Video Converter
A video that won't play is almost always a format problem, not a broken file. Your phone shoots MOV, a download arrives as MKV, an old camera saved AVI, and the device or site in front of you only wants MP4. FluidConvert converts between MP4, MOV, MKV, AVI, WEBM, WMV, FLV and more right in your browser — free, no account, files up to 1GB.
Drop your file here, or browse
Accepts: video/* · Max 1GB · always free
Your files are encrypted with TLS and automatically deleted after conversion.
Simply upload your .VIDEO file and we'll convert it to .VIDEO format — fast, free, and secure.
Fast & Free
Convert files up to 1GB completely free. No account, no limits.
Secure
Files are encrypted and automatically deleted after conversion.
High Quality
Industry-leading conversion with no quality loss.
How to Convert VIDEO to VIDEO
Upload Your File
Click the upload area above or drag and drop your .VIDEO file. We support files up to 1GB, completely free.
Choose Output Format
Select .VIDEO as your target format. Adjust any conversion settings if needed.
Download Your File
Click Convert Now and wait a few seconds. Once complete, download your converted file instantly.
About Video Converter
Container vs. codec — why videos really fail
A video file has two parts: the container (the .mp4 / .mkv / .mov wrapper you see) and the codec (the actual compression inside, like H.264, H.265/HEVC, or VP9). Most playback failures happen because a device supports the container but not the codec inside it — for example, an MKV holding H.265 that an older TV can't decode. Converting re-wraps and, when needed, re-encodes the video into a combination the target device understands, which is why a 'broken' file suddenly plays after conversion.
Which format should you convert to?
MP4 (H.264) is the safest universal choice — it plays on virtually every phone, browser, TV, and editor, and it's the right pick for sharing, uploading, or email. Choose WEBM for embedding video on a website, where it's smaller and natively supported by browsers. Choose MOV if you're staying inside Apple's ecosystem or editing in Final Cut. Use MKV when you want to keep multiple audio tracks and subtitles in one file. Reach for AVI or WMV only when a specific older Windows program demands them.
What conversion does to quality and size
Re-encoding video is lossy: each pass discards some detail to save space. Converting between modern codecs at sensible settings keeps the difference invisible for normal viewing, but converting an old highly-compressed clip and then compressing again will show artifacts in fast motion. File size depends mostly on resolution and bitrate, not the container — a 1080p MP4 and a 1080p MKV of the same footage are roughly the same size. If your goal is a smaller file rather than a different format, a dedicated video compressor is the better tool.
How FluidConvert handles it
Your video is processed on cloud servers with hardware-accelerated encoders, so even large files convert in a fraction of the time a phone or laptop would take — without draining your battery or heating up your machine. Uploads are encrypted in transit and deleted automatically after conversion. Nothing is stored, watched, or shared.
Common reasons to convert VIDEO to VIDEO
- Converting iPhone MOV recordings to MP4 so they play and upload everywhere
- Fixing downloaded MKV files that won't open on a TV, console, or older media player
- Converting old AVI or WMV camcorder footage into a modern, editable format
- Preparing video as WEBM for fast, native playback on a website
- Turning any video into MP4 before uploading to platforms with strict format requirements
Frequently Asked Questions
What's the best format to convert video to?
MP4 with the H.264 codec, in almost every case. It plays on the widest range of devices, browsers, and platforms, balances quality and file size well, and is accepted by every major social and video site. Only pick something else when you have a specific reason — WEBM for websites, MOV for Apple editing, MKV for multi-track files.
Will converting reduce my video's quality?
Any format change that re-encodes the video is technically lossy, but at standard settings the loss is imperceptible in normal viewing. Quality only becomes noticeable if you repeatedly convert and recompress the same clip, or convert up from a low-quality source — converting can't add detail that isn't there.
Why does my MKV or MOV file play on one device but not another?
Because support depends on the codec inside the container, not just the file extension. A device may handle the MKV container but lack the H.265 decoder inside it. Converting to MP4/H.264 swaps in a near-universally supported codec, which is why the converted file plays where the original wouldn't.
Can I convert a video without losing the audio?
Yes. Conversion preserves the audio track and keeps it in sync with the video. For files with multiple audio tracks or subtitles (common in MKV), converting to a single-track format like MP4 keeps the primary track — use MKV-to-MKV or keep the original if you need all tracks.
How large a video can I convert?
Up to 1GB per file, completely free and with no limit on how many you convert. For very long 4K recordings that exceed 1GB, compressing first or trimming the clip will bring it under the limit.