PerfectStudio / Guides / Convert to TikTok 9:16

How to convert any video to TikTok 9:16

Q: What aspect ratio does TikTok actually want?

9:16, full-vertical. Spec is 1080×1920 at 30 or 60 fps, H.264 / AAC inside MP4. TikTok will accept horizontal video and letterbox it for you, but the feed treats vertical posts very differently from letterboxed ones — anything not actually 9:16 reads as 'imported from somewhere else' and the algorithm de-prioritises it.

Q: Crop, blur-fill, or letterbox — which one should I pick?

Crop if the subject is centred and there's nothing important on the left/right edges. Blur-fill if you can't lose the original framing but want the screen filled (most TikTok-native look). Letterbox if you want to preserve the original frame exactly as a creator-style 'this was shot horizontal' aesthetic.

Q: Does this work on Reels and YouTube Shorts too?

Yes — all three platforms use 9:16 1080×1920 as their target. One conversion uploads to all of them. The differences are platform-side (length cap, thumbnail handling), not file-spec.

Q: Will the audio be re-encoded?

Audio is re-encoded to AAC 192 kbps to match TikTok's standard. The original is left untouched. If your source audio is already AAC at a reasonable bitrate, you can pick 'copy audio' under the advanced output panel.

One drop, three framing options, ninety seconds. Free tier handles it.

By Adam Lankamer · Updated 2026-06-01 · 3 min read

TL;DR

Drop your video into PerfectStudio's Aspect mode, pick the 9:16 vertical preset, choose Crop / Blur Fill / Letterbox, set output to 1080×1920, click Convert. Works on TikTok, Reels, and YouTube Shorts — same spec across all three. Free tier ships every aspect-ratio preset; outputs carry a centred watermark you can remove with Pro ($59 one-time).

What you'll need

PerfectStudio installed (Mac arm64 + Intel, or Windows)
A source video — any common format (MP4, MOV, AVI, MKV, WebM, ProRes, DNxHR)
About 3 minutes per 1-minute clip on modern hardware

The six steps

Open PerfectStudio, pick Aspect mode

Launch the app. From the mode tabs at the top, pick Aspect. That's the aspect-ratio conversion workspace — separate from the GIF chunker, frame extractor, and slow-motion modes.

Drop your source video

Drag the file onto the drop zone, or click to browse. Any common video container works — MP4, MOV, AVI, MKV, WebM. Studio tier adds ProRes and DNxHR input support.

Pick the 9:16 vertical preset

From the aspect-ratio picker, choose 9:16 (vertical). This is the same spec TikTok, Instagram Reels, and YouTube Shorts all use — one conversion covers all three platforms.

Choose a framing strategy

Crop keeps the subject centred and trims the left/right edges — pick this when the action is in the middle. Blur Fill extends the sides with a colour-matched blur of the frame itself — feels TikTok-native. Letterbox adds black bars top and bottom, keeping the original frame untouched — the "shot horizontal" aesthetic.

Set output to 1080×1920

TikTok serves the feed at 720p but accepts up to 1080×1920. 1080p is the sweet spot — higher resolutions get downsampled platform-side anyway. Keep H.264 / AAC inside MP4 (the defaults).

Click Convert

The bundled FFmpeg pipeline encodes with web-friendly fast-start so the file streams instantly on upload. Output saves next to your source by default; change the destination in Settings if you want a dedicated folder. Studio tier batches dozens of files in one queue.

Gotchas worth knowing

Title-safe area — TikTok overlays the username, caption, and right-side icons on the bottom 20% and right 10%. Frame the subject toward the upper-middle so platform UI doesn't sit on their face.
Frame rate — match the source. 24 fps → 24 fps, 30 → 30, 60 → 60. Don't re-time unless you mean to.
Already vertical? PerfectStudio detects 9:16 input and asks whether to re-encode or skip. Skip is the right call if your source is already 1080×1920 H.264.
Audio — re-encoded to AAC 192 kbps by default to match TikTok's standard. If your source audio is already AAC at a reasonable bitrate, the advanced output panel lets you pick "copy audio" to skip the re-encode entirely.
File size — 1080p H.264 at 30 fps lands around 8 MB per 10 seconds, well under TikTok's per-upload size cap for normal clip lengths. The platform's exact cap shifts over time and differs between the mobile and web uploaders, so if you're pushing very long files check the current TikTok upload help for the latest number.

Pricing in context

The aspect-ratio conversion is fully usable in the free tier. Watermark on the output is the only catch.

Free — every preset, every framing strategy, every output resolution. Centred watermark on the output.
$59 Pro (one-time) — removes the watermark. Single-file across all four PerfectStudio modes.
$129 Studio (one-time) — unlocks the batch queue. Drop a folder of 200 clips, pick the 9:16 preset once, walk away.

If you're producing for TikTok / Reels / Shorts more than a few times a month, Studio pays for itself the first time you'd otherwise have queued a hundred files one at a time.

Frequently asked

What aspect ratio does TikTok actually want?

9:16 full-vertical. Spec is 1080×1920 at 30 or 60 fps, H.264 / AAC inside MP4. TikTok accepts horizontal video and will letterbox it for you, but the feed treats vertical-native posts very differently — anything non-9:16 reads as "imported from elsewhere" and gets less algorithmic lift.

Crop, blur-fill, or letterbox — which one should I pick?

Crop when the subject is centred and there's nothing critical on the left/right edges. Blur-fill when you can't lose the original framing but want the screen filled — most TikTok-native look. Letterbox when you want to preserve the original frame exactly with the "shot horizontal" aesthetic.

Does this work on Reels and YouTube Shorts too?

Yes — all three platforms use 9:16 1080×1920. One conversion uploads to all of them. The differences are platform-side (length cap, thumbnail behaviour), not file-spec.

Will the audio be re-encoded?

By default, yes — AAC 192 kbps to match TikTok's standard. The advanced output panel lets you pick "copy audio" if your source audio is already AAC at a reasonable bitrate.

Can I batch-convert dozens of clips at once?

Yes — Studio tier ($129 one-time) unlocks the batch queue. Drop a folder, pick the preset once, walk away. Pro tier ($59) handles one file at a time across all four modes. Free tier handles one file at a time with a watermark.

What if my source is already vertical?

PerfectStudio detects vertical input and asks whether to re-encode (for spec normalisation — useful if your source is 4K vertical and you want 1080p out) or skip. If your source is already 1080×1920 H.264, skip is the right call — nothing to do.

Other guides

Convert to TikTok 9:16 Extract frames from video Free Twixtor alternative Batch convert MOV to MP4

Comparing tools instead? See the PerfectStudio comparison hub — vs ezgif, HandBrake, Twixtor, CloudConvert, Adobe Media Encoder, FFmpeg, Photoshop Batch, Topaz Video AI, DaVinci Resolve.