Convert Video for Twitter (X)

About Convert Video for Twitter (X)

Our Free Online Convert Video for Twitter (X) tool re-encodes any clip into a file that X will accept on the first try: an MP4 with H.264 High profile video and AAC-LC audio, sized to an approved frame, capped at 30 or 60 frames per second and trimmed to the 2 minute 20 second limit. Everything runs inside your browser with FFmpeg.wasm, so your footage is never uploaded to a server.

Twitter (X) Video Requirements at a Glance

Features:

• Client-Side Processing: Converts your clip with FFmpeg.wasm inside the browser tab. Your files stay private.
• Always X-Compliant Output: MP4 container, H.264 High profile video, yuv420p pixel format, 128 kbps AAC stereo audio — the exact combination the X uploader looks for.
• Timeline Shapes: Landscape 16:9, Portrait 9:16, Square 1:1, Vertical 4:5, or keep the original shape.
• 720p Free, 1080p with Pro: 720p is what X serves to most viewers and is free for every shape. 1080p matches what an X Premium account can post.
• Crop or Letterbox: Fill the frame and cut the edges, or fit the whole picture and pad with black bars.
• Automatic Trim: Cuts the clip to the 2 minute 20 second limit a standard account can post, from a start point you choose. Keeping the full length is a Pro option, since only X Premium accounts can upload it.
• Frame Rate Cap: Locks output to 30 or 60 fps so high-frame-rate phone footage stops being rejected.
• Live Compatibility Check: A table shows your source file against every X limit, then re-checks the converted result.
• Faststart: The MP4 index is written to the front of the file so X can start processing it immediately.
• Dual Preview: Watch the original and the converted version side by side before downloading.
• Progress Tracking: Follow the conversion with a real-time progress bar.

Who Will Benefit?

• Social media managers: Turn a client's master file into a timeline-ready post without opening an editor.
• Content creators: Reframe a landscape YouTube clip as 9:16 or 1:1 for a scrolling feed.
• Marketers: Get an ad cut under the 140-second limit and inside the 512 MB ceiling.
• Gamers and streamers: Convert a 120 fps capture down to the 60 fps X will actually accept.
• Anyone whose upload failed: Re-encode a MKV, WEBM, HEVC or 5.1-audio file into something X reads.

How to Use:

1. Load Engine: Wait for the video engine (FFmpeg) to load; a progress bar shows the status.
2. Upload Video: Drag and drop your file onto the upload area, or click "Select Video" to browse.
3. Read the Check: The "X Compatibility Check" table appears, marking every limit your source file passes or fails.
4. Pick a Frame Shape: Choose a shape from "Frame shape for X", or "Keep original shape" to change only the codec.
5. Pick a Resolution: 720p is free for every shape; 1080p is a Pro option.
6. Choose Crop or Fit: Select "Crop to fill" to keep the frame full, or "Fit with black bars" to keep the whole picture.
7. Set Quality and Frame Rate: Pick a quality tier and 30 or 60 fps.
8. Trim if Needed: Clips longer than 2:20 show a trim control. Leave it ticked and set a start time to pick which section to post.
9. Convert: Click "Convert for Twitter (X)" and watch the progress bar.
10. Download: Preview the result, confirm the check rows are green and click "Download X-Ready MP4".

Note: Processing happens entirely in your browser, so long or high-resolution clips take longer and use more memory. If a very large file fails, trim it first with the Video Splitter or shrink it with the Video Compressor, then convert.

Quick Answer

To convert a video for Twitter (X), upload it here, choose a frame shape such as Landscape 16:9 at 720p, leave Trim to Twitter's 2:20 limit ticked if the clip runs long, click Convert for Twitter (X) and download the MP4. The output is always MP4 with H.264 High profile video and AAC-LC audio, which is the only combination X reliably accepts, capped at 30 or 60 fps and 140 seconds. Everything runs in your browser with FFmpeg.wasm: no upload, no watermark, no account.

Common Use Cases

Fixing a rejected upload

MKV, WEBM, AVI, HEVC and VP9 files all play fine locally and all fail on X. Re-encoding to MP4 with H.264 and AAC is usually the entire fix.

Cutting a long clip to 140 seconds

A standard account stops at 2 minutes 20 seconds. Setting a start time lets you post the section that matters instead of just the opening.

Reframing landscape footage for a phone feed

A 16:9 clip cropped to 9:16 or 1:1 occupies far more of a scrolling screen, which is why vertical and square posts tend to hold attention longer.

