What Is ProRes? Apple's Editing Codec Explained (2026)
What Is ProRes? Apple's Professional Editing Codec Explained
If you've ever edited video on a Mac, exported a master file, or wondered why a few minutes of footage swallowed dozens of gigabytes of disk space, you've almost certainly encountered ProRes. So what is ProRes, exactly? It's Apple's family of professional intermediate video codecs — designed not to make files small, but to make editing fast, smooth, and visually lossless.
ProRes sits in a completely different category from the codecs most people know. H.264 and HEVC are delivery codecs: their whole purpose is to shrink video down to the smallest possible size for streaming, sharing, and storage. ProRes is a mezzanine codec, built for the opposite priority — preserving image quality and making footage effortless to work with during the edit. Understanding that distinction is the key to understanding everything else about it.
Apple introduced ProRes in 2007 alongside Final Cut Pro, and it has since become the de facto standard for professional post-production, broadcast delivery masters, and high-end editing pipelines. In this guide we'll cover what ProRes is, why editors rely on it, the full ProRes family and their data rates, and how ProRes compares to H.264 and HEVC. If you're new to codecs in general, our guide on what a video codec is is a good starting point.
Intermediate vs Delivery: The Core Idea Behind ProRes
To understand ProRes, you first need to understand the difference between an intermediate codec and a delivery codec. This single concept explains almost every design decision Apple made.
A delivery codec like H.264 or HEVC is optimized for the final product. It uses aggressive inter-frame compression — storing one full frame and then only the changes across the following frames (called P-frames and B-frames). This is incredibly efficient for storage and streaming, but it makes editing painful: to display any single frame, the decoder often has to reconstruct several surrounding frames first. Scrubbing backward, trimming precisely, and applying effects all become computationally heavy.
An intermediate codec like ProRes does the reverse. It uses intra-frame compression, meaning every single frame is compressed and stored independently — no frame depends on any other. This makes each frame instantly and cheaply decodable. Jump to any point in the timeline and the editor shows that frame immediately, with no reconstruction chain. The tradeoff is size: because far less redundancy is squeezed out, ProRes files are much larger.
ProRes is also near-lossless, often described as visually lossless. It discards so little image information that even after repeated rounds of color grading, compositing, and re-encoding, the picture holds up. Delivery codecs degrade with each generation of re-encoding; a good intermediate codec barely does. That's exactly why post-production pipelines edit in ProRes and only encode to H.264 or HEVC at the very last step.
The ProRes Family: Variants and Data Rates
ProRes isn't a single codec — it's a family, letting editors trade quality against file size depending on the job. Every variant is intra-frame and edit-friendly; they differ mainly in how much data they keep per frame. Here's the full lineup with approximate data rates at 1080p 29.97 fps (rates scale up dramatically at 4K).
| ProRes variant | Approx. data rate (1080p) | Chroma / bit depth | Typical use case |
|---|---|---|---|
| ProRes 422 Proxy | ~45 Mbps | 4:2:2, 10-bit | Offline editing, rough cuts on light hardware |
| ProRes 422 LT | ~102 Mbps | 4:2:2, 10-bit | Smaller masters where storage is tight |
| ProRes 422 | ~147 Mbps | 4:2:2, 10-bit | Standard broadcast/editing quality |
| ProRes 422 HQ | ~220 Mbps | 4:2:2, 10-bit | High-quality masters, broadcast delivery |
| ProRes 4444 | ~330 Mbps | 4:4:4:4, 12-bit + alpha | Motion graphics, VFX, compositing with alpha |
| ProRes 4444 XQ | ~500 Mbps | 4:4:4:4, 12-bit + alpha | Highest-quality HDR and VFX finishing |
| ProRes RAW | Variable | Sensor RAW | Camera-original capture, maximum grading latitude |
A few things stand out. The 422 variants use 4:2:2 chroma subsampling at 10-bit and cover the vast majority of editing work — 422 and 422 HQ are the workhorses of professional post. The 4444 variants step up to full 4:4:4:4 sampling at 12-bit, and crucially they carry an alpha channel, which is why they're the standard for motion graphics and visual effects that need transparency. ProRes RAW, introduced in 2018, is different again: instead of debayered video it stores minimally-processed sensor data, giving colorists maximum latitude to adjust exposure and white balance in post, similar to shooting RAW stills.
