Watch the exported file from start to finish
Preview the actual export, not only the editing timeline. A timeline can look correct while the rendered file has a frozen opening frame, a missing ending, or a black gap after the last cut. Watch the whole clip once with sound and once while checking the on-screen text.
Check the beginning and end carefully. Those are common places for a slate, accidental blank frame, or a cut that trims the first word. If you made a vertical edit, look at it on a phone-sized screen too; details that are clear on a large monitor may be hard to read on a small display.
Check speech, music, and captions together
Listen for abrupt volume jumps, clipped speech, background noise, and music that masks a voice. If the piece includes licensed audio, confirm that the license covers your intended platform and use. A file that plays properly does not prove that every included song or sound is cleared for reuse.
Read captions against the audio and correct names, numbers, punctuation, and timing. Keep a separate transcript or subtitle file when you may need to edit or translate the captions later. Do not rely on color alone to distinguish speakers or mark important information.
Confirm orientation and framing
Make sure the export has the intended portrait, square, or landscape shape. Check that faces, product details, and text are not covered by the app controls or cropped at the edges. Leave comfortable space around titles and subtitles because different players place buttons and captions in different areas.
If the clip is meant to loop, inspect the transition from the last frame back to the first. A hard jump can distract viewers even when every individual shot looks good.
Check the file itself
Confirm that the filename has the expected extension and that the file size is plausible for its duration and resolution. An extension alone does not prove the encoding is valid. Play the file in a second trusted player if the first app reports an error or shows no audio.
Keep a copy of the original export before you run it through another converter. Repeated lossy encoding can soften detail and introduce audio artifacts. If a recipient needs a different format, make that version from the original project or highest-quality source you are authorized to use.
Review what the clip communicates
Check names, dates, prices, and claims against the source material. Remove private information that should not be public, and confirm that people shown in the video have agreed to the intended use. If the footage belongs to another creator, get permission and keep the credit with the file.