WebM to OGV Converter

How to Convert WebM to OGV Online

1. Upload Your WebM File: Drag and drop or click "+ Add Files" to select one or more .webm clips. Batch is supported, so you can queue a whole folder of VP8/VP9 captures in one go.
2. Pick a Quality Preset (or Set a Target Size): The default "Very High (Recommended)" preset usually matches the source. Theora is less efficient than VP9, so for visual parity expect roughly 1.5-2x the bitrate of the WebM source. You can also choose Constant Bitrate, Variable Bitrate, Constant Quality, or Constraint Quality, or use the "Specific file size" field if you need to hit a hard cap.
3. Adjust Resolution and Trim (Optional): Under Video resolution, scale by percentage, pick a preset (144p through 4320p), or enter custom width/height. Under Trim, switch from "Unchanged" to "Time Range" to clip out a single scene before transcoding.
4. Convert and Download: Click Convert. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — no sign-up, no watermark, never shared.

Why Convert WebM to OGV?

WebM (VP8/VP9 video, Vorbis/Opus audio) and OGV (Theora video, Vorbis audio in an Ogg container) are both royalty-free formats from the same patent-free family, but they have very different roles. WebM is the modern default for HTML5 streaming and Wikimedia uploads; OGV is the legacy fallback that older Linux distros, archival workflows, and pre-2013 HTML5 players still expect.

• Legacy HTML5 fallback for very old players — Some embedded systems, kiosks, and pre-2013 Firefox/Chromium builds shipped without VP8/VP9 decoders but did include native Theora. An .ogv fallback in a <video> tag's <source> list keeps those clients playing.
• Wikimedia Commons re-encoding — Commons accepts WebM (preferred) and Ogg Theora; rendering an OGV alongside a WebM is useful when you need to match an existing file revision history. Commons caps single uploads at 5 GiB.
• Open-source CMS and LMS platforms — Older Moodle, MediaWiki, and Drupal video modules built around the Xiph stack often documented OGV as the canonical format. Migrations to those systems still call for .ogv files.
• Linux distribution sample media — Distros like Debian and Trisquel that ship only DFSG/FSF-libre codecs have historically used OGV for tutorial videos and welcome screens.
• Archival redundancy — Theora has been frozen and stable since 2009, with no patent disputes on the horizon, which is why some library and academic archives keep an OGV mezzanine alongside higher-efficiency formats.
• Audio-faithful re-container — Vorbis is the native audio codec for both WebM and OGV, so audio passes through cleanly with no recompression artifacts when source and target both use Vorbis.

WebM vs OGV — Format Comparison

Theora Quality Preset Guide

Theora is best tuned by quality level rather than fixed bitrate. Use this as a starting point — the actual bitrate the encoder picks scales with motion and resolution.

For reference, a VP9 WebM at the same visual quality typically lands around 40-50% of the equivalent Theora bitrate, which is the main reason file sizes grow during this conversion. If size matters more than format, consider compressing the WebM directly instead.

Frequently Asked Questions

Why is my OGV file larger than the original WebM?

Theora is an older codec — a direct descendant of VP3 from 2002 — and its compression is meaningfully behind VP9. To match the perceptual quality of a VP9 WebM, Theora typically needs roughly twice the bitrate, which translates to larger files. If you want OGV at the same size as the source, expect a visible quality drop; if you want the same quality, expect a larger file. There is no codec trick that avoids this trade-off.

Do modern browsers still play OGV?

Decreasingly. Chrome removed native Theora support in Chrome 123 (March 2024), citing low usage (well under 0.1% of media loads) and a string of zero-day attacks against legacy media decoders. Firefox followed with deprecation telemetry and has been phasing it out. Safari never shipped Theora. For sites that still need playback, the ogv.js JavaScript polyfill (maintained by Wikimedia) decodes Theora in the browser. VLC, MPV, mpv-based desktop players, and most Linux distro players still handle OGV natively.

Should I upload WebM or OGV to Wikimedia Commons?

Commons explicitly prefers WebM with VP9 video and Opus audio, but it accepts Ogg Theora and asks editors not to convert from Theora unnecessarily. If you're uploading a new file from a WebM source, keep it as WebM. The main reason to send OGV is to match a file's existing revision history or to satisfy a downstream system that specifically requires Ogg. See Commons:Video for the current upload limits (5 GiB per file).

What audio codec ends up in the OGV?

This converter writes Vorbis audio by default, which is the traditional pairing for Theora video inside Ogg and is supported by every player that handles OGV. If the source WebM used Opus audio, it will be transcoded to Vorbis; if it used Vorbis, the audio characteristics are preserved at the target bitrate. Opus-in-Ogg is technically valid but breaks some older Theora players, so Vorbis is the safer default.

Can I trim a section of the WebM during conversion?

Yes. In Advanced Options, open the Trim panel, switch from "Unchanged" to "Time Range", and set the start and end timestamps. The trim is applied before encoding, so the output OGV only contains the selected range — useful for cutting a single scene out of a longer screen capture without a separate edit step. If you need an OGV-first workflow for non-OGV sources, MP4 to OGV and MOV to OGV cover the most common starting points.

Does the converter preserve transparency or alpha?

No. WebM with VP9 supports an alpha channel, but Theora does not — it has no alpha codec path at all. If your WebM has transparent regions (common for VP9 alpha screen recordings or sticker exports), those regions will be flattened to black or whatever background the encoder chooses. Keep the source as WebM, or convert to a transparency-aware format like animated WebP if you need to preserve alpha.

What's the maximum file size and resolution I can upload?

Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours. Very large files (multi-GB) take longer because Theora encoding is CPU-bound and slower than VP9 — for those, trimming to the needed segment first is recommended. Resolution presets go from 144p up to 4320p (8K), though Theora was never optimized for resolutions above 1080p and quality at 4K+ will be poor relative to file size. For 4K source material, consider keeping VP9 in WebM unless you have a strict OGV requirement.

How does this compare to converting OGV back to WebM?

The reverse direction (OGV to WebM) almost always produces a smaller file at equivalent quality because VP9 is more efficient than Theora. Round-tripping WebM → OGV → WebM is lossy at every stage and not recommended; if you need both formats, convert from your highest-quality master to each target independently rather than chaining them.

Is this conversion done in my browser or on a server?

files are processed on our servers and deleted automatically after a few hours and are not retained server-side after your session ends. There's no account requirement, no email gate, and no watermark on the output. For very large or batch jobs that exceed comfortable browser memory, queue the files in smaller batches.