The best video format for LinkedIn is MP4 with H.264 video and AAC audio, in a 1:1, 4:5, or 1.91:1 aspect ratio at 1080p or lower, but the file wrapper matters less than the pixel dimensions, which is what actually determines how your video looks in the feed. LinkedIn's transcoder re-encodes almost every upload, so a clean MP4 and a clean WebM of the same dimensions end up looking identical once the pipeline finishes. What the transcoder cannot fix is a wrong aspect ratio, a stretched picture, or oversized source footage that gets downscaled with ugly artefacts. If your source video is the wrong size, resizing it locally in the browser with Video Resizer lets you set exact pixel dimensions for LinkedIn before you upload, so the source is already in the right shape when it hits LinkedIn's transcoder.
LinkedIn Video Specs That Actually Matter
LinkedIn's player transcodes uploads, so the file format you upload is a starting point rather than a final word. A handful of properties carry real weight in practice, and only one of them is the container.
- Codec. H.264 video with AAC audio inside an MP4 container is the most reliably accepted combination. LinkedIn also accepts WebM, but MP4/H.264 remains the safest default.
- Resolution. 1080p is the practical ceiling for LinkedIn's player. Anything higher is downscaled, anything lower looks soft on desktop.
- Aspect ratio. 1:1 (square), 4:5 (portrait), and 1.91:1 (landscape) match LinkedIn's player crops without padding or letterboxing.
- File size. Under 200 MB keeps uploads fast and avoids LinkedIn's longer-form restrictions.
- Length. Native posts cap at about ten minutes, and shorter clips consistently outperform long ones in engagement.
The takeaway is that container choice is downstream of dimension and ratio. A correctly sized WebM upload behaves the same in the feed as an MP4 once LinkedIn's transcoder is done. A wrongly sized MP4 still looks wrong no matter how clean the codec is.
Common LinkedIn Aspect Ratios and Dimensions
Picking an aspect ratio is mostly a creative decision, but each ratio has a typical LinkedIn context where it works best.
| Aspect ratio | Common pixel dimensions | Typical LinkedIn use |
|---|---|---|
| 1.91:1 landscape | 1920 × 1008, 1280 × 672 | Sponsored content, articles, desktop feed |
| 1:1 square | 1080 × 1080, 720 × 720 | Personal posts, mobile-first feed |
| 4:5 portrait | 1080 × 1350, 864 × 1080 | Mobile feed, document-style posts |
Landscape works well when your source is horizontal — a slide deck recording, an event panel, or a product demo filmed with a wide camera. Square is the safest all-purpose choice for mixed mobile and desktop viewing because it crops well in both. Portrait 4:5 takes the most vertical real estate in the mobile feed, which is why so many creators crop to this ratio before uploading even when their footage is wider.
Resize a Video for LinkedIn Step by Step
If your source footage is in the wrong ratio or oversized for LinkedIn's pipeline, Video Resizer lets you set the exact pixel dimensions in your browser. The full workflow runs locally — no upload, no server processing.
- Open Video Resizer and choose one local video file. Supported inputs include MP4, WebM, MOV, M4V, and Ogg. Wait for the browser to read the metadata before continuing.
- Enter your maximum width and height. For a LinkedIn square, type 1080 and 1080. For a 4:5 portrait, type 1080 and 1350. Each dimension must be a whole number between 2 and 1920 pixels. Choose Fit if you want the source aspect ratio preserved inside that bounding box; choose Stretch only if you specifically want the exact requested dimensions regardless of distortion.
- Click Resize video. Keep the current browser tab open while the encoder runs in real time. When the WebM file is ready, click Download to save it locally.
The output is a WebM at the dimensions you requested, with any browser-exposed audio track preserved. Because the encoder targets up to 30 fps and uses VP9 or VP8 depending on browser support, the output is broadly compatible with LinkedIn's transcoder.
Fit Mode vs Stretch Mode for LinkedIn
Fit and Stretch solve different problems, and choosing the wrong one is the most common cause of distorted LinkedIn videos.
Fit mode treats your entered width and height as a bounding box. The encoder picks the smaller of the two scale factors, applies it to both source dimensions, and preserves the source aspect ratio. It never crops. Stretch mode uses your requested width and height independently and produces exactly the dimensions you typed, which means the picture can be visibly squished or stretched if the source ratio does not match.
A concrete example: a 1920 × 1080 landscape source (ratio 1.78) being fitted inside a 1080 × 1080 square bounding box. The width scale factor is 1080 ÷ 1920 = 0.5625, and the height scale factor is 1080 ÷ 1080 = 1.0. The encoder picks the smaller value, 0.5625, and applies it to both source dimensions: 1920 × 0.5625 = 1080, and 1080 × 0.5625 = 607.5. Because odd pixel sizes are less reliable with common browser video encoders, the tool rounds 607.5 down to the next even value, 606. The resulting WebM is 1080 × 606 — perfectly ratio-matched to the original landscape source, sitting inside the 1080-square bounding box, with no cropping.
For LinkedIn uploads, Fit is almost always the right choice. Pick Stretch only if you are deliberately reframing footage (for example, converting a landscape source into a square by intentionally squishing it for a stylised look) and you know you want the distortion.
WebM Output and LinkedIn Uploads
Video Resizer produces WebM, not MP4, because it uses the browser's built-in video codecs and avoids a large media dependency or any server processing. LinkedIn generally accepts WebM uploads as part of its standard transcoding pipeline, so a correctly sized WebM behaves the same in the feed as an MP4 once transcoding finishes.
The relevant differences are upstream of the upload step. WebM uploaded directly skips one lossy re-encode pass compared with transcoding an MP4 to MP4. WebM support across LinkedIn's player surface is consistent for native uploads, though some third-party schedulers and analytics tools handle WebM less cleanly than MP4. If your workflow ends in a tool that strictly expects MP4, convert the WebM locally with a dedicated encoder rather than re-uploading to a web service. The browser-based capture pipeline that Video Resizer relies on, documented at MDN's HTMLCanvasElement.captureStream reference, produces WebM streams that LinkedIn's transcoder handles routinely.
For most LinkedIn-only workflows — a personal post, a company page update, a sponsored video — uploading the WebM directly is fine.
When to Skip a Browser Resizer
A local browser resize is the right tool for most LinkedIn posts, but a few situations call for a different workflow. Skip a browser resizer and reach for a desktop encoder when any of the following apply.
- Source is longer than five minutes. Video Resizer caps sources at 500 MiB and five minutes, so anything beyond that falls outside the tool's input range.
- You need MP4/H.264 output specifically. Browser resizers emit WebM; only a dedicated encoder can write a clean MP4.
- You need frame-accurate delivery. Browser encoders run in real time and can drift slightly; a desktop tool with proper frame control is more reliable.
- You need exact bitrate, color-managed output, or preservation of multiple audio tracks and subtitles. A browser resize does not promise any of these, and pretending otherwise produces a misleading export.
For everything else — a 30-second square post, a two-minute vertical clip, a one-minute product reel — resizing locally in the browser is the fastest path to LinkedIn-ready dimensions. If you cross-post the same video to other platforms, the same dimensions often apply to Facebook's mobile feed, and the practical workflow for Facebook is covered in the resize-for-Facebook guide.