Video compression
Video compression for iPhone.
4K clips are what fill iPhones. Re-encode them at a preset you choose, check the real file size, then decide what to do with the original.
Free forever No ads, no subscription Core cleanup runs on-device
Why iPhone videos get so large
Modern iPhones record at bitrates designed for large screens and for editing headroom, not for watching on a phone. Four things drive the size:
- Resolution. 4K carries four times the pixels of 1080p. A phone screen at normal viewing distance cannot show the difference on most footage.
- Frame rate. 60 fps roughly doubles the data of 30 fps, and it is only worth it for fast motion.
- HDR and Dolby Vision. High dynamic range adds metadata and bitrate to preserve highlights and shadows.
- ProRes and Log. Professional formats store far more data per frame because they are meant for grading, not for watching.
None of that is waste in the moment it is recorded. It becomes waste the moment the clip lands in a library where it will only ever be watched on a phone. Compression is the act of matching the file to how it will actually be used.
How compression works in TidyByte
- Select the clips. The list shows each video with its current size, so you can pick by cost rather than by name.
- Choose a preset. Each preset states what it does to resolution and quality, and the default never upscales a clip that is already smaller than the preset.
- Export on-device. Re-encoding happens locally with Apple’s media frameworks. Selected videos are not sent to TidyByte; iCloud-only clips may need to download first.
- Verify the result. The exported file is measured against the original. If it is not genuinely smaller, the app says so and keeps the original.
- Keep or remove the original. The compressed version is saved to your library first; deleting the original is a separate, optional step.
Batches run with per-file progress and can be cancelled. Videos that live only in iCloud are downloaded first, and if one cannot be fetched in time it is reported as skipped instead of hanging the queue.
Choosing a preset without guessing
Keep it sharp
For footage you might edit or show on a TV. Modest size reduction, no visible change on any screen.
Balanced
The usual choice. Clips stay crisp on a phone and in most social apps, and the file gets dramatically smaller.
Smallest
For clips you are keeping for the memory rather than the picture quality: long recordings, event coverage, anything archival.
Because every result is measured, you can compress one clip, look at the saved size, and decide whether to go further before running the whole batch. There is no credit system and no per-file charge, so experimenting costs nothing.
When not to compress a video
- You are going to edit it. Re-encoding before editing throws away detail you may want when you colour-grade or stabilise.
- It is already heavily compressed. Footage from messaging apps or social downloads has little left to give; the app skips these when the saving would not be real.
- It is the only copy of something irreplaceable. Back it up first, then compress the copy you keep on the phone.
For everything else — birthday clips, holidays, screen recordings, the video you took of a parking space — compression is the fastest way to keep the memory without keeping the bitrate.
How it compares
| TidyByte | iMovie export | Cloud video compressors | |
|---|---|---|---|
| Uploads videos to a TidyByte server | No, compression runs on-device | No | Yes |
| Batch multiple clips | Yes, with progress and cancel | One project at a time | Sometimes |
| Verifies the new file is smaller | Yes, before offering deletion | No | No |
| Keeps resolution options explicit | Presets listed by size and quality | Single export setting | Varies |
| Handles iCloud-only videos | Downloads first, reports size honestly | Downloads first | Downloads first |
| Cost | Free | Free | Paid plans, often per file |
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Free forever
No subscription, no in-app purchases, no ads.
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Private by design
No TidyByte account, backend, analytics SDK, ads, or tracking.
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On-device only
iPhone-library cleanup runs locally; optional Google Photos connects directly to Google.
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Open source
MIT licensed on GitHub, so every claim is auditable.
Frequently asked questions
How do I compress a video on my iPhone without losing quality?
Use a preset that matches how you will actually watch the clip. Dropping 4K to 1080p typically cuts a file to less than half its size while looking identical on a phone screen, and shorter travel or social clips survive aggressive presets well. TidyByte shows you the saved size per file, so you can stop at the first preset that still looks right.
Does compressing a video delete the original?
Not unless you tell it to. TidyByte exports the compressed version, compares the two file sizes, saves the new file to your library, and only then offers to remove the original. If the export happens to be larger, it says so and keeps the original untouched.
How much smaller will my videos get?
The answer depends on the source: 4K footage from a recent iPhone compresses the most because it carries far more detail than a phone screen needs. Lower-resolution clips that are already efficient compress far less. TidyByte reports the actual result for each file rather than promising a fixed percentage.
Can I compress several videos at once?
Yes. Select the clips, choose a preset, and the batch runs with per-file progress you can cancel. Finished items stay in the list with their before and after sizes, so you always know what happened to each video.
What happens with videos stored only in iCloud?
The app downloads the asset first, which takes time on a large file, and then compresses it locally. The video is not uploaded to TidyByte, and if it cannot be downloaded within the timeout, it is reported as skipped instead of hanging the batch.
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Shrink your biggest videos.
Download TidyByte Free, pick a preset, and watch a 4K clip turn into a fraction of its size.