NoUpload

Video Converter

Convert and compress video in your browser, from MP4 and MOV to WebM, MKV, AVI and GIF. Nothing is uploaded; your files never leave your device.

🔒 Your file is processed on your device and never uploaded.

Drop almost any video and get MP4, WebM, MOV, MKV, AVI or an animated GIF back, or pull out just the soundtrack as MP3, WAV, AAC, FLAC or OGG. It reads the formats other in-browser converters usually choke on: iPhone and Android video (MP4, MOV, HEVC, 3GP), old camcorder and DVD footage (AVI, MPEG, VOB, M2TS), Windows WMV and ASF, Flash FLV and SWF, Matroska MKV, WebM, Ogg, and more. If it plays on your device, there's a good chance this converts it.

Everything happens inside this page: your file is read from your disk into your browser's memory, converted there, and handed straight back to you. Ordinary online converters upload your video to a stranger's server, convert it there, and keep a copy for some number of hours. In March 2025 the FBI's Denver field office warned that it was increasingly seeing criminals use free online file converters to spread malware, including ransomware. Because your file never reaches a converter's server, that particular risk does not apply here.

How to convert a video

  1. Drop a video onto the box above, or click it to pick a file. Your file stays on your device when you do this.
  2. Choose your output format. MP4 is the safest bet for sharing and playback almost anywhere.
  3. Optionally pick a quality preset and a smaller resolution to shrink the file.
  4. Click Convert, then download the result. Large files take longer because the work happens on your own hardware.

What makes this different

  • Your file is never uploaded. There is no server to upload it to.
  • No account, no email address, no watermark, and no daily limit.
  • Hardware-accelerated conversion where your browser supports it, with an automatic fallback for older formats.
  • AV1 output on supported browsers: next-generation compression that often lands around half the size of H.264 at similar quality.
  • Wide input support: MP4, MOV, MKV, WebM and AVI, plus the trickier ones like HEVC, WMV, ASF, FLV, MPEG, MPG, VOB, M2TS, TS, 3GP, 3G2, OGV, SWF and DivX.
  • Works offline. Once the page and the engine your format needs have loaded, you can turn off your Wi-Fi and it still converts.

Frequently asked questions

Are my videos really not uploaded?
No, and you can prove it yourself: convert a video to MP4 once while online, then switch your device to airplane mode or turn off Wi-Fi and convert another. It still works, because everything needed is already on your machine. Formats that use the compatibility engine, such as GIF output or older files like WMV, download it once on first use; after that they work offline too.
What is the largest file I can convert?
The fast path accepts files up to roughly 4 GB, and the compatibility engine for older formats up to about 2 GB. Animated GIF output is capped at 200 MB of input, because GIFs balloon in size. Those are limits on what we accept, though, not a promise that a file that size will finish. What really decides success is memory: the converted result is held in your device's memory until you download it, so a long or high-quality output can fail well below those limits, and a phone will manage far less than a laptop. We've verified 15-minute 720p and 10-minute 1080p conversions on an ordinary desktop. If a large job fails, try a lower resolution or the 'Smaller file' preset, or run it on a computer.
Why is one conversion fast and another slow?
Most conversions use your browser's built-in hardware video engine, which is very fast. Inputs or outputs that engine cannot handle fall back to a full video engine compiled to WebAssembly. It downloads once and then works for everything, but it runs on the CPU and is noticeably slower. That slower path is used for GIF output, older formats like AVI, WMV and FLV, and often for HEVC video (the format iPhones record), which many Chrome and Firefox installs cannot decode. Safari decodes HEVC natively, so on a Mac or iPhone that footage stays on the fast path.
How do I get the fastest conversion?
Three things keep you on the fast path. First, the browser: H.264 and WebM videos are quick everywhere, but for HEVC video from an iPhone, Safari is the safest bet, since it decodes HEVC natively where many Chrome and Firefox installs have to use the slower engine. Second, size: a lower resolution or the 'Smaller file' quality preset means less to encode, so it finishes sooner and downloads smaller. Third, GIF output and older formats like AVI, WMV and FLV always use the slower engine, so expect its one-time download on first use.
Why did the first conversion pause before the progress bar moved?
Some conversions (GIF output, plus older or HEVC inputs) use a full video engine compiled to WebAssembly. It is about 32 MB and downloads the first time you need it, then stays cached, so later conversions skip the wait. While it downloads and starts up, the progress bar animates to show it is working rather than stuck, and the percentage begins counting once the actual conversion starts. As always, nothing about your file is uploaded during any of this.
Which formats can I convert?
You can convert from almost any common video: MP4, MOV, MKV, WebM, AVI, WMV, ASF, FLV, MPEG, MPG, M1V, MPV, VOB, M2TS, MTS, TS, 3GP, 3G2, OGV, SWF, DivX and HEVC among them. Outputs are MP4, WebM, MOV, MKV, AVI and animated GIF for video, plus MP3, WAV, AAC, FLAC and OGG when you want audio only. If you have a format that doesn't work, tell us and we'll look at adding it.
Does it work on a phone or tablet?
Yes, in any modern browser. Very large files are more likely to run out of memory on mobile than on a laptop, so if a big conversion fails on your phone, try it on a computer or pick a smaller resolution.
How long does converting a video take?
On a typical desktop with hardware acceleration, roughly one minute of processing for every three minutes of 720p video, or every two minutes of 1080p. A 15-minute 720p video takes around 4 to 5 minutes. Phones and older laptops are slower. A live progress bar shows the percentage, elapsed time, and a time-remaining estimate measured from your own device's actual speed.
Why is my converted file bigger or smaller than the original?
Converting re-encodes the video, so the output size depends on the quality preset and resolution you chose rather than on the input. Pick 'Smaller file' or a lower resolution to compress; pick 'Best quality' to stay as close to the original as possible.
Does this site take up storage on my device?
A little, and only so it can work offline: the app itself (about 1 MB) plus, if you've used a conversion that needs the compatibility engine, its one-time 32 MB download. That's roughly 35 MB total at most. Your actual videos are never kept: they're processed in memory and released when you leave. The cache is ordinary browser storage, so your browser reclaims it automatically if your device runs low on space, and you can remove it any time with your browser's 'clear site data' option.