RashTools

    Video Converter

    MP4, AVI, MOV conversions

    or drop a video here

    Max 2 GB per file · Under 500 MB recommended for best speed

    ⚡ All conversion happens in your browser using FFmpeg.wasm — your videos never leave your device. Supports MP4, WEBM, AVI, MKV, MOV, 3GP, FLV, OGV, WMV.

    Convert video between MP4, MOV, WebM and more

    Change container and codec in the browser, with resolution and quality settings you can adjust before exporting.

    Make a file your player will actually open

    MKV on a TV, MOV on Windows, AVI on a phone — converting to MP4 solves most 'unsupported format' messages in one step.

    Try this tool
    Make a file your player will actually open

    Match what the upload page expects

    Platforms differ on codec, frame rate and resolution. Convert to a safe combination and the upload stops failing halfway through.

    Open Compress Video
    Match what the upload page expects

    WebM for the web, MP4 for everything else

    WebM keeps site pages light; MP4 plays on almost any device. Export whichever the destination prefers without installing software.

    Open Video Trimmer
    WebM for the web, MP4 for everything else

    Step-by-step guide

    How to use Video Converter?

    Convert videos to MP4, WebM, AVI, MOV, MKV, 3GP and more without installing any software.

    Step-by-step instructions

    1. 1

      Upload the video file you want to convert.

    2. 2

      Pick the target format (MP4, WebM, AVI, MOV, MKV, 3GP, FLV, OGV, WMV).

    3. 3

      Optionally tweak quality or resolution.

    4. 4

      Click Convert.

    5. 5

      Download the new video.

    Benefits

    • 9 output formats including 3GP for old phones.
    • H.264 ultrafast preset for quick MP4 export.
    • Handles large videos with no upload wait.
    • Files stay on your device — nothing uploaded.

    Who is it for?

    • Users converting phone videos for older devices
    • Web developers preparing WebM for the browser
    • Video editors moving between formats

    FAQ

    Frequently asked questions

    Open Convert Video Online Free — Fast & Easy File Conversion in your browser, click the Choose File button or drag-and-drop your video into the large drop area, then pick an output from the Output Format dropdown (MP4, MOV, AVI or MP3). If you want compression, enable the Compression toggle and choose a resolution (1080p, 720p, 480p) and bitrate slider (e.g., 2,500 kbps for 720p). Click Convert and watch the progress bar; when finished hit Download to save the .mp4, .mov, .avi or .mp3 file. No signup and no server upload are required — the work is performed in your browser, and there is no watermark on downloads.

    Convert Video Online Free accepts common inputs such as .mp4, .mov, .mkv, .webm, .flv, .wmv, .avi and .mpeg for upload in Chrome, Firefox and Edge on desktop. Output choices are limited to MP4 (.mp4), MOV (.mov), AVI (.avi) and audio-only MP3 (.mp3). For audio extraction you can convert a .mp4/.mov/.mkv to .mp3; if your source uses exotic codecs (e.g., ProRes or some HEVC variants) the browser decoder may fail — in that case export with a desktop tool like HandBrake before using the web converter.

    Because Convert Video Online Free processes files in your browser (no server upload), realistic limits depend on device memory: on a desktop with 8+ GB RAM Chrome/Edge handle files up to ~1–2 GB reliably, Firefox similar; on low-memory machines or older Macs you should keep files under ~500 MB. On iOS Safari and many Android browsers you should target ≤200 MB to avoid crashes or the file picker hanging. If you need to work with larger files, split them locally or use a desktop encoder like HandBrake which streams from disk and can handle multi-gigabyte files.

    In the tool choose Output Format → MP4, enable Compression, then set Resolution to 720p (or keep 1080p if you need higher detail) and set a target bitrate around 2,500–5,000 kbps for 720p/1080p respectively — for example 2,500 kbps yields much smaller files with acceptable quality for web viewing. Use the H.264 baseline (default) option where available for compatibility; two-pass encoding isn’t available in-browser, so file sizes are approximate and smaller bitrates will show visible artifacts. Always preview the result after conversion and, if needed, re-run with slightly higher bitrate or resolution to preserve detail.

    Yes — pick your video file, select Output Format → MP3, then (optionally) choose an MP3 bitrate: 128 kbps for voice/podcasts, 192 kbps for mixed content, or 320 kbps for near-CD quality. The tool extracts the audio track and produces a .mp3 file you can download directly; it preserves the original sample rate when possible but you can force 44.1 kHz if needed. Because conversion is client-side there’s no account or upload; for lossless audio extraction use a desktop tool to create .wav or .flac since this web tool only outputs .mp3 audio.

