Why your exported video looks worse than the preview

In the editor, the video looks exactly right. You export it, open the file, and something is off: the image is softer, the dark areas are blocky, the colours are paler. Upload it to a social platform and it gets worse again.

This is common enough to have a handful of usual causes. Each leaves a recognisable signature, and most are fixable.

1. Compression: the export is smaller than the source

Signature: blocky patches in dark areas and smooth gradients (skies, walls), smearing during fast motion, fine texture such as grass or hair turning to mush.

A video editor previews from your original footage, or from high-quality intermediate frames. The export has to compress everything into a file of reasonable size, and compression discards detail — most visibly where the image is dark, moving fast or full of fine texture.

What to do:

• Export at the highest quality setting available, and let the file be large. You can always make a smaller copy later.
• Export at the resolution you edited in. Downscaling on export is fine; upscaling cannot add detail.
• HEVC gives better quality at the same file size than H.264, where the destination supports it.

2. The platform re-encodes it anyway

Signature: the exported file looks fine on your Mac, but the uploaded version is softer and blockier.

Every social and video platform re-compresses what you upload, to its own settings, to save bandwidth and storage. There is nothing you can do to stop it. What you can control is what it starts from.

What to do:

• Upload at the platform's recommended resolution and frame rate. A 4K upload to a platform that shows 1080p is sometimes treated better, sometimes not — test with your own content.
• Avoid very fine detail and fast camera motion in the most important shots, which suffer most from re-compression.
• Text and graphics should be large and bold. Thin lines and small text break up first.
• Check the platform's app or upload setting for "upload in high quality" — some default to data-saving uploads over mobile networks.

3. Colour: the preview and the file disagree

Signature: the export looks paler, greyer or slightly shifted in colour compared with the editor — but only in some players.

Video files carry tags describing how their colours should be interpreted. Different players, browsers and platforms interpret those tags differently, particularly for gamma — how bright the mid-tones should be. The result is that the same file can look correct in one app and washed out in another.

What to do:

• Compare in more than one player before changing anything. QuickTime, a browser and the destination platform itself.
• If it only looks wrong in one place, that player is usually the problem, not the file.
• Avoid correcting the colour to suit one player; you will make it wrong everywhere else.

HDR footage is a special case. Recent iPhones record HDR video by default. Viewed on an HDR screen it is bright and vivid; converted to standard dynamic range for export or by a platform, it can look flat or oddly toned. If you are not deliberately producing HDR, consider turning HDR recording off in the Camera settings for footage you plan to edit.

4. Scaling: something was resized twice

Signature: a general softness, as if slightly out of focus, most visible on text.

Every time a video is resized, it loses a little sharpness. If a 4K clip is placed on a 1080p timeline, then exported at 4K, it has been scaled down and back up. If a portrait phone clip is placed in a landscape frame and zoomed to fill, it has been enlarged beyond its original resolution.

What to do:

• Set the project format and resolution before you start editing, matching the destination.
• Avoid zooming in on footage by more than a little. A 4K source can be cropped to 1080p without loss; a 1080p source cannot.

5. Frame rate mismatch

Signature: stuttering or judder on smooth motion, especially pans.

Mixing 24, 25, 30 and 60 frames-per-second clips in one project means some must be converted. The conversion repeats or drops frames, which shows as irregular motion.

What to do: keep footage at a consistent frame rate where possible, and export at the frame rate most of your footage uses.

Diagnosing in two minutes

1. Open the exported file in QuickTime, full screen, at the same size as the editor preview. If it looks fine, the problem is the platform (cause 2) or a specific player (cause 3).
2. If blocky: compression (cause 1). Raise quality.
3. If soft everywhere: scaling (cause 4). Check project resolution.
4. If paler: colour interpretation (cause 3). Check in other players.
5. If jerky: frame rate (cause 5).

What Garfi does

Garfi Video Editor is a native Mac editor that exports MOV or MP4 in H.264 or HEVC, up to 4K when supported, without a watermark. Choosing the canvas format — landscape, portrait, square or 4:5 — before you edit avoids the double-scaling problem, and crop, fit and fill control how each clip sits in the frame so you can see when a clip is being enlarged.

Projects are saved as portable .gvideo packages, so an export can be redone at a different setting without rebuilding the edit.

The download is free with an export trial you start yourself; a one-time purchase unlocks export permanently. Editing and saving projects remain available either way. There is no account, developer cloud or generative AI.