● Free · in your browser · nothing uploaded
Convert and edit video without uploading it.
Drop a video — or many at once — pick a preset or set every option, download. Haven Converter runs the whole job on your device — so a 4 GB 4K clip is as private as a note on your desk.
Multiple files at onceNo sign-upNo watermarkNo file limitWorks offline
Quick convert · single or multiple files
All tools
Edit video on a timeline — in your browserA multi-track editor with zero upload. Edit video on a multi-track timeline in your browser: arrange clips, add music, images and titles, then export MP4/WebM. Nothing is uploaded.Convert 4K video to 1080pCrisp Full HD output, downscaled on your device. Downscale 4K (2160p) video to Full HD 1080p right in your browser. Hardware-accelerated where your device allows, with nothing uploaded.Compress video without uploadingSmaller files, your privacy intact. Shrink video file size locally by lowering resolution and bitrate. No upload, no watermark, no account — runs on your device.Convert MP4 to AVILegacy AVI output, made privately. Convert MP4 to AVI locally in your browser. AVI runs on a CPU (WASM) engine — slower, but completely private with no upload.Merge & join videosStitch clips end-to-end, locally. Join two or more clips into one video in your browser. Mismatched resolution, frame rate and codec are normalized automatically. Nothing uploaded.Crop video & change aspect ratioReframe for any platform, live. Crop video and change aspect ratio (16:9 ⇄ 9:16 ⇄ 1:1) in your browser with a live preview. Letterbox or crop. No upload.Add music to a videoScore your clip, privately. Add background music to a video, mix it with the original audio at your chosen levels, or replace the audio entirely. Local & private.Add a watermark or logo to videoBrand your video on your device. Overlay a logo or watermark (PNG with transparency) on your video — choose position, size and opacity. Live preview, no upload.Make a side-by-side videoTwo clips, one frame. Put two videos in one frame — side by side, stacked, or picture-in-picture — playing simultaneously, with both audio tracks mixed. Local & private.
Studio
🎛️Converter with full settingsCodec, container, resolution, aspect and fit, quality or exact bitrate, frame rate — plus trim, watermark, audio and side-by-side composite. Batch a whole folder. 🎬Multi-track timelineLayer clips, images, music and titles; trim, split, transitions, speed, PiP, waveforms, autosave — export 16:9, 9:16, 1:1 or 4:5.
Guides
Compress a video for WhatsApp — no app, no uploadConvert 4K to 1080p on a Mac — free, no installMOV to MP4 — without uploadingVertical 9:16 video for Reels, Shorts & TikTok
Why Haven Converter
🔒Nothing is uploadedYour files are processed in this browser tab on your own machine. No server, no account, no telemetry of your media.
⚡GPU where it’s realWebCodecs + WebGPU on capable browsers, and an honest badge tells you whether a job ran on hardware or software.
∞Big files welcomeMulti-gigabyte 4K is the normal case. Processing streams to disk to keep memory in check.
🧰One integrated studioQuick presets here, full converter and timeline editor one click away — same engines, same look.
How it works
- Open. Drop a video. It is read straight from your disk — never sent over the network.
- Edit. Pick a preset, or build a timeline; the live preview shows exactly what will render.
- Export. The result is encoded on your device and saved to your downloads or a folder you choose.
Read more about how it works →
Frequently asked questions
- Is Haven Converter really free?
- Yes. Every tool is unlimited and completely free — no sign-up, no payment, no watermark on your output.
- Are my videos uploaded to a server?
- No. Decoding, editing and encoding all run in your browser with WebCodecs, WebGPU and a self-hosted ffmpeg.wasm fallback. Your files never leave your device.
- How big a file can I handle?
- Multi-gigabyte 4K is the normal case. Output streams to disk as it is produced, so memory stays flat.
- Which browsers work?
- Chrome, Edge, Firefox and Safari all pass our self-test. Chromium browsers get the fastest GPU path.