FLV to MP4: 3 Simple Steps to a Compatible Video
The Klipa editorial team · tested on September 29, 2026 An old FLV recording may still contain the video you need, but phones, TVs and current editing apps often do…
Lossless Copy or Smart Re-Encode, Depending on Your Codec
Converting a video online means changing its file format — for example a MOV into an MP4, or an AVI into an MKV — without installing anything: you drop the file, Klipa automatically detects whether it can copy it losslessly or needs to re-encode it, and you get the result back within minutes.
The format a video file arrives in is rarely a choice: an iPhone records in MOV, an old camcorder or screen recorder produces AVI or WebM, an export from professional editing software lands in MKV. Klipa's converter absorbs those differences in one step: five output formats (MP4, WebM, MOV, AVI, MKV), and on input, legacy formats too — WMV, FLV and 3GP.
Proof in the result
What the tool produces
How to Convert a Video Online
Step 1
Upload Your Video
Drag in a file in a common format — MP4, MOV, AVI, MKV, WebM — or even an older FLV, WMV or 3GP file.
Step 2
Pick the Output Format
MP4 for universal compatibility, WebM for the web, MOV for Apple editing workflows, AVI or MKV depending on your needs. Klipa detects your file's codec and decides on its own between a lossless copy and a re-encode.
Step 3
Download the Result
A lossless copy (codec already compatible) is near-instant; a re-encode (HEVC, ProRes, codec change) takes a bit longer, depending on file size. Grab the file, watermark-free, or chain it straight into another Klipa tool — compression, subtitles — without re-downloading anything.
Why Convert With Klipa
Five common formats
MP4, WebM, MOV, AVI and MKV on output — the formats that cover nearly every sharing and editing need.
Lossless when possible
When the source codec already fits the target container, Klipa copies the stream as-is: no recompression, no quality loss.
Watermark-free
Unlike some other video tools, the converter adds no logo to the result, whatever your plan.
No software to install
Everything happens in the browser: no software download, no codec settings to figure out beforehand.
Real cases
Use Cases
iPhone or Mac Video to MP4
An iPhone records in MOV, sometimes in HEVC. Convert it to MP4 so it opens without issue on a Windows PC, an Android phone, or any social platform.
Legacy Files to a Modern Format
Camcorder footage in AVI, screen recordings in WebM, archives in WMV or 3GP: convert them to MP4 to play them on a current device and back them up for the long term.
Browser Screen Recordings
Chrome and Firefox save screen recordings as WebM. Convert to MP4 to share a tutorial, bug report, or demo with anyone, regardless of their device.
To MOV for Apple Editing
Final Cut Pro and iMovie work best with MOV. Convert your MP4 source footage to MOV before importing for a smoother editing timeline.
To WebM for a Website
A page background video needs to be light. WebM produces a smaller file than MP4 at comparable quality, which means a faster page load.
Related Tools
PrepareFetch the video and get the right format
EditCut, clean the sound and the silences
TransformTurn it into short clips, ready to publish
EnrichSubtitles, translation and transcription
Frequently Asked Questions
What video formats can I convert with this tool?
Klipa converts videos to MP4, WebM, MOV, AVI or MKV. On the input side, it also accepts legacy formats like WMV, FLV and 3GP, automatically turning them into the output format you pick. For an animated GIF or audio-only file, use our dedicated tools instead.
Is the video converter really free, and do I need an account?
Your first try is free, with no signup.
Will converting my video reduce its quality?
It depends on the change you're making. If your video's codec already plays inside the new container, Klipa copies it as-is, with zero quality loss. If the codec itself must change (for example to WebM), a light re-encode happens — invisible to the eye at normal viewing quality.
What's the difference between a video's container and its codec?
The container (MP4, MOV, AVI...) is the file's wrapper; the codec (H.264, HEVC, VP9...) is how the picture is compressed inside it. Changing the container can happen without touching the picture at all; changing the codec always requires a re-encode.
Is there a file size limit for converting a large video?
Videos up to 2 GB are accepted. The Pro plan goes up to 2 hours, built for large camera or drone footage.
Does Klipa add a watermark to converted videos?
No, never. The converter adds no watermark to your video, whatever your plan — unlike some other Klipa tools that reserve a clean export for paid accounts, conversion produces a plain, ready-to-share file from the very first use.
Is my uploaded video kept private, and when is it deleted?
Your video is processed on our servers, then deleted automatically. Nobody else has access to it in the meantime, and you can re-download it until it expires.
Can I use this tool to convert a video to MP3 or GIF?
No, this converter only handles video-to-video conversion, never audio alone. To pull just the audio track as an MP3 file, use our dedicated audio extractor tool instead; for an animated GIF, our video-to-GIF tool is built specifically for that job.
Can I convert old formats like WMV, FLV or 3GP?
Yes. WMV files (from Windows Movie Maker), FLV files (old Flash-era sites) and 3GP files (2000s camera phones) are all accepted as input and converted automatically into a modern format like MP4, playable on today's devices and platforms.
The guides that extend the tool
Convert WMV to MP4 Online Free – Fast Guide
The Klipa editorial team · tested on September 29, 2026 A WMV that plays on an old Windows PC may refuse to open on your phone, Mac, or current editing app. You can…
3GP to MP4: Make Old Phone Videos Play Again
You’ve found an old phone video, but your laptop won’t open it—or a messaging app rejects it after you try to share it. Converting 3GP to MP4 can make the clip…
Ready to convert your video?
First try free, no signup required.
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A Format Should Never Block Your Video
A video file in the wrong format should never block a share, an edit, or an upload. Klipa's converter handles common formats — MP4, MOV, AVI, WebM, MKV — plus legacy ones, with a lossless conversion whenever possible and no watermark on the result. Need a specific pair? Check our dedicated MOV to MP4 or AVI to MP4 pages.
