SizeCap

SizeCap: Compress Video to MB

Compress one video or a batch of up to 50 (SizeCap Pro) on iPhone and iPad. SizeCap works locally, checks each finished file's actual byte size, and only hands you results at or below the cap you chose.

What it does

• Compresses one video or up to 50 videos with SizeCap Pro selected together
• Uses a 10, 25, 50, or 100 MB cap, or a custom number you enter
• Explains common chat, email, form, and coursework use cases, and has presets for Email, Discord, WhatsApp, and Teams that fill in a cap, which you can still change
• Applies one cap to the whole batch and processes videos one at a time
• Lets you cancel an in-progress compression or batch
• Works out the bitrate from your cap, then checks the result's real bytes
• Tells you the smallest workable size when a cap is too small for the clip's length
• Imports from Photos, Files, or the iOS share sheet
• Uses HEVC with two-pass encoding by default (Automatic), or H.264 if you pick Compatibility First; HDR video always uses HEVC Main 10 and keeps its HDR color information
• Preserves separate audio tracks instead of flattening them into one
• Saves to Photos or hands the finished MP4 file to the share sheet
• Switches between the original and compressed video at the same timestamp for a quick quality check
• Lets compressed copies keep or remove the capture date; location metadata is not copied
• On iOS 26, user-started long compressions can continue in the background when the system allows
• Runs on your device and leaves your original videos untouched

Requirements

iOS 17 or later, on iPhone or iPad.

What it costs

Version 1.7: single videos are free, with no ads or watermark and nothing to sign up for. SizeCap Pro is a one-time purchase that adds batch runs of up to 50 videos; there is no subscription.

Getting help

Things to know in version 1.7

• A batch can contain up to 50 videos with SizeCap Pro. Every video in that batch uses the same cap and is compressed in sequence.
• Results are MP4 files. Automatic, the default, uses HEVC with two-pass encoding and falls back to a single pass on hardware that can't do two. Compatibility First uses H.264 for older devices. HDR video uses HEVC Main 10 with HDR color information whichever option you choose. Audio is AAC, and separate source audio tracks remain separate.
• Very short clips can land well under the cap. SizeCap verifies the upper limit; how close the result gets depends on the footage.
• The capture-date control applies to compressed copies. Location metadata is not copied. Sharing an original that is already below the cap leaves that original and its metadata unchanged.
• Background continuation on iOS 26 is controlled by the system and can still be stopped for resource or time limits.

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SizeCap 视频压缩到指定大小

在 iPhone 和 iPad 上压缩单个视频，或用专业版一次选择最多 50 个。SizeCap 全程在设备本地处理，逐个核对成品的真实字节数，只交付不超过你所设上限的结果。