Getting under the 512 MB limit

Dropping to 1280×720 at the Smaller file quality setting typically cuts a bloated export to a fraction of its size with little visible difference on a phone.

Converting high-frame-rate captures

Game recordings and phone slow-motion at 120 or 240 fps exceed the 60 fps ceiling and are refused. Capping the frame rate makes them uploadable.

Removing 5.1 surround audio

Multichannel audio from a camera or a screen recorder is a silent cause of upload failure. The output here is always stereo AAC.

Frequently Asked Questions

What video format does Twitter (X) accept?

X accepts MP4 and MOV files. The video stream must be H.264 and the audio stream must be AAC-LC. Anything else, including WEBM, MKV, AVI, HEVC and VP9, is rejected by the uploader. This tool always writes MP4 with H.264 High profile video and 128 kbps AAC stereo audio, so the result is accepted regardless of what you started with.

How long can a Twitter (X) video be?

A standard account can post a video up to 2 minutes 20 seconds, which is 140 seconds. Paid X Premium tiers allow much longer uploads. The tool ticks Trim to Twitter's 2:20 limit automatically when your clip is longer, and you can set the start time so the trimmed section begins where you want.

What is the maximum file size for a video on X?

512 MB when posting from the web. Mobile apps are stricter in practice. If your file is over the limit, choose the Smaller file quality setting or a lower frame size such as 1280×720, both of which cut the bitrate substantially.

What aspect ratio works best on X?

16:9 landscape is the safe default and matches how most timeline video is shown. 1:1 square and 9:16 portrait take up more vertical space in a scrolling feed and generally hold attention longer on phones. X accepts anything between 1:2.39 and 2.39:1; outside that range the uploader refuses the file.

Is my video uploaded to a server?

No. FFmpeg compiled to WebAssembly runs inside your browser tab, so the file is read from your device, re-encoded on your own CPU and written straight back locally. Nothing is transmitted and nothing is stored.

Why did X reject my video even though it plays fine on my computer?

The most common causes are a container or codec X does not read (MKV, WEBM, HEVC, VP9), a clip longer than 2 minutes 20 seconds, an aspect ratio outside 1:2.39 to 2.39:1, a frame rate above 60 fps, or 5.1 surround audio. Re-encoding through this tool removes all of those causes at once.

Should I use 30 or 60 frames per second?

30 fps is what X recommends and it is the right choice for talking heads, screen recordings and most edited clips. Choose 60 fps for sport, gaming and anything with fast motion. 60 fps is also the hard ceiling, so footage recorded at 120 or 240 fps has to be converted down before it will upload. If you only want to change the frame rate and nothing else, the FPS Converter does that on its own.

Does converting reduce the quality of my video?

The clip is re-encoded once, so there is a small generation loss. It is far smaller than the loss X itself applies when it re-compresses an oversized upload, which is why sending a correctly sized file usually looks better on the timeline than sending the raw original.

What is the difference between Crop to fill and Fit with black bars?

Crop to fill scales the video until it covers the whole frame and cuts off whatever falls outside, so the picture stays full-bleed but the edges are lost. Fit with black bars scales the whole picture down until it fits and pads the empty space, so nothing is cut but the video occupies less of the frame. Crop is the better choice for reframing a landscape clip as portrait, provided the subject sits near the centre.

Why does the tool add a faststart flag?

The faststart flag moves the MP4 index to the front of the file so a player can begin playback before the whole file has been read. It makes uploads process faster and is standard practice for any video destined for a social feed.

Can I post the converted file anywhere else?

Yes. H.264 in an MP4 with AAC audio is the most widely supported combination there is, so the same file works on LinkedIn, Facebook, Instagram and almost any player.

Do I need Pro to use this tool?

No. Converting to a file a standard X account can post is free: every frame shape, 720p output, crop or letterbox, the frame-rate cap and the trim to 2 minutes 20 seconds. Pro covers the two things only an X Premium account can actually upload — 1080p output and keeping a clip longer than 2:20 — and raises the daily run limit.

Related Tools

• Video Compressor — Push the file further under the 512 MB ceiling.
• Video Splitter — Cut a long recording into several posts of 2:20 or less.
• Video Cropper — Choose the crop region by hand instead of centring it.
• FPS Converter — Change only the frame rate, leaving everything else alone.
• Video Bitrate Calculator — Work out the bitrate a given frame size and length needs.
• X (Twitter) Engagement Rate Calculator — Measure how the post performs once it is live.

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