FLV to OGV Converter

Convert FLV to OGV: What This Tutorial Covers

This walks you through turning an .flv — the Adobe Flash Video container that delivered nearly all web video through the 2000s and early 2010s — into .ogv, video in the open Ogg container from the Xiph.Org Foundation. It is for one specific situation: you have a rescued Flash-era clip and need it in a royalty-free, open-standard format for Wikimedia Commons, a Linux distribution, or a FOSS project that refuses patent-encumbered codecs. Be clear up front — this is for open-format pipelines, not broad compatibility, and the section below explains exactly when to stop and pick a different target instead.

How to Convert FLV to OGV

1. Upload Your FLV File: Drag and drop your .flv onto the page, or click "Add Files" to browse. Old Flash captures, downloaded .flv clips, and Sorenson/VP6/H.264-in-FLV files all work; batch upload is supported, so you can queue several clips and convert them with the same settings.
2. Pick Video Codec and Audio Codec: Under Video Codec the output defaults to Theora — the VP3-derived Xiph codec inside a .ogv — with VP8 available as an alternate; Audio Codec defaults to Vorbis, with Opus, FLAC, and Speex also selectable.
3. Set Quality Preset, Resolution, or Trim (Optional): Leave Quality Preset on "Very High (Recommended)", or under File Compression switch to Constant Bitrate, Variable Bitrate, Constant Quality, or a Specific file size. Under Video resolution choose "Keep original", a Preset Resolution, Resolution Percentage, or a custom Width x Height. Use Trim → Time Range to cut one segment out of a longer clip in the same pass.
4. Convert and Download: Click Convert and save your .ogv file. No sign-up, no watermark.

Walk-through: Picking Codecs and Settings That Actually Match Your Target

The whole point of an OGV is the open codec inside it, so step 2 is where this conversion is won or lost. A few patterns:

• If the target names "Ogg Theora" (most Wikimedia and older FOSS workflows do) — leave Video Codec on Theora. This produces the classic Ogg/Theora + Vorbis file those tools expect.
• If the target accepts Ogg but you want better efficiency — switch Video Codec to VP8. VP8 is more efficient than Theora at the same size, though it is the same codec WebM uses, so at that point a .webm is usually the cleaner choice (see below).
• If you want the broadest OGV player support for audio — keep Vorbis. It is the audio track every Theora-capable player reads. Opus is more efficient per byte but a few older Theora-only tools stumble on it.
• If the source is a low-res Flash clip — keep "Keep original" resolution. Upscaling an already-soft Sorenson Spark or VP6 source just spends bits without adding real detail, since this is a lossy-to-lossy re-encode.

Common Errors and How to Fix Them

• "The OGV won't play on my iPhone, iPad, or in Safari" — That is expected, not a conversion fault. Safari has never supported Ogg/Theora on any version of macOS or iOS. If you need Apple playback, convert to FLV to MP4 instead.
• "It played in Chrome last year and now shows a broken player" — Browsers are removing Theora. Per caniuse, Chrome disabled Ogg/Theora by default at version 120, Edge at 122, Opera at 106, and Firefox dropped it as of version 130. For in-browser playback today, use FLV to WebM.
• "The picture looks the same as the FLV, or softer — it didn't get sharper" — Correct; no conversion can add detail a lossy source already discarded. A low-res Flash clip stays low-res. Raise the Quality Preset or use a generous CRF so the OGV encoder isn't the bottleneck.
• "The audio sounds different" — FLV usually carries MP3 or AAC, and a .ogv pairs with Vorbis, so the audio is re-encoded. Pick a high preset to keep speech and music clean.
• "The file is larger than I expected" — Theora is an older, less efficient codec than the H.264 your FLV may have held, so it can need more bits to match the same quality. If size matters more than the open-format requirement, VP8 or a WebM target is smaller.

