How To Change Aspect Ratio
in DaVinci Resolve
Project settings, per-timeline overrides, Cut page presets, Output Blanking for cinematic bars, Smart Reframe — and the one export setting that silently snaps everything back to 16:9.
The Four Places Aspect Ratio Lives
Most "change aspect ratio in Resolve" tutorials jump straight to Project Settings — and that's why so many editors end up with a vertical timeline, a shrunken clip floating in black, and an export that somehow came out 16:9 anyway. The real answer is that aspect ratio is controlled at four independent levels in DaVinci Resolve, and each one can silently override the one before it.
The four levels are: the project (the default every new timeline inherits), the timeline (which can break away from the project and keep its own resolution), the clip (how each piece of footage is scaled and positioned inside the frame), and the render (what the Deliver page actually writes to disk). Change one level without checking the others and Resolve will happily fit your frame inside a mismatched frame inside another mismatched frame — which is exactly how footage ends up postage-stamped in the middle of black.
Pick your method based on what you actually need, then jump straight to it. Every method below works in the free version of Resolve unless marked otherwise.
Decide your delivery ratio before you place text, titles, or graphics. Footage can be rescaled and reframed after a ratio change; a lower-third that was positioned for 16:9 will land somewhere useless in a 9:16 frame and has to be repositioned by hand. Lock the frame first, decorate second.
Aspect Ratios & Resolutions Worth Memorising
Resolve asks for pixel dimensions, not ratios — so you need the numbers. Width always comes first: a vertical Full HD timeline is 1080 × 1920, and typing 1920 × 1080 by muscle memory gives you a horizontal timeline. It's the single most common data-entry mistake in vertical workflows, and at least one popular tutorial online teaches the swapped values as gospel.
| Ratio | Resolution (W × H) | Where It's Used |
|---|---|---|
| 16:9 horizontal | 1920 × 1080 · 3840 × 2160 | YouTube, TV, client masters — the default everywhere |
| 9:16 vertical | 1080 × 1920 · 2160 × 3840 | TikTok, Reels, YouTube Shorts |
| 1:1 square | 1080 × 1080 | Instagram feed, Facebook feed ads |
| 4:5 portrait | 1080 × 1350 | Instagram feed posts (maximum feed height) |
| 2.39:1 scope | 1920 × 803 · 3840 × 1608 · 4096 × 1716 | Cinematic widescreen — or fake it with Output Blanking (Method 4) |
| 4:3 classic | 1440 × 1080 | Archival, retro looks, documentary inserts |
For any ratio Resolve doesn't offer as a preset, keep your width and divide: height = width ÷ ratio. A 2.39:1 UHD timeline is 3840 ÷ 2.39 ≈ 1608, so enter 3840 × 1608 as a Custom resolution. Round to an even number — codecs prefer it.
Project Settings — Change Everything at Once
Project Settings is the master default: every new timeline inherits this resolution unless told otherwise. Set it correctly at the start of a project and you may never need the other three methods. Change it mid-edit and it also updates existing timelines that are still following project settings — but your clips won't reposition themselves (see the reframing section).
Go to File → Project Settings, press Shift + 9, or click the gear icon in the bottom-right corner of the interface. The keyboard shortcut is worth learning — you'll be back in this panel constantly.
In the Master Settings tab, open the Timeline resolution dropdown. Pick a preset, or choose Custom and type your dimensions — width first, then height. For a vertical Reel that's 1080 × 1920.
Leave Pixel Aspect Ratio on Square for anything destined for the web — non-square pixels are a broadcast-era concern. Confirm the Timeline frame rate matches your footage (24, 25, 30…) while you're here, because Resolve locks frame rate once clips hit a timeline.
Click Save at the bottom-right of the panel. The viewer immediately reflects the new frame shape.
💡 If nothing seems to change, your current timeline probably has its own settings and is ignoring the project — that's Method 2 territory.
Timeline settings beat project settings. Any timeline created with "Use Project Settings" unchecked keeps its own resolution no matter what you do in this panel. If you've changed Master Settings and the viewer stubbornly stays the same shape, the timeline has gone independent — fix it at the timeline level instead.
