Resize Video for Instagram

Instantly resize any video to the perfect Instagram dimensions — Reels, Stories, and Feed — directly in your browser. Free, private, no upload required.

Resize Instagram Video Free →Free · No signup · No upload

Getting your video into the right format for Instagram can be frustrating. Instagram Reels and Stories require a 1080×1920 vertical video (9:16), while feed posts work best at 1080×1080 square or 1080×1350 portrait. Upload the wrong size and Instagram will crop, letterbox, or simply reject your file. Resizor lets you resize video for Instagram in seconds — right inside your browser, without installing any software or uploading your footage to a server.

Our browser-based video resizer uses the WebCodecs API for hardware-accelerated encoding, so even long 4K clips are processed quickly. Choose your target format, hit Export, and you'll have an Instagram-ready MP4 file ready to post. It's completely free, there are no watermarks, and your video never leaves your device.

How It Works

Upload Your Video

Drag and drop or click to select any video file from your device — MP4, MOV, WebM and more are all supported.

Choose Instagram Format

Pick Reels / Stories (1080×1920) or Feed (1080×1080). The tool sets the right dimensions automatically.

Download & Post

Click Export, wait a few seconds while your browser processes the video, then download and post directly to Instagram.

Why Choose Resizor?

🔒

100% Private

Your video never leaves your device. All processing happens inside your browser using WebCodecs.

⚡

Blazing Fast

Hardware-accelerated encoding in the browser means most videos are ready in seconds.

🆓

Always Free

No subscription, no watermark, no file-size cap. Resize as many Instagram videos as you need.

📐

Perfect Dimensions

Preset sizes for Reels (9:16), Feed square (1:1), and Landscape (16:9) so your content never gets cropped.

Frequently Asked Questions

What is the ideal video size for Instagram Reels?

Instagram Reels should be 1080×1920 pixels (9:16 aspect ratio). The maximum length is 90 seconds and the recommended file size is under 650 MB. Resizor outputs exactly 1080×1920 MP4 for Reels.

What size should an Instagram feed video be?

For a square feed post use 1080×1080 (1:1). For a portrait feed video use 1080×1350 (4:5). For a landscape feed video use 1920×1080 (16:9). Instagram will crop anything that doesn't match these ratios.

Does Instagram support WebM or MOV?

Instagram only accepts MP4 (H.264/AAC). Resizor exports your video as an H.264 MP4 file which is directly compatible with Instagram uploads.

Will Resizor add a watermark to my video?

No. Resizor is completely free and never adds watermarks to your output files.

Does my video get uploaded to a server?

No. Resizor runs entirely in your browser. Your video is never sent to any server, so your content stays completely private.

Resize Video for Instagram — Start Now

100% free, runs in your browser. No signup required.

Resize Instagram Video Free →