Convert Video is shaped around how people actually use video editing and conversion utilities online: open the page, drop in a file, get the result. Convert videos between MP4, WebM, MOV, MKV, and animated GIF — entirely in your browser. Your file never leaves your device. The interface stays out of the way once the work begins so the engine can use the available CPU and memory for the actual transformation.
If you fit any of these descriptions, Convert Video should slot cleanly into your workflow: creators trimming short clips; support agents preparing screen recordings; teams compressing demo recordings. The tool keeps the controls focused on what matters for each of these use cases.
Convert Video parses your file with FFmpeg compiled to WebAssembly entirely inside the browser, applies the options you selected, and returns a download. The processing has no network step, which means a slow or intermittent connection does not slow down the work — once the page is loaded, only your CPU and RAM are involved.
Technically, the work is done by FFmpeg compiled to WebAssembly, loaded as part of the page. Inputs in MP4, WebM, MOV, MKV, OGV, AVI, and FLV format are recognised automatically and validated before the engine begins processing. Files up to 500 MB are supported per run; that ceiling keeps browser memory usage stable on a wide range of devices.
Most people land on Convert Video via a search at the moment they actually need the tool. That shapes the design: the page is a single screen with the input on one side, the controls in the middle, and the result on the other, so a first-time visitor can complete the job without reading documentation.
Workflow tip: Convert Video pairs well with Compress Video. Because every tool is a separate page, you can mix and match the steps that match your job. Bookmark the ones you reach for the most.
The download is delivered as `{name}-converted.{ext}` the moment processing completes — no email link, no "your result will be ready in 5 minutes" queue, no expiry timer. The file is generated in your browser and saved by your browser's normal download flow.
The hard constraints are easy to remember. Maximum input: 500 MB. Multiple files per run: no — one input at a time, by design, to keep results predictable. The same controls apply on every run.
Convert Video keeps the control set focused. Every option on the page is there because a real workflow needs it, and the defaults aim at the most common case so a first-time user can get the right output without changing any settings.
Some context on why Convert Video exists in this form: modern File APIs, high-performance JavaScript engines, and well-maintained open-source libraries now make it possible to perform video editing and conversion work entirely in the browser. Convert Video is built on top of that capability, which is why a single page can host the full pipeline.
If you want to get the most out of Convert Video, three small habits help. Drag-and-drop is faster than the file picker once you get used to it. The keyboard shortcut for downloading the result is whatever your browser uses for "save link as," because the result is a normal download. And if you are working on a sensitive file, processing in an Incognito or Private window is a good extra layer — it leaves no trace in browser history when the tab closes.
If the result is not what you expected, the most common causes are easy to check. Confirm the input is under the 500 MB ceiling — files just above the cap fail silently because the engine refuses to allocate the buffer. Confirm the input is one of the supported formats. And if the page itself feels slow, try closing other heavy tabs to free up memory; the engine runs in your browser, so it competes for the same resources as everything else open.
Convert Video produces deterministic output: the same input plus the same options always produces the same result. That predictability matters when the result has to match an upstream specification or be reproducible later.
Open the workspace above to start using Convert Video. The engine loads on the first interaction so the page itself stays light, and once the tool is warm it processes subsequent jobs quickly. The moment the page is interactive, the tool is ready to do real work on your file.
Your video is converted using FFmpeg compiled to WebAssembly (WASM), running entirely inside your browser. The file is read into memory, transcoded to your chosen format, and then offered as a download. Nothing is uploaded to a server.
You can convert from common formats like MP4, WebM, MOV, MKV, AVI, FLV, and more, into MP4 (H.264 + AAC), WebM (VP8 + Vorbis), MOV, MKV, or animated GIF.
GIFs are an old format with poor compression. Limiting size and frame rate keeps the output file small enough to share — full-resolution GIFs of even a short video can easily exceed 50MB.
Yes — audio is kept and re-encoded to match the target format (AAC for MP4/MOV/MKV, Vorbis for WebM). The exception is GIF, which has no audio support by design.
You can convert videos up to 500MB. Larger files may run out of browser memory since everything is processed locally without using a server.
No. Your video stays on your device the entire time. FFmpeg runs as WebAssembly inside your browser, so all processing is 100% local and private.
