Nothing is uploaded — every file stays on your device
The private video studio that runs in your browser
Compress video, generate AI subtitles, extract audio, convert formats and edit clips — all processed locally with FFmpeg and Whisper running on your own machine. No uploads, no watermarks, no file size caps.
Why processing locally matters
Every mainstream online video tool works the same way: you upload your file, their servers do the work, and you download the result. That model is fine for a holiday clip and genuinely unsuitable for a client interview, an unreleased edit, a patient recording, or anything covered by an NDA. MediaVault removes the upload step entirely, which removes the question of what happens to your file afterwards.
No upload wait
A 2GB file starts processing immediately instead of after a 2GB transfer.
No size caps
There is no server quota to enforce, so your own memory is the only limit.
No watermarks
Output is exactly what FFmpeg produces, with no branding added on top.
No retention
Nothing is stored because nothing is ever sent. Close the tab and it is gone.
The toolkit
21 tools covering the everyday video and audio jobs that usually send people to a converter site.
Video Compressor
Shrink video file size locally with FFmpeg — no upload, no watermark.
AI Subtitle Generator
Auto-generate SRT captions with Whisper running on your own device.
Video to GIF
Turn clips into looping GIFs with control over frame rate and size.
Audio Extractor
Pull the audio track from any video and save it as MP3 or WAV.
Vocal Remover
Separate vocals from backing tracks with local phase cancellation.
Screen Recorder
Record screen or webcam in-browser and keep the file on your device.
Video Resizer
Reformat video to portrait, square or landscape for any platform.
Silence Remover
Detect quiet gaps and auto jump-cut footage for a tighter edit.
Video Converter
Convert MOV, MKV, AVI and WebM to MP4 locally.
Discord Video Compressor
Get any clip under Discord's 8MB or 25MB limit.
Audio Editor
Denoise, pitch-shift and clean up recordings.
How it works
- Pick a tool and drop in your file. The file is read into your browser's memory — the same way opening a document works — not sent anywhere.
- The engine runs on your machine. FFmpeg compiled to WebAssembly handles video and audio work; OpenAI's Whisper model handles transcription.
- Save the result to disk. The output is written straight to your downloads folder. Close the tab and no trace of the job remains.
Simple pricing
The free tier covers 2 operations a day, which is enough for occasional use. Pro removes the limit.
Free
$0
2 operations per day, all 21 tools, local Whisper transcription on the small model.
Pro
$9 / month
Unlimited operations, full HD exports and the larger, more accurate Whisper model. Yearly billing works out at $6 a month — 33% less.
Frequently asked questions
Are my files uploaded anywhere?
No. Every tool reads your file into browser memory and processes it on your own CPU using FFmpeg compiled to WebAssembly. No copy of your media is transmitted to a server at any point.
Is MediaVault free?
Yes, with a daily allowance. The free tier covers 2 media operations per day and the small Whisper transcription model. Pro removes the daily limit and unlocks HD exports and larger AI models.
Does it work offline?
After the first load the processing engine is cached, so the tools continue to work without a connection. Only account features such as billing need the network.
Do I need to install anything?
No. MediaVault runs in a normal browser tab on Chrome, Edge, Firefox and Safari. There is no desktop app to install and no extension to add.
How is this different from an online video converter?
Typical online converters upload your file to their servers, process it there, and hand back a link — often with a watermark, a size cap, and retention terms you did not read. MediaVault never performs that upload, so there is no cap, no watermark, and no third-party copy of your footage.
Guides
- How to compress video for email — Get a video under the 25MB attachment ceiling without uploading it anywhere.
- How to add subtitles to Instagram Reels — Caption a Reel properly — including why auto-captions are not enough.
- How to remove background noise from a podcast — What denoising can fix, what it cannot, and the order to do it in.
- How to add subtitles to video (locally, for free) — Generate and burn in captions without uploading your footage.
- Local AI transcription vs cloud services — Privacy, cost and compliance compared for regulated teams.
Start with a file you would never upload
That is the honest test of whether local processing matters to you.
Open the studio