InfyTool
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Video converter

MOV, MKV, AVI and friends into MP4 or WebM that play everywhere — converted on your own device, with the speed trade-off stated honestly.

One video · processed on your device, nothing is uploaded

No size limit · files are processed on your device and never uploaded · how it works

Honest speed note: video re-encodes at roughly the clip's own length (a 2-minute video takes ~2 minutes). Nothing is uploaded — the work happens on your device.

Advanced settings (optional)
Output options
Format

H.264 MP4 — plays everywhere.

Quality

Hard to tell from the original at normal viewing.

Resolution

Capping the height is the biggest size saver — 720p is plenty for sharing.

Audio

Dropping audio saves space on screen recordings that have none worth keeping.

Runs in your browser. Files are never uploaded — you can go offline after the page loads.

How to use the Video Converter

  1. Drop one video — MOV, MKV, AVI, WebM, 3GP and more.
  2. Pick MP4 or WebM, a quality preset and an optional resolution cap; it converts at about the clip’s own length.
  3. Preview the result in the page and download it.

Easy to use

Drop files, pick options, download. Whole folders at once, no signup, no daily limit.

Best quality

The same engines the professionals use — SVGO, resvg, MozJPEG, libwebp, libavif — compiled to run in your browser.

Private & secure

Files are processed on your device and never uploaded. Close the tab and nothing remains anywhere.

The honest trade

Everything here runs on FFmpeg compiled to WebAssembly in your browser. The gain: your video never leaves your device — no upload queue, no size cap, no server ever seeing a personal recording. The cost, stated plainly: one CPU core re-encodes at roughly the clip's own length. For the clips people actually convert — a MOV that won't play on Windows, a MKV a TV refuses, a WhatsApp-bound AVI — that is minutes, not hours.

Details that decide whether it plays

The MP4s written here use H.264 with yuv420p pixels, even dimensions and faststart — the four unglamorous details that separate "plays everywhere" from "black screen in iMessage". If you only need the file smaller rather than a different format, Compress Video presets the same engine for size; if you only need part of the clip, trim it losslessly first.

Frequently asked questions

How long does converting take?

Honestly: about the clip’s own length — a 3-minute video re-encodes in roughly 3 minutes, because the encoder runs on one CPU core in your browser. For short clips that is perfectly fine; for a feature-length file, desktop software will be faster. What you get in exchange: the file never leaves your device.

Why will some files not convert?

The browser build of FFmpeg reads the common codecs (H.264, HEVC in many cases, VP8/VP9, MPEG-4, MJPEG) but not every proprietary camera format. If a file fails, it says so immediately rather than pretending.

MP4 or WebM?

MP4 unless you know you want WebM: it plays on iPhones, TVs, PowerPoint and messengers. WebM (VP9) is 20–40% smaller at the same quality and ideal for websites you control.

Does converting reduce quality?

Re-encoding always costs a little; the Balanced preset (CRF 26) is hard to tell from the original at normal viewing. Sharp keeps more, Economy trades visible fineness for much smaller files. Trimming first with Trim Video (lossless) avoids re-encoding parts you will throw away.

Quick presets

Compress VideoA video small enough to send Trim VideoWatch the video, mark start and end where you pause it, cut Video to GIFA clip in, a loop-ready GIF out

Your files never leave your device

Most online converters upload your file to a server. InfyTool ships the actual encoders to your browser as WebAssembly instead, so processing happens inside your tab — faster for batches, and nothing to delete afterwards.

  • No upload, ever. Turn off Wi-Fi after the page loads and every tool keeps working.
  • No limits. No file-size cap, no queue, no watermark, no account.
  • Runs on your CPU. Batches use several cores in parallel; nothing is throttled.

More free tools

Need graphics to work with?

InfyTool is built by the same team as these free libraries.

InfyPNGFree transparent PNG graphics for mockups and social posts. InfySVGFree SVG designs and illustrations, ready to optimise or convert. InfyIconFree SVG and PNG icons you can open directly in these tools.