Cloud converters use powerful servers, but they require uploading your file. This tool trades a bit of speed for full privacy — your video never leaves your computer.
Convert Video is a static page running an open-source engine in your browser, so a typical corporate firewall does not get in the way as long as it allows JavaScript and WebAssembly to load from Favtoo. For teams that need to host it themselves on an internal network, the underlying engine (FFmpeg compiled to WebAssembly) is open-source and can be packaged into a private build with the same behaviour. Reach out via the Contact page if that is something you are exploring.
Once the page is loaded, Convert Video can complete jobs without an active internet connection — the engine is bundled with the page, so there is no per-job network call. The initial page load does require a connection (to fetch the static assets), but after that you can disconnect entirely and the tool will still work. This is a side-effect of the local-first architecture, not a deliberate "offline mode" feature.
Convert Video is free to use. The processing runs in your browser, which keeps the per-user cost low enough that the tool can be offered openly. The download is the same file the engine produced — you can use it for as many runs as you need.
Inputs are capped at 500 MB per file, which keeps memory usage stable across phones, tablets and older laptops. You can run Convert Video as often as you need; every run produces a full-quality result.
Convert Video runs in any modern mobile browser — Safari, Chrome, Firefox and the in-app browsers in most messaging apps all support the underlying APIs. Performance depends on the device: a recent phone handles typical inputs nearly as fast as a laptop, while older devices may take a few seconds longer near the 500 MB ceiling. The interface lays out cleanly on small screens, so you do not need to pinch-zoom to see the controls.
Convert Video is built to preserve quality wherever the underlying video format allows it. Operations that are mathematically lossless (e.g. structural transformations, lossless re-encoding) round-trip with no perceptible change. Operations that involve a lossy codec inevitably introduce small artefacts at the byte level, but the defaults aim at the sweet spot where output looks or sounds the same to a normal viewer or listener while still being meaningfully smaller or faster than the input.
Most jobs finish in seconds. Speed scales with input size and with how many CPU cycles your browser tab has available — the engine runs in your browser, so it shares resources with whatever else you have open. For inputs near the 500 MB ceiling, expect anywhere from a few seconds to roughly a minute on a typical laptop. Closing other heavy tabs noticeably speeds things up.
Convert Video is a browser-only tool by design and does not expose a hosted API. The reason is the same as the privacy story: there is no Favtoo backend doing the work, so there is no service to call. If you need to script the same transformation, the underlying engine (FFmpeg compiled to WebAssembly) is open-source and can be used directly from your own code.
Convert Video accepts MP4, WebM, MOV, MKV, OGV, AVI, and FLV. If your input is in a format that is not directly supported, convert it first using one of Favtoo's converter tools — every Favtoo converter outputs a file that is a clean input to the next tool in the chain.
Video to GIF
Convert any video clip to an animated GIF entirely in your browser. Pick the start, length, frame rate, and width — your file is processed locally with FFmpeg WebAssembly and never uploaded.
Screen Recorder
Record your screen, a window, or a browser tab directly in your browser. Optionally include system audio and your microphone. Capture, preview, and download the video without installing any app — and without uploading anything.
Webcam Recorder
Record your webcam directly in your browser with optional microphone audio. Pick the resolution (480p, 720p, or 1080p), frame rate, and mirror mode, then capture and download the result without installing any app.
Screen + Webcam Recorder
Record your screen with your webcam composited into a picture-in-picture corner — perfect for tutorials, course videos, demos, and reaction recordings. Pick the camera position, size, and audio sources, then capture and download in your browser.
Video Slideshow Maker
Turn a stack of photos into an MP4 slideshow with per-slide durations, crossfades, and an optional soundtrack. Pick the resolution (up to 1080p), frame rate, and transitions, then download a single MP4 — all processed in your browser with FFmpeg WebAssembly.
Video from Images + Audio
Combine a stack of photos with a music track or narration into a single MP4 video. Pick the resolution, per-slide duration, transitions, and let the slideshow length match the audio. All processed in your browser with FFmpeg WebAssembly.
Video Trimmer
Set precise in and out timestamps, snap to keyframes when needed, and document handles for social-safe cutdowns.
Video Splitter
Split any video into 2–10 equal-length pieces, packaged as a downloadable ZIP. Files are processed entirely in your browser with FFmpeg WebAssembly using lossless stream-copy.