video converters

Convert video to WebM or animated GIF in your browser

Optimal Convert re-encodes MP4, MOV, MKV and AVI to WebM (VP8/VP9 + Opus) through the browser’s native MediaRecorder, with resolution, frame rate and bitrate controls. You can also pull an animated GIF straight from a video clip — sampled and capped so the file stays reasonable. Files stay in your tab the whole time: nothing is uploaded, and there are no size or time limits.

Video converters

Every video converters Optimal Convert supports, with its own page and a preconfigured converter.

MP4 to WebM converter — browser-only file conversion illustration
MP4 to WebM
.webm
Convert MP4 to WebM in your browser — free, unlimited, no uploads.
Convert free →
MOV to WebM converter — browser-only file conversion illustration
MOV to WebM
.webm
Convert MOV to WebM in your browser — free, unlimited, no uploads.
Convert free →
MKV to WebM converter — browser-only file conversion illustration
MKV to WebM
.webm
Convert MKV to WebM in your browser — free, unlimited, no uploads.
Convert free →
AVI to WebM converter — browser-only file conversion illustration
AVI to WebM
.webm
Convert AVI to WebM in your browser — free, unlimited, no uploads.
Convert free →
MP4 to GIF converter — browser-only file conversion illustration
MP4 to GIF
.gif
Convert MP4 to GIF in your browser — free, unlimited, no uploads.
Convert free →
MOV to GIF converter — browser-only file conversion illustration
MOV to GIF
.gif
Convert MOV to GIF in your browser — free, unlimited, no uploads.
Convert free →

More converters

Images converter — browser-only file conversion illustration
Images converter
Convert images to JPG, PNG or WebP — and HEIC, SVG, GIF, AVIF, BMP, TIFF & more — entirely in your browser. Free, unlimited, no uploads.
Convert free →
PDF converter — browser-only file conversion illustration
PDF converter
Turn PDF pages into JPG, PNG or WebP, merge PDFs together, or render DOCX reports to PDF — right in your browser. Free, private, no uploads.
Convert free →
Audio converter — browser-only file conversion illustration
Audio converter
Convert WAV, FLAC, OGG, M4A, AAC and MP4 audio to MP3 or WAV in your browser — with sample-rate and mono controls. Free, unlimited, no upload.
Convert free →

Popular guides

Plain-English explainers of the formats in this hub — what each one is for and when to convert.

WebM vs MP4 — video container? — format guide illustration

WebM vs MP4 — video container?

WebM is lighter and royalty-free; MP4 is the compatibility king. See the trade-offs and convert MP4 to WebM free, in your browser, no uploads.

Read the guide →

Private by design

This page runs entirely in your browser. Files are read, converted and saved on your own device using WebAssembly and the browser’s native codecs — nothing is uploaded, there is no account, and your bytes never leave your machine. Not even we can see them.

Read the privacy policy →