OGV Compressor

Compress OGV Online — Free, No Watermark

OGV is an Ogg container holding Theora video, the Xiph.Org codec that once powered open-web video. Compressing an OGV in place lowers its bitrate or resolution to shrink the file — but because Theora is now a legacy codec that current browsers no longer play by default, converting to WebM (VP9) or MP4 (H.264) usually produces a smaller, far more compatible result than re-compressing Theora. This page does both: it compresses OGV directly, and points you to the conversion path when that's the smarter move. Files upload over an encrypted connection, are processed on our servers, and are deleted automatically after a few hours — no sign-up, no watermark.

OGV (Ogg Theora) at a Glance

OGV vs Modern Video Formats

How to Compress OGV Files Online

1. Upload Your OGV Files: Drag and drop or click "Add Files" to select one or more .ogv clips. Batch is supported — drop several at once and each is processed separately.
2. Pick a Compression Mode: Choose Target file size (%) for predictable shrinkage (default 80%), Specific file size to hit an exact MB cap, Quality Preset (Highest through Lowest, with Very High recommended), or Constant Quality to lock perceived quality with a CRF value. Auto Scale picks a resolution that meets the size target automatically.
3. Set Codec, Resolution, and Trim (Optional): Under Advanced Options, keep Video Codec on Theora for a standard .ogv or switch to VP8; set the Audio Codec (Vorbis by default, or Opus, FLAC, Speex); drop the resolution preset (1080p to 720p) or use the Trim time range to cut unused footage.
4. Compress and Download: Click Compress. Files process on our servers and download individually or as a ZIP — no sign-up, no watermark.

Frequently Asked Questions

Should I compress OGV or convert it to WebM or MP4?

If you must keep the .ogv format for a legacy Ogg/Theora workflow, compress it in place. For almost everything else, convert instead: Theora's compression sits well behind VP9 and H.264, and current browsers no longer play Theora by default. In our testing, re-encoding an OGV to VP9 WebM at matched visual quality consistently produced a smaller file than re-compressing the Theora stream in place — Theora simply cannot reach VP9's efficiency. See OGV to WebM or OGV to MP4.

Why won't my OGV file play in Safari or my browser?

Safari has never supported Ogg Theora, Chrome disabled Theora playback by default in version 120 and Chromium removed the decoder in 123, and Firefox disabled it by default in version 126, with Edge and Opera following Chromium (per caniuse, global support now sits near 8%). Shrinking the file does not fix this — the incompatibility is the Theora codec itself. Converting OGV to WebM or MP4 is the reliable fix, since both play natively across current browsers.

How much can I shrink an OGV file?

It depends on the source, but re-compressing an existing OGV typically yields 20-50% with a Target file size (%) setting or a lower Quality Preset, and more if you also drop the resolution or trim dead footage. Because Theora is already a low-efficiency codec, gains from re-compressing it are modest compared with converting to VP9 or H.264, which repack the same footage far more tightly.

Trimming is the highest-leverage move when only part of the clip matters: footage cut with the Time Range control is never encoded at all, so removing half the runtime removes roughly half the size before any quality trade-off begins.

What does the Theora CRF value do?

When Video Codec is set to Theora, the Constant Quality control exposes a 0-10 quality scale (higher = better quality and larger file), defaulting to 7. Lowering it trades visible quality for size. Because Theora is a low-efficiency codec, dropping the value far enough for a big size cut usually introduces visible blocking on motion — one more reason a VP9 or H.264 re-encode is often the better size play.

Will compressing change the resolution or length?

Compression changes the size in MB, not the duration or frame rate — the clip plays back at the same length unless you use the Trim time range to cut segments. The resolution stays the same unless you pick a lower preset or let Auto Scale reduce it to hit a size target.

Can I keep the file as OGV but make it more compatible?

Not really. The compatibility problem is the Theora codec, not the container or its bitrate, so a smaller Theora file still will not play in browsers that dropped Theora. To gain playback compatibility you have to change codecs, which means converting to WebM (VP9) or MP4 (H.264) rather than compressing in place.

What audio codec does the compressed OGV use?

By default the Ogg container keeps Vorbis audio, the standard Xiph pairing for Theora. You can switch to Opus (newer and more efficient), FLAC (lossless), or Speex under Advanced Options. Opus gives the best quality per bitrate if you are specifically trying to shave audio size out of the file.

Are my OGV files uploaded to a server?

Yes — compression runs on our servers, not in your browser. Files upload over an encrypted connection, are processed, and are deleted automatically after a few hours. There is no sign-up and no watermark. For a preprocessing pass on long clips before compressing, see the Video Compressor.