We’ve just shipped something a lot of you have been asking for: dedicated video converter tools, alongside the compressor. Until now, RedPandaCompress only did one thing — shrink a video’s file size. Now it can also change a video’s format, converting MOV, MKV, AVI and WebM files into universally-playable MP4, with the same privacy guarantee that got you here in the first place: nothing ever leaves your browser.
Why a Separate Converter?
Compressing and converting are two different jobs. Compression takes a video and makes the same format smaller. Conversion takes a video and changes its container — for example turning an iPhone .MOV into a .MP4 that Windows, Android and every messenger app can actually open. Plenty of people don’t need a smaller file; they just need the right format. So we built five new pages that do exactly that, with zero upload and zero quality loss whenever it’s possible to avoid it.
What Makes It Different
- 100% local. Conversion runs in your browser via WebAssembly FFmpeg — your file is never uploaded to a server, so there’s no queue, no wait, and no privacy tradeoff.
- Lossless when possible. If your source video already contains H.264 (true for most iPhone, GoPro and camera footage), the converter simply repackages the streams into MP4 without re-encoding — identical quality, and multi-gigabyte files finish in seconds instead of minutes.
- Handles the hard cases too. HEVC, VP8, VP9, AV1 and other codecs are decoded and re-encoded to H.264 automatically, so the output plays everywhere even when a fast remux isn’t possible.
- Free and unlimited. No watermark, no signup, no daily cap — up to 8GB per file on desktop (2GB on mobile).
The Five New Tools
Each format gets its own dedicated converter, tuned for the quirks of that format, plus a universal hub page that accepts anything:
- MOV to MP4 — for iPhone, iPad, GoPro and Mac footage. Most MOV files already use H.264 video, so they convert losslessly in seconds; HEVC (H.265) clips are automatically re-encoded.
- MKV to MP4 — for screen recordings and downloaded files that phones, TVs and editors refuse to open. Keeps the video track and first audio track.
- AVI to MP4 — for legacy footage using old codecs like DivX, Xvid or MJPEG. Re-encodes to H.264 at a bitrate that preserves the source’s visual quality.
- WebM to MP4 — for browser screen recordings and web downloads (VP8/VP9), converted to H.264 with AAC audio so any editor or device can use them.
- Universal Video Converter — the hub page. Drop in MP4, MOV, MKV, WebM, AVI or WMV and get back a standard MP4, no matter which format you started with.
How It Decides: Remux or Re-encode?
| Source video codec | What happens | Speed |
|---|---|---|
| H.264 (most phones, GoPros, cameras) | Streams are rewrapped into MP4, no re-encoding | Seconds, even for multi-GB files |
| HEVC / H.265 | Decoded and re-encoded to H.264 | Roughly real-time on a modern computer |
| VP8 / VP9 / AV1 | Decoded and re-encoded to H.264 | Roughly real-time, parallelized across workers |
| Old codecs (DivX, Xvid, MJPEG, WMV/VC-1) | Decoded and re-encoded to H.264 | Roughly real-time |
You don’t have to know any of this ahead of time — drop your file in and the converter figures out the fastest safe path automatically.
Converter vs. Compressor: Which Do You Need?
Use the converter when the problem is compatibility — a file that won’t open, upload or play because it’s in the wrong format. Use the compressor when the problem is size — a file that’s already in a fine format but too large to email, message or upload under a platform’s limit. Both tools run in your browser with the same no-upload, no-signup approach, and each links to the other so you can jump straight to the right one.
FAQ
Is the new converter free, like the compressor?
Yes — completely free and unlimited, with no watermark, signup or daily quota. Because everything runs on your own device instead of our servers, there’s no processing cost to pass on.
Will converting change my video’s quality?
Not if your source is already H.264 — those files are rewrapped, not re-encoded, so quality is identical. Other codecs are re-encoded to H.264 at a bitrate chosen to preserve the source’s visual quality, which is visually lossless for the vast majority of clips.
Which formats can I convert from?
MOV, MKV, AVI, WebM and WMV, all converting to MP4 with H.264 video and AAC audio — the combination that plays on essentially every device and platform. Use the dedicated page for your format, or the universal converter if you’re not sure.
Can it convert MP4 into other formats?
Not yet — output is always MP4, since that’s the format that plays everywhere without a second thought. If your MP4 is fine format-wise but too big, use the compressor instead.
Try it on your next stuck file: MOV to MP4, MKV to MP4, AVI to MP4, WebM to MP4, or the universal converter if you’re not sure which one you need.
Fei is a skilled software engineer. He previously worked at Google and now at a startup. His expertise includes web media processing, cloud architecture, complex algorithms, and AI training and deployment. Beyond work, Fei enjoys diving into new knowledge and is a big fan of strategy games.
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