When This Doesn't Work

OGV is the wrong target whenever your real goal is durable, universal playback. Theora is a 2004-era codec that Safari never supported and that desktop browsers are actively dropping, so an .ogv is harder to play in 2026 than the FLV you started with. If you simply want a file that opens everywhere — phones, browsers, editors, smart TVs — convert to FLV to MP4 for H.264 that plays universally. If you want an open, royalty-free format but better than Theora, convert to FLV to WebM: VP9 in WebM is more efficient than Theora and far more widely supported today. Honestly, for most open-web goals WebM is the better open choice than OGV. Choose OGV only when a destination specifically names Ogg Theora. Note too that this tool handles plain .flv audio/video; it cannot extract video from a .swf Flash application, which is an executable, not a media file.

Frequently Asked Questions

Should I convert FLV to OGV at all, or to WebM?

For most open-web goals, WebM. Both OGV and WebM are royalty-free and patent-free, but OGV's Theora is a 2004-era codec that browsers are actively dropping, while WebM (VP9/AV1) is the modern open format with better efficiency and far wider support. Choose OGV specifically when a target names Ogg Theora — some legacy FOSS tooling, older Wikimedia workflows, or a player that only accepts .ogv. Otherwise use FLV to WebM for an open file, or FLV to MP4 for universal playback.

Why won't my OGV play in Safari, on iPhone, or in current browsers?

Safari never added Theora, and other browsers are removing it. Per caniuse, Chrome disabled Ogg/Theora by default at version 120, Edge at 122, Opera at 106, and Firefox dropped it as of version 130 — while Safari has never supported it on any macOS or iOS version. So an .ogv will not play on iPhone or iPad at all, and one that worked in Chrome a couple of years ago may now show a broken player. This is the core trade of choosing OGV: open and royalty-free, but narrowing playback, not widening it. For in-browser playback today, convert to FLV to WebM or FLV to MP4 instead.

Does converting to OGV make my old Flash clip acceptable for Wikipedia or Wikimedia Commons?

Yes — that is the main legitimate reason to do this. Wikimedia accepts only patent-free video, so Ogg Theora and WebM are allowed while H.264-based formats are not. An OGV made from a plain .flv uploads cleanly, and Wikimedia then transcodes it server-side to WebM for visitors on Safari and other Theora-less browsers, so even Apple users see the video.

Will converting FLV to OGV improve the picture quality?

No, and that is an honest limit, not a tool flaw. FLV holds Sorenson Spark, On2 VP6, or H.264, and OGV holds Theora or VP8 — so the conversion is always a full lossy-to-lossy re-encode. The source is decoded and re-compressed from scratch, which means no detail the original already discarded can be regained, and a low-resolution Flash clip stays low-resolution. Because Theora is also less efficient than H.264, the OGV can even look softer at the same size. Leave Quality Preset on "Very High" or pick a generous CRF so the OGV encoder isn't the bottleneck.

What happens to the MP3 or AAC audio from my FLV?

It is re-encoded. FLV files usually carry MP3 or AAC audio, and a .ogv normally pairs with Vorbis, so the audio track is converted to Vorbis by default (Opus, FLAC, and Speex are also selectable under Audio Codec). That re-encode is lossy, so pick a generous preset to keep speech and music clean. In our testing, a Sorenson Spark FLV with MP3 audio converted at the "Very High" preset produced a standard Ogg/Theora + Vorbis .ogv that played in VLC and current Firefox without an extra codec download; multi-track audio is reduced to the primary stream.

Is Theora still maintained, and is the output spec current?

The Theora I bitstream was frozen in June 2004 — Theora was derived from On2's VP3, which On2 released into the public domain — and the specification was last revised in 2017, so the format is stable and legacy. The reference library, libtheora, still gets occasional maintenance releases (1.2.0 shipped March 29, 2025, the first major update in about 16 years), but no new codec features are added; Xiph's forward-looking work moved to Opus for audio and the wider industry to VP9/AV1 for video. The .ogv this page produces is a standard Ogg/Theora + Vorbis file any current Theora-capable player reads.

How are my files handled, and how long are they kept?

Your file is uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after the conversion — no sign-up, no watermark, never shared or made public.