A conform is the rebuild of the final approved edit at full quality from the original camera media: after picture lock, the offline cut - edited on proxies or low-resolution copies - is recreated frame-for-frame in the online, so what was approved is exactly what gets finished, graded, and delivered. The word covers both the process and the result: "conform the timeline" is the verb; "the conform" is the rebuilt, full-quality timeline itself.
Why conforms exist: offline vs online
The offline/online split is a storage-and-speed tradeoff from the film era that survived into file-based workflows because it still makes sense. Editing happens offline on proxies - lightweight copies that scrub smoothly on ordinary machines - while the online conform relinks that finished edit to the original camera media: 4K/6K/8K RAW, full-quality audio, the real files. Nobody edits 8K RAW from scratch on a laptop if they can help it, and nobody wants to deliver the proxies either. The conform is the bridge between the two: proxy decisions in, original-media quality out.
Where conform sits in the edit ladder
| Stage | What happens | Full quality? |
|---|---|---|
| Dailies | Day's footage synced, reviewed | Copies (viewing) |
| Selects | Best takes pulled into a stringout | No - proxies |
| Rough cut / fine cut | Story shaped, notes rounds run | No - proxies |
| Picture lock | Edit declared final; the reference point | No - proxies |
| Conform | Locked edit rebuilt from original media | Yes - the online |
| Finish | Grade, mix, titles, delivery master | Yes |
The ladder order is the reason review discipline matters upstream: everything the conform inherits - the locked cut, the approved versions, the "final" everyone signed - was decided in proxy quality, and the conform is where those decisions meet full-resolution reality. Shots that looked clean on proxies occasionally do not survive 4K (a soft focus pull, a wire in frame) - which is why the last review pass belongs after the conform, on the online timeline, not just before it.
Why conforms go wrong
Conform failures are almost never rendering failures - they are bookkeeping failures surfacing at the worst possible moment. The classic four: timecode mismatches (media re-wrapped or synced files whose timecode drifted from the offline's reference), renamed or reorganized media (the relink needs names and paths that survived the edit), wrong take versions (the offline referenced take 4; the media folder's take 4 is not the take 4 the editor saw), and post-lock edits (a "tiny" trim after lock that nobody conformed, so the online quietly differs from the approved cut). Every one of these is prevented upstream by the same discipline: freeze the cut at lock, keep versions explicit, keep the approval record - the reasons picture lock is treated as a hard gate rather than a suggestion. The lock-to-conform chain is one reason frame-accurate approval records matter: frame-accurate review means "approved" refers to an exact cut, not an approximate one.
Conform vs export
These get confused because both produce "the finished video," but they answer different questions. An export renders your timeline's current state to a file - what you do for a review cut, a client preview, or (on small projects) the actual deliverable. A conform rebuilds the timeline itself at full quality from original media - a preparatory step for finishing, not a render at all. Small projects that edit native media all along (a talking-head shot on a camera original, cut and delivered directly) effectively skip the conform: their online was their offline. The conform step earns its complexity in projects with proxy workflows, multiple media sources, or finishing stages handled by other artists.
Do you always need a conform?
No - the honest test is whether you edited at less than delivery quality. If the edit ran on proxies or lower-resolution copies, a conform (or an online relink doing the same job) stands between lock and delivery. If the edit ran on the delivery-quality media itself, you are already online. What never changes: the approval gate before finishing. Whatever your ladder looks like, the cut that enters the online should be the cut a human signed off on - the stage-by-stage version of that discipline is in the edit ladder guide, and the related terms are in the video review glossary.
FAQ
What is a conform in video editing?
The rebuild of the final approved (picture-locked) edit at full quality from original camera media. The offline edit made on proxies is recreated frame-for-frame in the online, so the approved decisions carry into full-resolution finishing exactly as made.
Is conform the same as online editing?
They overlap heavily and people use them interchangeably. "Online" is the finishing phase (full-quality timeline, grade, mix, titles); the conform is the step that builds the online timeline from the offline edit. Strictly: conform is the rebuild action; online is the phase it enables.
What is a conformed master?
Less commonly, "conform" describes the delivered program itself - a master that exactly matches the approved edit in content, duration, and (for broadcast delivery) technical spec. In that usage, "conformed to spec" means the master complies with the broadcaster's technical requirements as well as the locked creative.
Does every project need a conform?
Only projects that edited below delivery quality. If the whole edit ran on the original (delivery-grade) media, the timeline is already online and a separate conform adds nothing. Proxy-based edits, multi-source projects, and anything with a separate finishing team all need the conform step.
How does review fit around a conform?
Twice: the binding approval happens at picture lock, before the conform - that is the cut the conform must reproduce - and a final review pass belongs after the conform, on the full-quality online, because proxy-quality approvals occasionally miss things that only appear at full resolution. Both gates run on the same frame-accurate review loop.