Compress Video & Photo—ByteKit

A target size in megabytes, not a quality percentage. Compare a real encoded frame before anything is written. 15 tools for video, photo and audio, all on device.

ByteKit compresses, converts and trims video, photo and audio on your iPhone or iPad. It reads the source file, works out the settings needed for the size you asked for, encodes with the device's hardware encoder, measures the result, and encodes again if the file came out over target. Nothing is uploaded.

• A target size in megabytes rather than a quality percentage; the bitrate is derived from it • A side-by-side comparison of a frame encoded at your settings, shown before anything is written to disk • Six presets, each applying one binding limit: file size, resolution or length • Trimming and rotation that do not re-encode at all • Batch processing, with finished files kept if a job is interrupted • No account, no servers, no analytics, no advertising

FREE

Every tool, no watermark, no export limit, three video conversions a day.

PRO

No daily limit. Batch processing, target size mode, the presets, and the output quality setting.

Available as a yearly subscription with a free trial, or a one-time lifetime purchase.

TARGET SIZE

Ask for a size and the app works backwards from it. Container overhead and the audio share are subtracted, the video bitrate is derived from what is left, and the encoded file is measured. If it came out over target, it is encoded again closer to the number.

Resolution is never lowered, so below a certain point a file cannot get smaller. The slider stops there and says why, instead of failing later.

COMPARISON

A sample of the source is encoded at your current settings and shown next to the original frame, with a divider you can drag. It is a real encode, not a preview filter, so the artefacts you see are the artefacts you get. The same comparison is shown afterwards on the finished file.

PRESETS

Six presets, each carrying one limit that binds: 16 MB and 20 MB for sharing and mail attachments, 1080p and 4K for resolution, three minutes for length, and a two-gigabyte ceiling. The tile shows whichever limit applies. If a preset would shorten the clip, it says so before the job starts rather than trimming quietly.

VIDEO

Compress to a target size. Convert between MP4 and MOV, H.264 and HEVC. Trim losslessly, aligned to the nearest keyframe. Join clips end to end. Rotate by 90°, written as metadata with no pixel re-encoded. Change speed from 0.5× to 4×. Remove the audio track without touching the picture. Make a GIF with no duration limit. Grab a still frame.

PHOTO

Compress to a target size, resize by long edge, convert between HEIC, JPG and PNG. EXIF orientation is applied to the pixels, so a rotated photo does not come out sideways.

AUDIO

Extract audio as M4A, WAV, AIFF or CAF, from an audio file or from a video. Make a ringtone in M4R. There is no MP3 output: iOS provides no MP3 encoder, and M4A gives better sound at the same size.

BATCH AND QUEUE

Files are processed one after another. Finished files are kept if you cancel or the app closes, and the queue picks up where it stopped.

AUTOMATION

Shortcuts actions on iPhone, iPad and Mac. On iPhone and iPad a job can also be started from the share sheet or from a Control Center control.

SUBSCRIPTION

Subscriptions renew automatically unless cancelled at least 24 hours before the end of the period. Payment is charged to your Apple Account. Manage or cancel in Settings.

PRIVACY

Files are not uploaded. The app does not read your photo library; it receives only the items you select in the system picker, and asks for photo permission only to save finished files back. Settings sync through iCloud; media, history and outputs do not.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://common-tuna-240.notion.site/ByteKit-Privacy-Policy-3d2e3b91ac008064a7bceec0055668c5