    Common causes are browser memory exhaustion, unsupported input codec (for example Apple ProRes or some HEVC/H.265 variants), or selecting a very high target bitrate/resolution that the browser cannot handle. Fixes: try a smaller source file, switch to Chrome or Edge on desktop (they handle WebAssembly FFmpeg better), lower the resolution/bitrate in the Compression settings, or transcode the source to a more standard codec (H.264 in an .mp4 container) using HandBrake before using the web tool. If the page freezes, refresh the site and retry with a smaller file; your original file remains on your device.

    Convert Video Online Free focuses on single-file in-browser conversions: the UI processes one file at a time, so there’s no formal batch queue button — you can convert multiple files but must start each conversion separately and download each result. You can keep the page open and repeat Choose File → Output → Convert for subsequent files, but doing many large files back-to-back will consume browser resources and can cause slowdowns. For true batch jobs or folders of videos, use a desktop app like HandBrake or FFmpeg which supports automated batch processing and two-pass encoding.

    Chrome and Edge generally offer the best performance because their WebAssembly engines and memory handling allow larger in-browser conversions (up to ~1–2 GB). Firefox is comparable but can be slightly slower on large files; Safari on macOS and especially Safari on iOS has stricter memory limits and poorer WebM/codec support, so HEVC/HEIC files or very large jobs may fail. If Safari fails, switch to Chrome/Edge on the same machine or use a desktop encoder; also clear other tabs and free RAM before converting large files to reduce crashes.

    The service operates entirely in your browser using a WebAssembly build of FFmpeg, so the file is not uploaded to an external server during conversion — everything happens locally and the resulting file is downloaded back to your device. There’s no signup and the site does not store your files, which reduces risk of data leakage; however, browser extensions or malware on your machine could still access temporary data, so run conversions on trusted devices. If you need an auditable offline workflow, use a local desktop encoder such as HandBrake for full control over file handling.

    On iOS and Android pick smaller source files (under 200 MB recommended), close other apps and tabs to free RAM, and use Chrome on Android or Safari on iOS where the file picker integrates correctly; choose 720p/480p or lower bitrate to speed up conversion. Avoid uploading HEVC/HEIC-heavy files from iPhones—first save a duplicate in H.264 if possible via Photos export or use a desktop to re-encode. If the mobile browser crashes, transfer the file to a desktop and run the conversion there for better speed and stability.

    The in-browser converter is designed for single-track output and will keep the primary audio track by default but does not reliably preserve multiple audio streams or embedded subtitle tracks during conversion to MP4/MOV/AVI. If you require multiple audio tracks or soft subtitles (.srt/.ass) included, use a desktop tool like MKVToolNix or HandBrake which allow stream selection and subtitle burning. For simple subtitle burning, first extract or burn subtitles into the source with a desktop app, then use the web converter to change container/codec if needed.

    Convert Video Online Free is convenient for quick, single-file jobs with basic controls (resolution, bitrate, MP4/MOV/AVI/MP3 output) and no signup, but it lacks advanced features like two-pass encoding, custom filters, hardware-assisted encoding settings, or robust batch processing that HandBrake and FFmpeg provide. HandBrake/VLC can handle multi-gigabyte files more reliably, support advanced codec options (H.265 two-pass, presets, filters) and preserve multi-track subtitles/audio; choose the web tool for fast, privacy-friendly single conversions and a desktop app for high-quality, repeatable or large-batch workflows.

    About this tool

    Convert videos to MP4, WebM, AVI, MOV, 3GP and more

    Older phones often struggle with modern MP4 files, classic editing software might insist on AVI, and putting a clip on the web usually means WebM for the smallest possible payload. Our video converter sits at the intersection of all those needs — pick any source video and re-encode it to MP4, WebM, AVI, MKV, MOV, 3GP, FLV, OGV or WMV in a single click.

    We use H.264 with the ultrafast preset for MP4-family containers so even long clips finish quickly, VP8/Opus for WebM, and a special low-bitrate 3GP profile (352×288, mono audio) sized for legacy mobile devices. Conversions run on FFmpeg.wasm inside your browser, which means no upload limits, no privacy concerns, and no bandwidth cost.

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