Video Volume Booster-PlainLoud

PlainLoud is a video volume booster that makes the sound of a quiet video louder and clearer, and saves it back to your gallery. Pick a video, push the volume up, listen to the result, save. Every feature is free: no watermark, no ads, no sign-up, no trial, no subscription and no in-app purchases.

WHAT IT DOES
• Volume boost up to +30 dB, or turn it down by up to 10 dB.
• Auto loudness: measures your video and sets the boost for you (−16, −14 or −11 LUFS).
• Prevent distortion: a look-ahead limiter keeps loud moments from crackling when you boost.
• Hear it before you save: the live preview uses exactly the same sound processing as the saved file. Switch between Original and Edited to compare.
• 6-band equalizer (±15 dB) with presets: Voice clarity, Bass boost, Treble boost, Music, Podcast, Less harsh, Phone speaker, Night. Save your own presets.
• Even out loud and quiet parts (compressor), cut low rumble (wind, hum, handling noise) and mono (fixes sound that only plays on one side).
• The picture is not touched: the video stream is copied as it is, so quality and size stay the same. Only the sound is re-encoded.
• Proof it worked: after saving, PlainLoud measures the new file and shows loudness and peak before and after.
• Save as video (MP4), audio only (M4A or WAV), or remove the sound from a video.
• Works with long videos: files are streamed, not loaded into memory.
• Boost audio files too (MP3, M4A, WAV and more).
• Share a video to PlainLoud from your gallery or files app.
• Light and dark theme.

Use it to increase video volume, boost the sound of a quiet clip, boost MP3 volume or fix audio with the video equalizer.

PRIVATE BY DESIGN
No account, no ads, no analytics and no internet permission. Everything happens on your phone. PlainLoud needs no storage permission: you pick files with Android's own picker, and saved files go to Movies/PlainLoud or Music/PlainLoud. Your original file is never changed.

HONEST LIMITS
• Boosting can't recover sound that was never recorded: very distant voices get louder, and so does the background noise.
• If a video has several sound tracks, the first one is used.
• Keep PlainLoud open while it saves.