Per-Timeline Settings — Different Ratios, One Project
This is the professional workflow for multi-platform delivery: one project, several timelines, each with its own resolution. It's also how you change the ratio of a single existing timeline. The key in both cases is one checkbox: Use Project Settings. Unchecked, the timeline carries its own format and ignores Master Settings entirely.
Press Ctrl/⌘ + N or go to File → New Timeline. In the dialog, uncheck "Use Project Settings" at the bottom-left — the dialog expands with extra tabs.
Open the Format tab and enter your resolution. Going vertical? Tick "Use vertical resolution" and Resolve swaps width and height for you — one click, no typos, no accidental 1920 × 1080 vertical-that-isn't.
Right-click the timeline in the Media Pool and choose Timeline Settings…. Uncheck Use Project Settings, set the new resolution in the Format tab, and click OK. Clips stay in place; only the canvas changes shape.
Delivering several formats? Finish the master first, then right-click it in the Media Pool → Duplicate Timeline once per format. Give each duplicate its own resolution via Timeline Settings, rename them clearly ("Master 16:9", "Reels 9:16", "Feed 1:1"), and reframe each version independently.
💡 This beats duplicating whole projects: one set of media, one grade, one place to fix mistakes.
"Project settings are a default, not a law. The moment a timeline unchecks Use Project Settings, it stops listening — and knowing that is the difference between fixing a ratio in ten seconds and fighting it for an hour."
Cut Page — One-Click Format Presets
The Cut page hides the quickest ratio switch in Resolve. A small format dropdown next to the viewer's resize icon (top-right, under the Full Screen control) lists ready-made timeline formats — including portrait and square — and applies them instantly to the current timeline.
Click the Cut icon in the page bar at the bottom of the interface (second from the left, scissors icon).
Look in the top-right corner of the viewer, just below the Fullscreen button — it shows the current timeline's format with a small dropdown arrow. Click it to reveal presets such as 3840 × 2160, 1920 × 1080, 1080 × 1920 (Portrait), and 1080 × 1080 (Square).
Click the format you need — the timeline switches immediately. You can hop back to the Edit page and continue with full tools; the format travels with the timeline.
💡 Limitation: presets only. For 2.39:1, 4:5, or anything custom, use Method 1 or 2 instead.
Output Blanking — Cinematic Bars, Zero Resolution Change
Here's what most guides never mention: for the widescreen film look, you usually shouldn't change the timeline resolution at all. Platforms like YouTube expect standard 16:9 files, and a native 1920 × 803 export just gets letterboxed by the player anyway — with none of the control. Output Blanking mattes your existing timeline to any cinema ratio, the bars render into the export, and your resolution, titles, and delivery specs stay untouched.
With your timeline open, go to Timeline → Output Blanking and choose a ratio — 2.39 for classic scope, 2.35, 1.85, or others. Black mattes appear top and bottom instantly.
The mattes crop your image vertically, so check headroom on every shot. Adjust each clip's Position Y in the Inspector to place subjects nicely inside the visible band — this per-shot vertical reframing is exactly what a real scope finish involves.
Export at your normal 16:9 resolution. The blanking is burned into the output — a 1920 × 1080 file with clean cinematic bars, ready for any platform.
💡 Need the file itself to be 2.39:1 (DCP work, festival specs)? Then skip blanking and set a true custom resolution via Method 1 or 2 — e.g. 4096 × 1716.
Reframing Footage to Fill the New Frame
Changing the timeline is half the work. Your 16:9 footage now sits inside a 9:16 canvas as a small letterboxed band — Resolve's default behaviour is to fit the whole image and pad the rest with black. You have three escalating tools to fill the frame properly, plus one project-wide setting that controls what happens automatically.
| Image Scaling Option | What It Does | Result in a 9:16 Timeline |
|---|---|---|
| Scale entire image to fit | Fits the whole frame inside the timeline (default) | ✗ Small band with black above & below |
| Scale full frame with crop | Fills the timeline completely, cropping the overflow | ✓ Frame filled — sides cropped, centre kept |
| Center crop with no resizing | No scaling; shows the middle of the frame 1:1 | Depends on source size — useful for oversampled 4K-in-HD workflows |
| Stretch frame to all corners | Distorts the image to fill non-proportionally | ✗ Squeezed, unusable for normal footage |
You'll find these under Project Settings → Image Scaling → Input Scaling ("Mismatched resolution files"). Switching the default to Scale full frame with crop is the single fastest way to convert a whole 16:9 edit to vertical: every clip fills the frame automatically, and you only touch the shots where the auto-crop misses the subject.
