ - `amount` — Amount _(field)_ - `unit` — Unit _(field)_ - `limiter` — Prevent clipping (limiter) _(field)_ ## Output - Adjusted video (video) ## Query parameters Open the tool pre-filled and auto-run via URL: - `amount` — Amount - `unit` — Unit - `limiter` — Prevent clipping (limiter) - `url` — fetch the input file from a public URL (CORS-permitting) Example: `https://gizza.ai/tools/video-audio-gain/?url=https://example.com/input&amount=6&unit=db&limiter=true` --- ## Make a video louder or quieter Pick a video, choose how much to change its **audio volume**, and get the same clip back — louder or quieter. The picture is **stream-copied** (not re-encoded), so it stays byte-for-byte identical and processing is fast; only the audio track is re-encoded. Everything runs in your browser; nothing is uploaded. ### How much is "a lot"? You can set the change two ways with the **Unit** control: - **Decibels (dB)** — the audio engineer's scale. `+6` roughly doubles the perceived loudness, `-6` halves it. `+10` is a strong boost; `-10` a strong cut. Range: −60 to +60 dB (0 does nothing). - **Factor (×)** — a plain multiplier. `2` is twice as loud (the same as "200%"), `0.5` is half, `10` is a big 1000% boost. Range: greater than 0 up to 16 (1 does nothing). **Worked example:** a screen recording where the narration is too quiet. Load `recording.mp4`, set **Amount** to `6` with **Unit = Decibels**, leave **Prevent clipping** on, and you get `recording-gain.mp4` — same video, audio about twice as loud, with peaks held at 0 dBFS so the boost doesn't distort. ### Prevent clipping (limiter) When you boost, samples that were already near the maximum can be pushed past it and clip (harsh distortion). The **Prevent clipping** option adds a peak limiter that holds the output at 0 dBFS, so boosts stay clean. Turn it off if you want an exact linear gain (for example when measuring levels). ### Notes and limits - The video stream is copied losslessly; the output keeps the same container (mp4 → mp4, webm → webm). WebM audio is re-encoded to Opus, everything else to AAC. - One constant gain is applied to the whole clip — this isn't a timeline/volume automation editor. - Input and output are each capped at 25 MB (the file is processed in your browser's memory). ### FAQ
Is my video uploaded to a server? No — ffmpeg runs inside your browser tab, so the file never leaves your device.
Will boosting the volume hurt the video quality? No. Only the audio is changed; the **picture is stream-copied without re-encoding**, so the video quality is identical to the original.
Can I make the video quieter or completely silent? Quieter, yes — use a negative dB value (e.g. `-10`) or a factor below `1` (e.g. `0.5`). To remove the audio entirely, use the **Mute a Video** tool instead, which drops the audio track completely.
What's the difference between decibels and a factor? They describe the same change on different scales. A factor of `2` (200%) is about `+6` dB; `0.5` (50%) is about `-6` dB. Decibels match how loudness is perceived; a factor is a straight multiplier on the waveform. Pick whichever is more natural for you.
Why does the boost sometimes sound "capped"? That's the **peak limiter** doing its job — it holds the loudest peaks at 0 dBFS so a big boost doesn't clip and distort. If you'd rather have an exact linear gain with no limiting, turn **Prevent clipping** off.
Which video formats can I use, and how big can the file be? Anything ffmpeg can read — mp4, mov, mkv and webm are the common cases. The output keeps the input's container and is named after the original with a `-gain` suffix (e.g. `clip.mp4` → `clip-gain.mp4`). The input and output are each capped at 25 MB.
## Related tools - [Change Audio Volume](https://gizza.ai/tools/audio-volume-adjust/): Boost or cut any audio file's volume right in your browser — by decibels or a factor, with a clipping-safe peak limiter. Nothing is uploaded, free. - [Remove Background Noise from a Video](https://gizza.ai/tools/video-audio-denoise/): Clean up hiss, hum and background noise in a video's audio right in your browser — pick a strength and denoiser. The picture is untouched. Nothing is uploaded, free. - [Change Video Speed](https://gizza.ai/tools/change-speed/): Speed up or slow down a video right in your browser, keeping audio in sync — pick a speed factor (0.25x–4x). Re-encodes locally with ffmpeg, nothing is uploaded, free. - [Extract Video Frames to a Contact Sheet](https://gizza.ai/tools/extract-frames/): Sample frames from a video by interval, fps or scene change and tile them into one contact-sheet image. Free, in your browser with ffmpeg, nothing is uploaded. - [GIF to MP4 / WebM](https://gizza.ai/tools/gif-to-mp4/): Convert an animated GIF into a much smaller MP4 or WebM video, right in your browser. Re-encodes locally with ffmpeg (H.264 / VP9), nothing is uploaded, free.