To put the data rates in perspective: a single minute of ProRes 422 HQ at 1080p is roughly 1.6 GB. The same minute in H.264 for web delivery might be 60–100 MB. That's the size gap between an editing codec and a delivery codec — and it's entirely by design.
Why Editors Choose ProRes
Given how enormous the files are, why is ProRes the professional standard? Three reasons, all flowing from its intermediate-codec design.
It's fast to scrub and edit. Because every frame decodes independently, timelines respond instantly. There's no lag when you jump around, play in reverse, or trim frame-by-frame. Editing long-GOP delivery footage (like H.264 straight off a consumer camera) can feel sluggish on the same hardware, which is why many editors transcode to ProRes before they even start cutting.
It preserves quality through the pipeline. A finished edit passes through color grading, effects, titles, and multiple renders. Each stage may re-encode the footage. Because ProRes is near-lossless, the image survives all of that without visible degradation. Grade a delivery codec five times and you'll see artifacts accumulate; grade ProRes five times and it still looks clean.
It's a universal interchange format. ProRes is decodable on virtually any modern Mac and is widely supported across professional editing and finishing software — Final Cut Pro, Premiere Pro, DaVinci Resolve, Avid, and more. Broadcasters and streaming platforms frequently require ProRes 422 HQ as the delivery master format because they know it's a clean, high-quality source to encode from.
The cost, of course, is storage and bandwidth. ProRes projects demand fast SSDs and large drives, and the files are impractical to email, upload, or stream directly. That's a feature, not a bug — ProRes was never meant to leave the edit suite in its native form.
ProRes vs H.264 and HEVC: Different Jobs, Not Rivals
People often ask whether ProRes is "better" than H.264 or HEVC, but the comparison is a category error. They're built for different stages of the video lifecycle.
| Aspect | ProRes | H.264 / HEVC |
|---|---|---|
| Codec type | Intermediate / mezzanine | Delivery |
| Compression | Intra-frame (every frame independent) | Inter-frame (P-frames, B-frames) |
| Quality | Near-lossless / visually lossless | Lossy, tuned for perceptual quality |
| File size | Very large (5–20x delivery codecs) | Small, optimized for streaming |
| Best for | Editing, grading, VFX, masters | Sharing, uploading, streaming, storage |
| Editing performance | Excellent (instant frame access) | Heavier (frames must be reconstructed) |
| Playback everywhere | Limited (pro tools, Mac) | Universal (phones, browsers, TVs) |
H.264 remains the most compatible delivery codec on earth — it plays on essentially every device and browser. HEVC (H.265) delivers roughly the same quality at half the size and is the modern default for Apple hardware capture; our HEVC codec explained guide covers it in depth. Newer delivery codecs push efficiency even further — see what the AV1 codec is and what H.266 (VVC) is for where compression is heading.
The correct workflow uses both categories: edit in ProRes, deliver in H.264 or HEVC. You ingest or transcode to ProRes for the smooth, high-quality editing experience, then export a small delivery file when the project is finished. Trying to edit directly in a delivery codec is slow; trying to distribute ProRes is impractical. Each codec is excellent at the job it was built for.
ProRes on the Mac and iPhone
ProRes is an Apple technology, so unsurprisingly it's most at home in the Apple ecosystem.
Final Cut Pro uses ProRes as its native intermediate and render format. When you edit in Final Cut, background renders and optimized media are typically ProRes under the hood, which is a big part of why the app feels so responsive with heavy timelines. Our guide on how to export video from Final Cut Pro walks through choosing between a ProRes master and a compressed delivery file at export time.