Select a clip on the Edit page and open the Inspector (top-right). Under Transform, raise Zoom with X/Y linked until the frame fills, then drag Position X to centre your subject.
📐 Exact numbers, since most guides get this wrong: with the default fit scaling, filling a 9:16 frame from 16:9 footage needs a Zoom of about 3.16 — the ratio squared (16/9 ÷ 9/16). If you've already set Input Scaling to "Scale full frame with crop", the frame is filled at Zoom 1.0 and you only adjust position. Any figure like "1.78 fills the frame" assumes non-default scaling and will leave bars on default setups.
Right-click your adjusted clip → Copy (Ctrl/⌘ + C), select the target clips, then press Alt/Option + V for Paste Attributes. Tick only the transform properties (Zoom, Position) and confirm — an entire interview setup reframed in seconds.
For shots where the subject moves, click the keyframe diamond next to Position in the Inspector, set a frame at the start, move the playhead, and reposition — Resolve interpolates a smooth pan-and-scan between keyframes.
DaVinci Resolve Studio includes AI-powered reframing: select clips in a vertical or square timeline, open the Inspector, and find Smart Reframe. Set Object of Interest to Auto (or drag a reference box around your subject) and click Reframe — Resolve analyses the shot and keeps the subject in frame automatically, keyframing the moves for you.
💡 Smart Reframe is the killer argument for Studio if you produce social cutdowns weekly. It turns hours of manual keyframing into a batch operation.
Smart Reframe
AI tracks your subject and reframes 16:9 footage into vertical or square automatically, with editable keyframes.
Studio onlySuper Scale
AI upscaling (2×–4×) that recovers sharpness when heavy crop-zooms leave HD footage soft. Right-click a clip → Clip Attributes.
Studio onlyAdjustment Clips
Drop one over the whole edit (Effects → Adjustment Clip) and apply a single transform to everything beneath it.
Free versionPaste Attributes
Alt/Option + V copies transform settings across any number of clips — the manual editor's bulk-reframe tool.
Free versionInput Sizing (Color page)
Sizing palette transforms that live with the grade — useful when reframing should survive timeline copies.
Free versionOutput Blanking
Timeline-level cinema mattes at any ratio, rendered into the export. The no-resolution-change widescreen method.
Free versionExporting Without the Ratio Snapping Back
The Deliver page is the fourth and final level — and the most common place a correct edit turns into a wrong file. Render presets carry their own fixed resolution, and a preset saved at 1920 × 1080 will happily squeeze your beautiful vertical timeline back into a horizontal frame without a word of warning.
On the Deliver page, under Render Settings → Video, confirm the Resolution matches your timeline. If it doesn't, set it manually — choose Custom and enter the exact timeline dimensions (e.g. 1080 × 1920 for vertical).
MP4 / H.264 is the safe answer for every social platform; H.265 halves file sizes if the destination accepts it. For social vertical, a bitrate around 10–15 Mbps at 1080 × 1920 keeps quality high without upload pain.
Click Add to Render Queue, then Render All. Rendering several timelines in different ratios? Add each timeline's job to the queue separately, checking the Resolution field each time — the field does not automatically follow the timeline you switch to.
💡 Save one render preset per delivery format ("Reels 1080×1920 H264", "YouTube 2160p") and this whole class of mistake disappears.
Troubleshooting Common Failures
These three failures account for nearly every "aspect ratio broken" thread on the Resolve forums — including a long-running Creative COW classic where a working 2.39:1 export mysteriously stopped working between projects. All three have thirty-second fixes once you know which of the four levels is fighting you.
