Resize video for Instagram, TikTok, Reels and YouTube — change the aspect ratio to 9:16, 1:1, 4:5 or 16:9 by cropping or adding bars.
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Changes framing, not file size.
Just need the numbers? See the Aspect Ratio Calculator. Also want a smaller file? Use the Video Compressor. Posting to muted feeds? Add captions with the Caption Burn-In Tool.
Upload a video, pick a platform, and download a ready-to-post MP4
Every platform frames video to a different aspect ratio, and uploading the wrong shape means ugly bars, an awkward auto-crop, or a clip that simply looks off. This tool re-frames your video to the exact size a platform expects and exports a standard H.264/AAC MP4 you can post as-is.
| Preset | Aspect ratio | Output size | Best for |
|---|---|---|---|
| Reels & TikTok | 9:16 | 1080×1920 | Instagram Reels, TikTok, Stories, YouTube Shorts |
| Instagram square | 1:1 | 1080×1080 | Instagram and Facebook feed (square) |
| Instagram portrait | 4:5 | 1080×1350 | Instagram feed (portrait) — the tallest feed post |
| YouTube | 16:9 | 1920×1080 | YouTube and any landscape player |
Vertical 9:16 fills a phone screen and is the default for short-form video. The 4:5 portrait takes up more of the Instagram feed than a square without becoming a full Reel, which is why it is a favourite for feed posts. Use 16:9 for YouTube and landscape players.
Crop to fill scales your video up until it covers the whole target frame, then trims the parts that fall outside the new ratio. You get an edge-to-edge picture with no bars, but you lose whatever sat at the cropped edges — keep important action and on-screen text near the centre. Fit with bars scales the entire frame to fit inside the new shape and fills the gaps with black bars, so nothing is cut off at the cost of those bars. As a rule: crop for the most immersive result, add bars when you need to preserve the whole frame.
Yes. If your source is smaller than the platform size, it is upscaled to the standard dimensions (for example 1080×1920) so it still uploads cleanly — that is normal and expected for social video. Output always lands on the exact even dimensions in the table above.
This tool changes the aspect ratio and framing only; it is not a compressor and does not target a file size. If you also need a smaller file, run the result through the Video Compressor. If you only need the math behind a ratio, use the Aspect Ratio Calculator.
Without an account you can resize one file up to 100 MB and 5 minutes. A free account raises that to 200 MB and 10 minutes per file. The length cap keeps each resize fast, because the video is re-encoded while you wait.
Upload your video, choose a preset — Instagram portrait (4:5) or square (1:1) for the feed, or Reels & TikTok (9:16) for Reels and Stories — pick Crop to fill or Fit with bars, and download the new MP4. It is re-framed to the exact size Instagram expects, with no watermark.
Both use a vertical 9:16 aspect ratio, and the standard upload size is 1080×1920. This tool outputs exactly that, so your clip fills the phone screen on Reels, TikTok, Stories and YouTube Shorts.
Crop to fill gives an edge-to-edge picture but trims whatever sits outside the new ratio, so keep faces and text near the centre. Fit with bars keeps the whole frame visible and adds black bars to fill the gaps. Crop for the most immersive look; add bars when you cannot afford to lose any of the frame.
Yes. If your source is smaller than the platform size, it is upscaled to the standard dimensions (such as 1080×1920) so it still uploads cleanly. That is expected for social video — platforms render everything at their target size anyway.
No — this tool changes the aspect ratio and framing, not the file size, and keeps a single fixed quality. If you also need a smaller file, run the resized clip through the Video Compressor, or use Compress Video to Size for an exact target.
Without an account you can resize one file up to 100 MB and 5 minutes. A free account raises that to 200 MB and 10 minutes per file. The length cap keeps each resize fast, because the video is re-encoded while you wait.
VoiceDeck adds AI-powered audio & video review and delivery for your whole team — so every file ships in spec, automatically.