Apple Silicon Macs include a dedicated hardware ProRes encode and decode engine on the Pro, Max, and Ultra chips. That media engine accelerates ProRes work directly in silicon, so professionals can play back and export multiple streams of ProRes without taxing the CPU. It's one of the clearest examples of Apple building hardware around its own codec.
iPhone recording brought ProRes to consumers. Starting with iPhone 13 Pro, Apple's phones can record video directly in ProRes 422 — a genuinely professional capture format in your pocket. The catch is storage: ProRes files are so large that on lower-capacity iPhones the maximum ProRes recording resolution is capped, and even a few minutes of footage can consume several gigabytes. It's fantastic for quality, demanding on space. For a broader look at what plays where, see our guide to Mac video file formats.
The File-Size Tradeoff (And How to Manage It)
Everything good about ProRes — the instant scrubbing, the near-lossless quality, the clean multi-generation editing — comes from one decision: keep more data. And keeping more data means bigger files. A short documentary shot in ProRes 422 HQ can easily run into hundreds of gigabytes. A few minutes of ProRes from an iPhone can fill the storage a whole photo library would use.
That's completely fine during editing. It becomes a problem the moment editing ends. You can't email a 40 GB ProRes master. You can't upload it to most platforms without them re-encoding it anyway. You can't stream it. And you certainly don't want to archive dozens of them at full size if you don't need to. The final step of any ProRes workflow is converting to a delivery codec — and that's where a dedicated Mac compression tool earns its place.
How Compresto Helps With ProRes Files
ProRes is superb for editing, but the exports are enormous — and once you're done editing, you almost never need to keep the footage in ProRes for delivery, sharing, or long-term storage. That's exactly the gap Compresto fills.
Compresto is a native macOS app that compresses your finished ProRes exports down to H.264 or HEVC using Apple's hardware-accelerated VideoToolbox engine. On Apple Silicon, that means the conversion runs on the dedicated media engine rather than grinding the CPU — so a large ProRes master compresses quickly, quietly, and without slowing down the rest of your Mac. The result is a delivery file that's a small fraction of the original size while remaining visually indistinguishable for normal playback.
In practice, a multi-gigabyte ProRes export can shrink to a modest H.264 or HEVC file suitable for uploading to YouTube, sending to a client, or archiving — with no manual FFmpeg commands to remember. You keep ProRes for the edit, then let Compresto handle the conversion to a practical, shareable delivery format. It's the natural last mile of a ProRes workflow: edit at full quality, deliver at a fraction of the size.
FAQ: ProRes
Q: What is ProRes used for?
ProRes is an intermediate (or mezzanine) codec used during video editing. Because it's intra-frame and only lightly compressed, it scrubs and edits smoothly and preserves near-original image quality through multiple generations of color grading and effects. It's designed for the editing stage, not for final delivery or streaming.
Q: Is ProRes better than H.264?
For editing, yes — ProRes decodes far more easily and holds up better through repeated re-encodes. For delivery and sharing, no — H.264 and HEVC produce files a fraction of the size at comparable perceptual quality. They serve different jobs: ProRes for the edit, H.264/HEVC for the final export.
Q: Why are ProRes files so large?
ProRes uses light, intra-frame compression to keep every frame independently decodable and near-lossless. Far less data is discarded than in delivery codecs like H.264, so files can be 5–20x larger. A minute of ProRes 422 HQ at 1080p is roughly 1.6 GB.
Q: Can iPhone record in ProRes?
Yes. iPhone 13 Pro and later can record video in ProRes 422 directly. On models with less storage the maximum ProRes recording resolution is limited, because the files are so large that a few minutes can consume several gigabytes.
Q: How do I make ProRes files smaller for sharing?
Convert them to a delivery codec once editing is done. On a Mac, Compresto compresses ProRes exports to H.264 or HEVC using hardware acceleration, cutting file size dramatically while keeping the video visually identical for playback and upload.
New to codecs? Our guide on what a video codec is explains the fundamentals, and HEVC codec explained covers the delivery codec you'll most often export ProRes to on a Mac.
Download Compresto for Mac and turn your huge ProRes exports into small, shareable H.264 or HEVC files with hardware-accelerated speed — no quality loss you'll ever notice.