How to Compress AI Video for TikTok, YouTube and the Web
Make a delivery copy that fits its destination while protecting the details that compression can damage.
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Keep a master before making a smaller copy
Save the best original render before compressing it. Exporting a delivery copy lets you reduce dimensions, bitrate or duration without losing the source you may need for a revision. Do not repeatedly re-encode an already compressed copy when the master is available.
Begin with the destination and the actual picture. A dark atmospheric shot, small interface labels and fast motion can need different bitrate choices. File size alone does not show whether the face, captions or gradients survived.
Practical starting points
| Destination | Frame / format | Frame rate | Starting point and check |
|---|---|---|---|
| TikTok / portrait social | 9:16, often 1080 × 1920; H.264 MP4 is a practical starting format. | Match a supported source rate; check the specific upload route. | Keep faces and captions clear of interface overlays. Check the account’s current upload limits. |
| YouTube landscape, SDR | 16:9, 1920 × 1080; MP4 with a supported audio codec. | YouTube recommends the same rate as the recording. | Official guidance lists 8 Mbps for 1080p at 24/25/30 FPS and 12 Mbps at 48/50/60 FPS. |
| YouTube portrait | 9:16 when the story is portrait; avoid stretching landscape footage. | Match the source and review current Shorts eligibility. | Reframe deliberately. Short duration alone does not determine every publishing or rights rule. |
| Website preview | A size and ratio that fit the actual page; MP4 and optionally WebM for compatible browsers. | Avoid generating extra frames just to increase the number. | Try a smaller delivery size, inspect mobile playback and use a poster image. A decorative loop should not block reading or user controls. |
Separate recommendations from platform limits
The YouTube encoding guide recommends MP4, progressive video, a matching source frame rate and published bitrate ranges. Those are upload recommendations, not a requirement that every short clip use exactly that bitrate. For Shorts classification, use YouTube’s current Shorts guidance.
TikTok’s Content Posting API media guide lists MP4, WebM and MOV, recommends H.264, and describes a 23–60 FPS range and a 4 GB size ceiling for that API route. These API specifications should not be presented as one universal limit for every TikTok app, account or advertising format. Check the route you are actually using.
Estimate a size budget
A rough decimal estimate is: file size in MB ≈ total bitrate in Mbps × duration in seconds ÷ 8. An eight-megabit, 15-second video is about 15 MB before accounting precisely for audio and container overhead. Reducing a clip from 30 seconds to 15 seconds can save more bytes than a small quality adjustment.
Lower resolution when the destination does not need the original pixel count, then adjust bitrate. Watch for blocky motion, banding in shadows, smeared hair and broken caption edges. If the interface text becomes unreadable, raise the quality or redesign the framing instead of accepting a smaller but unusable file.
Use the local browser tool for short clips
The Browser Video Compressor processes MP4 and WebM locally. It accepts up to 200 MB input and up to 60 seconds per export, offers a maximum output edge, frame fitting, approximate trim, audio removal and WAV extraction. Available video encoders depend on the browser. Keep the tab visible during its real-time export.
In our desktop-browser check, a roughly five-second, 1.08 MB MP4 became a 0.36 MB H.264/AAC copy using the smaller setting and a 720-pixel longest edge. A separate 22.97 MB portrait input was trimmed from about 24 seconds to an eight-second WebM of 0.32 MB. That second result includes shortening as well as re-encoding; neither result is a universal compression ratio.
Exports were downloaded and decoded, and a control tone was retained in MP4 and extracted WAV. These checks validate those samples, not every codec or device. Browser trim and frame timing are approximate. Use a dedicated editor for exact cuts, long videos, HDR or a strict delivery specification.
Inspect the final file
- Play the downloaded file, not only the source preview. Check the first and last frames and any loop boundary.
- Listen for missing sound, clipping and synchronization. Removing audio should remove its track; extracting WAV creates an uncompressed editing file and can increase size.
- Check actual dimensions, duration and bytes. A target size is an estimate, so leave margin under a hard upload ceiling.
- Review the clip at phone size and on the target page. Look at captions, faces, UI details and dark gradients.
- Keep the master and the delivery copy labeled so the smaller file does not replace the only high-quality version.
Frequently asked questions
Will a target size guarantee an upload limit?
No. The browser tool estimates a bitrate budget and shows the actual result. Check the downloaded size and leave margin.
Does changing 16:9 to 9:16 crop the picture?
The AI Craft Pad tool fits the whole picture with bars when needed. It does not automatically recompose or crop the subject.
Is WAV a smaller audio format?
No. The tool extracts uncompressed 16-bit PCM WAV for editing. It may be much larger than the compressed audio inside the source video.
Continue with a practical next step
Created by AI Craft Pad. Contact or report an issue. Check the current generator controls and review the output before use.