PrivateMedia is a professional, high-performance media processing ecosystem and a core pillar of the Kopivo Suite. It operates under a strict Zero-Knowledge architecture, bringing the entire FFmpeg processing pipeline — video, audio, and privacy tools — directly into the user's browser via WebAssembly (WASM).
The world's first serverless, privacy-first media suite. Powered by FFmpeg.wasm. No uploads, no servers, 100% private.
- The Problem with Cloud Media Tools
- How PrivateMedia Works (FFmpeg.wasm)
- Available Local Tools
- Tech Stack
- Privacy & Security Protocol
- Future Vision
Legacy platforms like Clideo, Kapwing, and Adobe Express rely on the same broken "Upload-Process-Download" model. With media files, this becomes even more dangerous:
- Privacy Breaches: Video files contain embedded metadata — GPS coordinates, device identifiers, timestamps — sent directly to third-party servers.
- Prohibitive File Sizes: A 4K video upload can take minutes and consume significant bandwidth, only to be stored on a server you don't control.
- Subscription Paywalls: Server infrastructure costs are passed directly to you via forced subscriptions and file-size limits.
- Data Retention Risk: Many platforms retain your media files long after processing, creating permanent privacy liabilities.
PrivateMedia eliminates the server, eliminating every one of these risks.
PrivateMedia compiles the full FFmpeg binary to WebAssembly, executing it inside a secure browser sandbox at near-native speed. No plugins. No extensions. No server roundtrips.
- FFmpeg.wasm Engine: The industry-standard multimedia framework, recompiled to run entirely in the browser.
- Edge Computing: Your device's CPU handles all encoding, decoding, and transformation.
- Data Sovereignty: Your video and audio files never leave your RAM. Only static assets (HTML/JS/WASM) are served by our CDN.
- Zero-Footprint: When the tab closes, all traces of your media are automatically wiped from volatile memory.
- Svelte 5 + Runes: The UI is built with Svelte 5's reactivity system (Runes), delivering a fast, lightweight, zero-overhead interface.
| Tool | Description |
|---|---|
| Compress Video | Reduce file size without perceptible quality loss using FFmpeg's CRF encoding. |
| Cut Video | Trim any segment from a video with frame-accurate precision, no re-encoding required. |
| Video to GIF | Convert any video clip to an optimized, looping GIF directly in the browser. |
| Change Resolution | Upscale or downscale to any standard resolution (4K, 1080p, 720p, 480p, etc.). |
| Change Speed | Speed up or slow down video playback from 0.25x to 4x. |
| Mute Video | Strip the audio track from any video file instantly. |
| Repair Video | Attempt to recover and rebuild corrupted or incomplete video containers. |
| Capture Frame | Extract any individual frame from a video and export it as a high-quality image. |
| Tool | Description |
|---|---|
| Convert Format | Transcode between MP3, AAC, OGG, FLAC, WAV, and more. |
| Extract Audio | Demux and export the audio track from any video file. |
| Normalize Volume | Automatically balance audio levels to a target loudness (LUFS). |
| Join Audios | Concatenate multiple audio files into a single seamless track. |
| Compress Audio | Reduce audio file size by adjusting bitrate and codec settings. |
| Tool | Description |
|---|---|
| Remove Metadata | Strip all embedded metadata (EXIF, GPS, device info) from video and audio files. |
| Add Watermark | Overlay a custom image or text watermark at any position and opacity. |
| Add Subtitles | Burn SRT/VTT subtitle tracks directly into the video stream. |
| Rotate Video | Rotate or flip video orientation without re-encoding the full stream. |
| Thumbnail Mosaic | Generate a visual contact sheet of frames for quick video preview and cataloging. |
| Custom Command | Execute raw FFmpeg commands directly in the browser for advanced users. |
| Layer | Technology |
|---|---|
| UI Framework | Svelte 5 (Runes reactivity system) |
| Media Engine | FFmpeg.wasm (FFmpeg compiled to WebAssembly) |
| Runtime | WebAssembly (WASM) in browser sandbox |
| Threading | SharedArrayBuffer + Web Workers (multi-threaded WASM) |
| File I/O | Browser File API + Blob URL download |
| Styling | Scoped Svelte styles + CSS custom properties |
| Distribution | Static CDN — zero backend, zero database |
PrivateMedia operates on a No-Log, No-Cloud mandate across all 19 tools:
- Local Intake: Files are accessed exclusively via the browser's native File API. No
<input>data is ever transmitted. - In-Memory Processing: The FFmpeg.wasm module performs all transformations inside a secure, sandboxed Web Worker. The main thread only receives the final output blob.
- Instant Output: The browser triggers a local Blob URL download. No data is ever sent to a backend.
- Metadata Awareness: Unlike cloud tools, PrivateMedia actively surfaces and strips metadata from your files — it never reads it for profiling.
PrivateMedia is one pillar of the broader Kopivo privacy-first productivity suite:
| Product | Focus | URL |
|---|---|---|
| Kopivo PDF | PDF management & editing | pdf.kopivo.com |
| Kopivo Media | Video & audio processing | media.kopivo.com |
| Kopivo Security | Cryptography & privacy tools | security.kopivo.com |
| Kopivo Devs | Developer toolkit | devs.kopivo.com |
PrivateMedia is built to make the web private again — one file format at a time.
- Star this Repo: Help professionals find a secure alternative to cloud-based media editors.
- Spread the Word: Share with video editors, journalists, lawyers, and anyone handling sensitive media.
- Feedback: Reach out via media.kopivo.com for feature requests or technical inquiries.
Precision. Privacy. Performance. © 2026 Kopivo.