Proxy editing is a video editing workflow in which the editor works with lightweight, lower-resolution copies of the original footage, called proxies, and switches back to the full-quality original media for color grading, finishing and export. In video editing, it allows smooth playback and fast cutting of demanding material such as 6K RAW or long GOP 4K files on ordinary computers.
The principle is older than digital editing: film editors once cut work prints instead of the camera negative. In non-linear editing, the same idea is implemented by keeping proxies and originals linked to the same clips, so every edit decision applies to both versions.
How proxy editing works
Proxy editing works by separating decision-making from final image quality. The editing application creates or imports a proxy file for each original clip and stores a link between them, so the timeline references the same clip whichever version is played.
The workflow has four stages. First, the footage is ingested and proxies are generated in the background or during transfer. Second, the editor cuts with proxies enabled. Third, the project is switched back to the originals for color, effects and quality checks. Finally, the timeline is rendered from the original media, never from proxies.
Proxy editing succeeds only when proxies match their originals in essential properties. The table lists what must match and why.
| Property | Requirement | Reason |
|---|---|---|
| Duration and frame rate | Identical | Edits must land on the same frames |
| Timecode | Identical start timecode | Reliable relinking and conforming |
| Aspect ratio | Identical frame shape | Correct framing, crops and positions |
| Audio channels | Same number and order | Syncing and audio mixing stay valid |
| File name or reel name | Matching naming scheme | Applications locate originals automatically |
Proxy formats and settings
Good proxy formats are intra-frame codecs at reduced resolution. Because every frame is compressed independently, the computer can decode, scrub and play backwards without reconstructing long groups of pictures, which is the main cause of sluggish timelines.
| Proxy format | Typical resolution | Strength | Limitation |
|---|---|---|---|
| ProRes Proxy or ProRes LT | Half or quarter resolution, or 1080p | Very smooth editing, wide support | Larger files than H.264 |
| DNxHR LB | Half resolution or 1080p | Cross-platform intermediate | Moderate file size |
| H.264 or H.265 proxies | 720p to 1080p | Very small files, camera-generated | Long GOP is heavier to decode |
| Camera-recorded proxies | Often 1080p or lower | Available immediately on set | Settings and naming vary by model |
A practical starting point is half resolution of the source, capped at 1080p, in an intra-frame codec at low data rate. Quarter resolution is often sufficient on laptops, while monitoring focus or fine detail may need full HD proxies.
Proxy editing compared with related workflows
Proxy editing is one of several ways to make heavy footage editable. It differs from optimized media and transcoding in that the proxy is never meant to be the final source.
| Workflow | What is edited | Final export from | Best for |
|---|---|---|---|
| Native editing | Original camera files | Originals | Powerful systems, light codecs |
| Proxy editing | Low-resolution linked copies | Originals | Heavy codecs, laptops, shared projects |
| Optimized or intermediate media | Full-resolution intra-frame copies | Copies or originals | Smooth editing with full detail |
| Offline and online editing | Low-quality copies, then reconform | Originals in a finishing system | Large productions, separate grading |
The traditional offline and online model is the large-scale ancestor of proxy editing. Today the conform often happens inside a single application, but projects that move to a separate grading suite still use edit decision lists or XML to relink originals there.
Setting up a reliable proxy workflow
A reliable proxy workflow is mostly about organization and naming. Proxies should sit in a clear folder structure next to or mirroring the originals, and their file names should match so that relinking succeeds automatically.
- Generate proxies at ingest so editing can start while originals are backed up.
- Test relinking early with a few clips before cutting a full project.
- Add a burned-in proxy label or use the application’s indicator to avoid confusion.
- Check effects at full resolution, because stabilization, keying and tracking behave differently on proxies.
- Keep originals online for the final grade and export.
Proxy editing also supports remote and collaborative work. Small proxy files can be shared over ordinary network connections or cloud storage, while the originals remain on central storage until the finishing stage.
Common proxy editing problems
Most proxy failures occur at the link between proxy and original. The table connects typical symptoms with their causes and fixes.
| Symptom | Likely cause | Fix |
|---|---|---|
| Clips will not relink | Renamed files or different timecode | Restore naming, regenerate proxies |
| Export looks soft | Rendered from proxies | Disable proxies before export |
| Framing shifts after relinking | Proxy aspect ratio differs | Create proxies with matching frame shape |
| Missing audio channels | Proxy preset dropped tracks | Use a preset that keeps all channels |
| Color differs between versions | Different color space or LUT handling | Apply grading only on originals |
Understanding it simply
High-quality video files are huge, and many computers struggle to play them smoothly while editing. Proxy editing solves this by making small, easy copies of every clip for the editing work.
The editor cuts the film with the small copies, which play without stutter. At the end, the software swaps the small copies for the originals, so the finished video keeps its full quality. It is like planning a house with a cardboard model before building with real materials.
Applied in practice
A freelance editor receives a corporate film shot on two cameras in 6K RAW, about 2 terabytes of footage. On her laptop, the native files stutter during playback, so she generates ProRes Proxy files at 1920 x 1080, which take up only a small fraction of the original storage.
She completes the multicam edit on the laptop, using the proxies for smooth switching between angles. Before handing off, she connects the external drive with the originals, disables proxies and checks every stabilized shot at full resolution, where one shot needs a slightly larger crop.
The final export is rendered from the 6K originals to a 4K master. The client receives full-quality output, while the editing itself required only a modest laptop and portable storage.