How to Export After Effects with a Transparent Background

The short answer

To export from After Effects without a background, the empty areas of your composition must stay empty, and the export must use a format that can store an alpha channel. The alpha channel is a fourth channel that records transparency for each pixel. In the Output Module, choose a format and codec that support alpha, such as QuickTime with Apple ProRes 4444 or a PNG image sequence. Then set Channels to RGB + Alpha. Common delivery formats such as H.264 in an MP4 file do not store alpha. If you export to one of those, the transparent areas will be filled with a solid color, usually black.

About the evidence: no version-specific documentation was supplied for this guide. The steps below describe the general After Effects workflow. Menu labels and the list of available codecs can change between releases and operating systems, so check the exact names in your own installed version.

Before you render: make sure the composition is actually transparent

• Remove or turn off any solid, shape or footage layer that fills the whole frame and acts as a background.
• Click the Toggle Transparency Grid button at the bottom of the Composition panel. Transparent areas show as a checkerboard instead of the composition background color.
• The background color in Composition Settings only appears in the preview. It is not rendered when you export with an alpha channel, so you do not need to change it.
• If you removed a background by keying, check the edges against the checkerboard. Leftover color fringes will be exported along with the transparency.

Steps to render with a transparent background

• 1. Select the composition in the Project panel or make its timeline active.
• 2. Choose Composition > Add to Render Queue.
• 3. In the Render Queue, click the blue text next to Output Module to open its settings.
• 4. Set Format to an alpha-capable option, for example QuickTime or PNG Sequence.
• 5. For QuickTime, open Format Options and choose a codec that carries alpha, such as Apple ProRes 4444. Codecs like Animation or GoPro CineForm RGB 12-bit with alpha may also appear, depending on your version and system.
• 6. Under Video Output, set Channels to RGB + Alpha.
• 7. Set Color to Straight (Unmatted) or Premultiplied (Matted) based on what the receiving application expects. Straight is a common choice for compositing in another editor.
• 8. Click OK, set the Output To location and file name, then click Render.

If you queue the composition in Adobe Media Encoder instead, the same rule holds: pick a preset or format that supports alpha and confirm that alpha is enabled in the export settings. Media Encoder's built-in H.264 presets do not keep transparency.

Choosing a format

Format | Keeps alpha | Carries audio | Typical use

QuickTime with ProRes 4444 | Yes | Yes | Editing in Premiere Pro, Final Cut Pro or other NLEs

QuickTime with Animation or CineForm (if available) | Yes | Yes | Lossless or high-quality intermediates

PNG sequence | Yes | No | Frame-accurate overlays and broad compatibility

TIFF or OpenEXR sequence | Yes | No | High-bit-depth compositing pipelines

H.264 / MP4 | No | Yes | Final delivery where transparency is not needed

Files with alpha are usually much larger than compressed delivery files. Expect large output for long compositions, especially with image sequences or 4444-class codecs. This guide has no measured file sizes to quote.

What this means for any voice or audio in the composition

Image sequences such as PNG, TIFF and EXR contain only frames. Any narration, speech or other audio in the composition will not be exported with them. To keep the audio, render it separately: add a second Output Module to the same Render Queue item, and set it to an audio-only format such as WAV or AIFF. Alternatively, choose a QuickTime codec with alpha and enable Audio Output in the same Output Module, which keeps picture and sound in one file. Either way, check that the audio output setting is actually turned on, because After Effects can leave it off when there is no audio in the composition.

How to confirm the export worked

• Import the rendered file back into After Effects or into your editing program.
• Place it above another layer, or turn on the transparency grid. The background should show through wherever the composition was empty.
• If the background appears solid black or white, the format, codec or Channels setting did not include alpha. Check those settings and render again.
• If you rendered audio, play the file or the separate audio track to confirm that speech is present and stays in sync.

Common reasons transparency is lost

• Exporting to H.264, MP4 or another format that cannot store alpha.
• Leaving Channels set to RGB instead of RGB + Alpha.
• A full-frame layer, adjustment effect or solid still covering the background.
• The receiving application ignoring alpha, or reading straight alpha as premultiplied. This can produce dark or light halos around edges, which can be fixed by changing the alpha interpretation on import.