How to Prepare Videos for Upload
A pre-upload checklist for creators: correct aspect ratio, resolution, format, file size, audio, and a thumbnail, so your video looks its best.
The minutes before you hit upload decide a lot about how your video performs. A clip that is the right shape, format, and size, with clean audio and a strong cover, looks professional and avoids platform headaches.
This is a practical pre-upload checklist for videos you own, using free in-browser tools.
1. Match the aspect ratio
Confirm the shape fits the placement: 9:16 for Reels, TikTok, Shorts, and Stories; 4:5 or 1:1 for feed; 16:9 for standard YouTube. Resize with the Video Resizer if needed. See the aspect ratio guide.
2. Set the right resolution
1080 × 1920 covers most vertical formats. Avoid uploading unnecessarily huge resolutions, platforms re-compress anyway, and large files upload slowly.
3. Use a compatible format
Export MP4 with H.264 video and AAC audio. It is the most reliable across platforms. If you have a MOV, see MP4 vs. MOV.
4. Check file size and audio
Make sure the file is within the platform's limits, compress with the Video Compressor if it is too big. Listen back for clipping or low volume, since many viewers watch with sound.
5. Prepare a thumbnail and verify
Grab a strong cover frame with the Thumbnail Extractor, then do a final check in the Metadata Checker to confirm resolution, format, and size before uploading.
Common mistakes that hurt uploads
A few avoidable habits cause most upload disappointments:
- Re-exporting an already-compressed clip: every extra pass softens detail. Always go back to your clean master, not a downloaded or shared copy.
- Letting the platform crop for you: if the shape is wrong, the app may zoom in and cut off heads or captions. Resize first.
- Burning captions into the unsafe zone: text near the very bottom or top can sit behind platform buttons and the username. Keep important text in the central area.
- Ignoring audio levels: a clip that is too quiet gets skipped. Aim for clear, consistent loudness.
Mind the safe zones for text and faces
Short-form apps overlay your video with interface elements: the caption and handle along the bottom left, and the like, comment, and share buttons down the right side. Anything important you place in those areas can be hidden. Keep faces, key action, and on-screen text within the central column and away from the bottom 15 percent or so of the frame. Previewing in the app before publishing, or simply visualizing those overlays, catches problems early. If you need to recompose the frame, the Freeform Crop tool lets you shift the important content into a safer position.
A final pre-publish checklist
Run through this in order right before you post:
- Aspect ratio matches the placement.
- Resolution is 1080 wide on the short side, not larger than needed.
- Format is MP4 with H.264 video and AAC audio.
- File size is under the platform limit.
- Audio is clear and at a consistent level.
- Captions and faces sit inside the safe zone.
- A strong cover frame is ready.
- Metadata is verified one last time.
For why this matters even after a clean export, see why your video loses quality after upload.
Platform-specific quirks to plan for
The general checklist gets you most of the way, but each platform has its own habits worth knowing. Instagram favors a 4:5 portrait in the main feed and full 9:16 for Reels and Stories, so a single square clip will not look ideal everywhere. TikTok leans fully vertical and rewards clips that hook in the first second, since the caption and buttons crowd the lower right. YouTube Shorts also wants 9:16 but sits inside an app that still serves landscape video, so keep your Short clearly vertical to avoid being padded. WhatsApp and other messaging apps compress hard, so if you are sharing rather than publishing, expect a softer result and send the smallest acceptable file. Knowing these tendencies before you export means fewer surprises after you post, and less re-uploading to fix something you could have set correctly the first time.
Frequently asked questions
What should I check before uploading a video?
Aspect ratio, resolution, format, file size, audio quality, and a thumbnail. Matching these to the platform avoids cropping, slow uploads, and rejected files.
What format should I upload?
MP4 with H.264 video and AAC audio is the most compatible across platforms.
What resolution should I use?
1080 × 1920 for vertical formats. Higher resolutions add size without visible benefit since platforms re-compress uploads.
Should I compress before uploading?
If the file exceeds the platform's limit, compress once to a sensible size. Otherwise, a clean high-quality file is fine.
Do I need a custom thumbnail?
It helps. A clear, bright cover frame improves click-through. You can extract one directly from your video.
Why does my video get cropped when I upload it?
The clip's shape does not match the placement, so the app crops or zooms to fit. Resize to the correct aspect ratio before uploading so you control exactly what stays in frame.
Where should I place captions so they are not hidden?
Keep on-screen text in the central area of the frame, away from the bottom 15 percent and the right edge, where the platform places the caption, handle, and action buttons.
Is it better to upload over Wi-Fi or mobile data?
A strong, stable connection is what matters most. Some apps reduce upload quality on weak networks, so a solid Wi-Fi or strong data signal helps your file arrive intact.