This is two mismatched fits stacking: the clip is letterboxed into the timeline, then that already-padded frame is letterboxed again into a mismatched output or delivery resolution. Fix: set Project Settings → Image Scaling → Output Scaling to Scale full frame with crop, or simply make the Deliver page resolution exactly match your timeline. Either breaks the double-fit and the image fills the frame.
A Deliver page preset with a locked 1920 × 1080 resolution overrode the timeline at render time. Project settings and render settings are controlled independently in Resolve. Fix: on the Deliver page set Resolution to Custom → 1080 × 1920 (or your timeline's dimensions), re-queue, re-render.
Filling a 1080 × 1920 frame from 1920 × 1080 source uses only a 607-pixel-wide slice of the original, scaled up ~1.8× — softness is physics, not a bug. Fixes: shoot or edit from 4K sources so vertical crops still exceed the delivery resolution; or in Studio, enable Super Scale (right-click clip → Clip Attributes → Super Scale 2×) to AI-upscale before the crop. Going forward, frame your shots with a centre-safe zone if vertical cutdowns are part of the delivery.
When the ratio misbehaves, audit the four levels in order: Project → Timeline → Clip → Deliver. One of them disagrees with the others — it's almost always the timeline's "Use Project Settings" checkbox or the Deliver page resolution. Thirty seconds of checking beats an hour of re-editing.
Common Questions & Fixes
How do I change the aspect ratio in DaVinci Resolve without cropping my footage?
Keep the default Scale entire image to fit setting in Project Settings → Image Scaling. Resolve fits the whole frame inside the new timeline and pads the remainder with black bars instead of cropping. And if what you're really after is a cinematic widescreen look, use Timeline → Output Blanking (Method 4) — zero cropping, zero resolution change, and per-shot control over what sits inside the visible band.
What resolution should I use for a 9:16 vertical video?
1080 × 1920 for Full HD vertical — width first, height second. Entering 1920 × 1080 gives you a horizontal timeline, and this exact digit-swap is the most common vertical-workflow mistake. For 4K vertical use 2160 × 3840. The "Use vertical resolution" checkbox in the New Timeline dialog's Format tab sets this correctly with one click.
Why did my clip shrink with black bars on all four sides after I changed the timeline resolution?
Your output or delivery resolution no longer matches the timeline, so Resolve fitted an already-letterboxed frame inside a second mismatched frame — a double letterbox. Set Project Settings → Image Scaling → Output Scaling to Scale full frame with crop, or make the Deliver page resolution match your timeline exactly. Either change fills the frame again.
Why is my export still 16:9 after changing the project settings?
The Deliver page preset carries its own fixed resolution that overrides your timeline at render time — the two are controlled separately in Resolve. On the Deliver page, set Resolution to match your timeline (or choose Custom and type the dimensions) before adding the job to the render queue, then re-render.
Can the free version of DaVinci Resolve change aspect ratio?
Yes — everything structural is free: Project Settings, per-timeline overrides, Cut page presets, Output Blanking, Inspector reframing, Paste Attributes, and adjustment clips. The two paid Studio features in this workflow are Smart Reframe (AI subject-tracking reframe) and Super Scale (AI upscaling) — big time-savers, but conveniences rather than requirements.
What resolution is 2.39:1 cinemascope?
Common true-scope resolutions are 1920 × 803 (HD), 3840 × 1608 (UHD), and 4096 × 1716 (DCI 4K). But unless a delivery spec demands a native scope file, consider keeping a standard 16:9 timeline and applying Timeline → Output Blanking → 2.39 instead — you get identical-looking bars in a platform-friendly 16:9 file.
How do I make 16:9, 9:16, and 1:1 versions of the same edit?
Finish your master edit first. Then right-click the timeline in the Media Pool → Duplicate Timeline, once per format. Open each duplicate's Timeline Settings, uncheck Use Project Settings, and give it the right resolution. Reframe each version — with Smart Reframe in Studio doing the heavy lifting, or Paste Attributes for manual bulk work — and queue each timeline on the Deliver page with a matching resolution.
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