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Resize Video for Instagram Reels Free — 9:16 Format | MiOffice

Name: JSVV SOLS LLC
Address: 4100 Lafayette Center Dr #111, Chantilly, VA, 20151, US
Price range: Free

Resize videos to Instagram Reels dimensions (1080x1920, 9:16) free online. No watermark, processed in your browser.

Published March 23, 2026Updated October 30, 20261,500 words

Access and pricing

Supported tools include 5 free on-device uses per day, shared across eligible tools. On compatible devices, guest access needs no sign-in. Signed-in users also get 5 daily eligible on-device uses. AI and cloud processing use credits separately.

New accounts can claim 20 welcome credits once. Eligible offers in MiOffice can earn up to 80 reward credits; offer conditions apply.

Starter costs $6.99/month and includes 250 credits at each paid renewal plus unlimited eligible local processing. Unused credits roll over. The $2.99 Day Pass covers 24 hours of eligible local processing; AI and cloud credits are separate.

Compare tools using a representative file and inspect the export. Check supported formats, device compatibility, processing location and the displayed cost before starting. This article is published by MiOffice; consider its recommendations with that affiliation in mind.

Pricing

Access and pricing updated October 30, 2026. This editorial update does not indicate a new test run.

Instagram Reels is a full-screen vertical video format — 9:16 aspect ratio, same as TikTok. If you have a horizontal video, a square video, or footage at a non-standard aspect ratio, you need to resize it before uploading to Reels. Otherwise, Instagram crops it unpredictably or adds ugly black bars.

MiOffice resizes your video to 1080x1920 (9:16) for Instagram Reels directly in your browser using FFmpeg WebAssembly. Choose crop, pad, or fit mode. No file upload, no watermarks, no account.

Your video stays on your device — nothing is sent to any server.

Instagram Reels Video Specifications

Specification	Requirement
Resolution	1080 x 1920 px (recommended)
Aspect ratio	9:16 (vertical, full screen)
Duration	Up to 90 seconds
Max file size	650 MB
Format	MP4 (H.264 codec)
Frame rate	30 fps (recommended)
Bitrate	3.5 – 5 Mbps (recommended)

How to Resize Video for Instagram Reels

1
Open the Reels Video Resizer
Go to the Instagram Reels video resizer. FFmpeg WebAssembly loads in your browser automatically — no install needed.
2
Upload Your Video
Drag and drop your video file (MP4, MOV, WebM, AVI). The file loads into browser memory only — no server upload. You will see a preview with the original dimensions displayed.
3
Select Resize Mode
Crop fills the 9:16 frame by cutting the sides of horizontal footage. Pad/Fit places the video centered in a 9:16 frame with blurred or colored bars. Stretch fills without cropping but distorts the image. Crop is best for most content.
4
Download and Upload to Instagram
FFmpeg encodes the resized video as H.264 MP4. Download the result — no watermarks. Transfer to your phone if needed and upload directly to Instagram Reels.

Instagram Reels Best Practices

Keep It Under 30 Seconds

While Reels supports up to 90 seconds, Instagram's algorithm tends to favor shorter content. Videos between 15-30 seconds get more replays (counted as additional views) and higher completion rates, both of which boost reach.

Choose Your Cover Frame Carefully

The cover frame appears as a roughly 4:5 crop on your profile grid. Choose a visually striking frame where the subject is centered. Add text overlay to the cover frame to tell viewers what the Reel is about before they tap.

Mind the Safe Zones

Instagram overlays the like/comment/share buttons on the right side, and the caption text at the bottom. Keep important content (faces, text, products) in the center 80% of the frame to avoid being obscured by UI elements.

Do Not Cross-Post with TikTok Watermarks

Instagram's algorithm deprioritizes Reels that have visible TikTok watermarks. If you are repurposing TikTok content, resize the original source video directly rather than downloading from TikTok (which adds their watermark).

Converting Horizontal Video to Vertical

The most common resize scenario is converting 16:9 horizontal footage to 9:16 vertical. Here is what each mode does to a standard 1920x1080 video:

Crop mode takes a 607-pixel-wide vertical strip from the center of your 1920-pixel-wide frame and scales it to 1080x1920. You keep about 32% of the original width. This works well when the subject is centered but loses content on the sides.

Pad/Fit mode scales the entire 1920x1080 frame down to fit within the 1080-pixel width, resulting in a smaller video (1080x607) centered in the 1920-pixel-tall frame. The remaining space above and below is filled with blurred content or a solid color. All content is preserved but appears smaller.

For talking-head videos, product demos, and interviews where the subject is centered, crop mode produces the most engaging Reels. For landscape footage, tutorials, or screen recordings where all content matters, pad/fit preserves everything.

Resize for Other Short-Video Platforms

All three major short-video platforms use the same 9:16 aspect ratio, but they have different duration limits and best practices:

• Resize video for TikTok — Up to 10 minutes, 287 MB mobile limit, different UI safe zones
• Resize video for YouTube Shorts — 60-second maximum, searchable via YouTube, evergreen discoverability

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Frequently Asked Questions

What are the exact dimensions for Instagram Reels?

Instagram Reels uses 1080x1920 pixels in 9:16 aspect ratio. This is the same as TikTok and YouTube Shorts. Instagram also supports 1:1 (square) and 4:5 (portrait) in the regular feed, but Reels specifically uses full-screen 9:16 vertical.

What is the maximum length for Instagram Reels?

Instagram Reels can be up to 90 seconds long. Videos longer than 90 seconds cannot be posted as Reels — they go to the regular video feed instead. For maximum reach, Instagram recommends Reels between 15 and 30 seconds.

Does Instagram re-compress my video?

Yes. Instagram re-encodes all uploaded videos regardless of quality. Uploading a 1080x1920 video at 30 fps with a bitrate of 3.5-5 Mbps gives Instagram the best source to work with. Uploading at lower quality results in more visible compression artifacts after Instagram processes it.

Can I use the same video for Reels and TikTok?

Yes, both use 1080x1920 at 9:16. The main difference is duration (Reels: 90 sec max, TikTok: 10 min max) and safe zones for UI overlays. If your video is under 90 seconds, the same file works on both platforms. Avoid visible TikTok watermarks when cross-posting — Instagram deprioritizes content with competitor watermarks.

How do I choose a good cover frame for my Reel?

Instagram lets you select a cover frame after uploading. Choose a frame where the subject is clearly visible, centered, and visually interesting. The cover shows as a cropped thumbnail (roughly 4:5) in your profile grid, so faces and key elements should be in the center vertical strip.

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