Media Convertifly: FFmpeg media converter that turns plain English into real commands and runs them locally in your browser — and translates FFmpeg commands back into plain English
No account · no limits · no uploads
The free converter that never sees your files.
Yes, you can quickly convert media by just saying what you want — and get what you need.
Drop in a clip, a track, or an image and say the change you want in plain words. It runs real FFmpeg on your own machine and hands back two things: the finished file, and the exact command that made it — yours to copy, reuse, or learn from. Nothing to install, nothing uploaded, no account.
convertifly · livestarting…
Drop a file to convert
or click to browse · video, audio, image
$ command to run
Tap any part of the command to see what it does.
Runs exactly what you type. Keep input.ext and output.ext so your file flows through — switch output.mp4 to output.webm to change format.
Try “scale to 720p”, “extract audio as mp3”, or “turn it into a gif” — the exact command appears before anything runs.
MP4WEBMMOVMKVGIFWEBPPNGJPGMP3WAVFLAC+ 190 more
Why local beats online converters
Other converters upload your files to someone else's server. This one doesn't.
Your files stay put. FFmpeg runs inside your browser tab, so the file never gets uploaded — there's no server to send it to in the first place.
No caps, no upsell. No weekly conversion limit, no file-size ceiling, no Pro plan to unlock. Convert as much as you want, free.
Nothing to depend on. No account to create, no server that can rate-limit you or quietly shut down. It's one page that keeps working.
Everything FFmpeg can do — nothing you have to memorize.
It all runs on your own machine. No upload step, no place in line, no spinner on a stranger's server.
Plain words, real commands
Skip the flags and codec names. Describe the result you're after and the tool works out the right FFmpeg command for you.
Stays on your device
FFmpeg runs through WebAssembly right inside the tab — quick, private, and still working even with the connection cut after the page loads.
Nothing's hidden
Each request shows the precise FFmpeg line before it executes. Total transparency — and a low-stakes way to actually learn the tool.
What can you ask for?
Tap any prompt to drop it straight into the converter.
Three steps, under a minute.
STEP 01
Drop a file in
Add your video, audio, or image, then say what you want in plain words — “make it 720p and mute it.” There's no syntax to memorize and nothing to look up.
STEP 02
Check the command
Your request becomes a real FFmpeg command, spelled out in full before a single frame is touched. Read it, learn from it, or copy it for your own scripts.
STEP 03
Run it locally
Press the button and everything happens on your own machine. The finished file lands right back in your hands — no upload, no queue, no waiting on a server.
Got a file that needs fixing?
Free to use, private by default, and quick. No sign-up, and nothing ever leaves your machine.
Media Convertifly
A free, fully client-side media converter. Drop in a video, audio file or image, say the change you want in plain words, and a built-in translator — no AI, no server — writes the real FFmpeg command and runs it locally with WebAssembly. Your file and your words both stay on your device, and the exact command is always in view so you can learn from it or reuse it.
Never. The whole conversion runs on FFmpeg compiled to WebAssembly, executing inside this one browser tab. Your file is read straight off your disk into memory and the result is written back the same way — nothing is sent to any server, mine or anyone else's. Load the page once and you can pull the plug on your connection; it keeps working.
Is there anything to install or an account to make?
Nope. It's a single web page — open it, drop a file, and start typing. No download, no sign-up, no browser extension, and you don't need to know the first thing about FFmpeg to use it.
Do I get to see the command before it runs?
Yes, every time. As you type, the exact FFmpeg command builds live underneath your request, and nothing executes until you choose to run it. It's a painless way to pick up FFmpeg by example — copy the line into your own terminal whenever you want.
Does it use AI to figure out the command?
No. The translation runs on a small, deterministic set of rules built right into the page — not a language model, and not a server. Your words are never sent off to an API, the same request always produces the same command, and the whole thing keeps working with your connection switched off. That's different from the AI-powered “FFmpeg in plain English” tools that hand your prompt to a model in the cloud.
Which formats does it understand?
Just about anything FFmpeg does — hundreds of containers and codecs. On the video side: MP4, WebM, MOV, MKV, AVI. For audio: MP3, WAV, FLAC, AAC, M4A, OGG, Opus. For stills and loops: PNG, JPG, WebP, and animated GIF. If all you need is an animated GIF built from scratch, Vibe GIF is made for that.
What's the largest file it can take?
Since it works in memory, it's happiest with clips, tracks, and images in the range of a few hundred megabytes. A very long video can bump into however much RAM your device has free. When the only goal is making a video smaller, Video Shrinker is a focused, browser-based compressor.
How is this different from CloudConvert or Zamzar?
CloudConvert and Zamzar upload your file to their servers, convert it remotely, and hand it back — often behind daily limits or paid tiers. This runs FFmpeg locally on your own machine, so nothing is uploaded, there are no caps, no watermarks, and you see the exact command instead of a black box.
What kinds of edits can I ask for?
Convert formats, resize or scale, crop to an aspect ratio or square, trim a clip, change the frame rate, speed up or slow down, rotate or flip, pull out or mute audio, normalize or change the volume, slim a file down for the web, grab a thumbnail frame, or make a GIF — and you can stack several of these into one request.
Can I make several versions of one file at once?
Yes — that's what outcome packs are for. Drop one file and pick a pack: a Social pack makes a square 1:1, a vertical 9:16 and a thumbnail; a Web pack makes an MP4, a WebM and a poster; a Sticker / icon set resizes an image to 512, 256 and 128px. Each piece is built locally and the whole set downloads as a single .zip (or grab them individually).
Can I paste an FFmpeg command and have it explained?
Yes — it works in both directions. Paste a real FFmpeg command and it translates the flags and filters back into plain English, so you can see what something you found online actually does — then run it as-is or tweak the readable version. The other way round, every plain-English request shows the exact command it builds, with a Copy button to drop it straight into your own terminal.
Can I combine multiple files — merge clips, add music, make a slideshow?
Yes. Drop two or more files and a Combine bar appears with the options that fit them: merge several clips into one video, build a slideshow from images, add or replace a video's audio with a music or voice track, or overlay a logo onto a video or photo. Reorder clips, set the slideshow timing or logo corner, and it runs locally with one result to download.