NOTE: The Slash character is not allowed to execute your FFmpeg command
Note: Fill in the two parameter inputs above to build a ready-to-run command for the FFmpeg or FFprobe binary on our processing service; the output filename you type here is the name the server-side run will write to and what the download link below will fetch. Final command is:
The executing process has completed. Command out below:
Convert Files Easily with FFmpeg Online Converter
FFmpeg Online uploads your media file and command to a hosted processing service that runs the same FFmpeg or FFprobe binary as the command line, then returns the result as a download. No local install and no account are required.
The console log streams to the page in real time so you can follow encoding progress rather than watch a spinner, and because the work runs on the service host your device is not CPU-bound.
Command patterns that cover most jobs
Copy any of these as a starting point and adjust the codec or bitrate for your file.
Format conversion (MP4 → WebM). -i input.mp4 -c:v libvpx-vp9 -b:v 1M -c:a libopus output.webm - re-encodes to VP9 video and Opus audio for modern browsers.
Trim a segment (keep seconds 10-30). -i input.mp4 -ss 10 -t 20 -c copy output.mp4 - -c copy avoids a re-encode, so the trim is instant.
Extract audio only (MP4 → MP3). -i input.mp4 -vn -c:a libmp3lame -b:a 192k output.mp3.
Resize to 720p. -i input.mp4 -vf scale=1280:720 -c:v libx264 -crf 23 output.mp4 - bicubic scale + quality-targeted H.264 re-encode.
Probe a file before editing. Switch the binary to ffprobe and pass -v quiet -print_format json -show_format -show_streams input.mp4 to get codec, bitrate, duration, and stream metadata as JSON.
Animated GIF to a playable video (GIF → MP4). -i input.gif -movflags faststart -pix_fmt yuv420p -c:v libx264 -crf 23 output.mp4 - -pix_fmt yuv420p converts the GIF's indexed-color palette to a format every player decodes, and -movflags faststart lets the MP4 start playback before the whole file downloads. Useful when a GIF needs to become a scrubbable, seekable video instead of a looping image.
Remember: the forward-slash is reserved by this tool's command parser, so express paths without leading slashes and avoid the / separator in filter chains.
FFmpeg vs FFprobe - pick the right binary first
The first dropdown switches between ffmpeg and ffprobe. FFmpeg is the encoder: use it to re-encode (MP4 to WebM), trim, resize, or extract audio - it produces a downloadable output file. FFprobe is the read-only inspector: it reports the file's metadata and produces no download - useful when debugging why a file does not play. Both take their flags in the same parameters box.
Privacy and retention
Files are uploaded over HTTPS to service.us-east-1a.freetool.online and removed shortly after the command finishes (the retention window is reported as web.minsToDelFile at page load). For on-device compliance requirements, run FFmpeg locally.
Hosted service, in-browser converter, or local FFmpeg - quick decision
Arbitrary or chained flags belong on this page. Where the file fits comfortably in browser memory and you only need a lighter conversion, the in-browser HD Video Converter runs FFmpeg.wasm with nothing leaving your device - a single small MP4-to-WebM swap is faster there. A multi-hour batch, a hardware-accelerated encode, or a file larger than the upload window is still a job for FFmpeg installed locally. If you want a common format change without touching a command line at all, All Video Converter covers MP4, WebM, MOV, and MP3 with a GUI; Video Maker assembles still images into an MP4 slideshow in one click; and GIF Maker turns short clips into shareable GIFs.
Hosted ffmpeg vs local ffmpeg - which one now? The guide ffmpeg online vs local ffmpeg when each wins works through the edge cases behind that decision file type by file type.
Conversion stalled or stuck? Read FFmpeg online conversion stalled: three fixes for the three most common causes - upload size limit, reserved forward-slash in the command, and a binary switch that needs changing - with the exact adjustment for each.
MP4 to GIF without an install
A practical command for turning the first five seconds of a short MP4 clip into a shareable GIF loop: -i input.mp4 -ss 0 -t 5 -vf "fps=12,scale=480:-1:flags=lanczos" output.gif - -ss and -t pick start and length, fps=12 keeps the file small without looking jerky, and scale=480:-1 resizes the width while preserving aspect ratio. If a click-only flow is enough, GIF Maker handles the same conversion with a GUI; use this page when the source needs a specific trim or frame-rate that the GUI does not expose.
Free Tool Online Editorial Team
Frequently Asked Questions
How do I run a conversion on this page?
Four steps, from any device with a browser:
- Drag the media file into the tool, or select it from your files.
- Pick the binary and the output format you want.
- Adjust the parameters the job needs - resolution, bitrate, frame rate, codec.
- Start the command, follow the console log, then download the processed file.
Which file types are supported?
The service runs the same FFmpeg and FFprobe binaries as the command line, so the format coverage is theirs: MP4, AVI, MOV, MP3, WAV, JPEG, and PNG are the common ones, alongside many more video, audio, and image containers and codecs.
Why use FFmpeg online instead of installing it?
FFmpeg is a widely used open-source multimedia tool, but getting it onto a machine and learning its flag syntax is the part that stops most people. This page keeps the same binaries and passes your flags straight through, so a one-off job needs no local install, no package manager, and no container - and it is free to use, with no signup.
Is my data secure?
Your file travels over HTTPS and is used only to run the FFmpeg or FFprobe command you submitted. The session is anonymous and the upload is identified internally by a session id only, with no account attached to it. How long the file and its output stay on the host is covered under Privacy and retention above.