Ninja Video Compress & Convert

Shrink file size, save space

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

The compressor is free, forever: pick a size, keep the quality, and nothing leaves your phone. Ninja Pro adds big batches, merge, speed, subtitles and more. Shrink big videos on your iPhone and keep the quality. Ninja compresses, converts and edits video entirely on the device — no upload, no account, no ads. Your videos never leave your phone. The compressor is free, forever: every size mode, every share preset, trim, crop, rotate, mute, convert and frame grab, with no watermark and no daily cap. MAKE BIG VIDEOS SMALL Six ways to decide how small, with a live size estimate before you commit: • Ninja Auto — reads each video's bitrate, resolution and codec and picks the biggest saving that still looks sharp • Quality — Extreme, High, Balanced, Small or Tiny • Target size — "fit this into 25 MB" • Percentage — aim each video at a share of its own size • Resolution — 2160p down to 240p • Manual bitrate — when you already know the number Hardware encoders do the work, so a 4K clip takes minutes, not an afternoon. SIZED FOR WHERE IT'S GOING Fifteen one-tap presets for messaging, email and social apps, each with the platform's real size cap, resolution and frame-rate ceiling — so the file fits the first time. SEE THE DIFFERENCE BEFORE YOU KEEP IT The Reveal puts the original and the compressed copy side by side at the same moment. Drag the divider, pinch in, and judge for yourself. IT WILL NOT DELETE THE WRONG THING Before an original is touched, the compressed copy must pass nine checks — it opens, its length matches, its audio survived, frames decode at the start, middle and end, it saved to your Photos library and reads back, and it is genuinely smaller. One failure and nothing is removed. Then you choose: keep both, move the original to the in-app Ninja Vault, move it to Recently Deleted (restorable for 30 days), or replace it in place, keeping its date and location so your library's timeline doesn't break. A FULL TOOLBOX Free: Convert · Trim · Crop · Rotate and flip · Mute · Grab a frame Ninja Pro: Cut the middle · Merge · Speed (0.25×–4×, pitch preserved) · Reverse · Watermark · Subtitles · Extract audio · GIF maker Twelve containers, including MP4, MOV, MKV and WebM. H.264, VP8 and MPEG-4 are free; H.265/HEVC, VP9 and AV1 come with Pro. Watermarks are your text or image — Ninja never adds its own branding. NINJA PRO Optional, for power users: batches of more than three videos, the eight advanced tools, H.265/VP9/AV1, and unlimited saved presets. Monthly, yearly, or a one-time Lifetime unlock. Pro is checked on your iPhone, so it works offline too. PRIVACY, WITHOUT THE ASTERISK No analytics. No crash reporting. No tracking. No sign-in. Ninja itself makes no network calls — there is no server to send your videos to. If something goes wrong, the error log stays on your phone unless you choose to share it. HONEST NOTES • Reverse is capped at one minute — it holds every frame in memory, and we'd rather refuse than crash. • Nine languages: English, Spanish, Portuguese, German, French, Hindi, Indonesian, Japanese and Russian. • Ninja bundles FFmpeg (LGPL) — attribution, license texts and the source offer are in Settings → Open source licenses. SUBSCRIPTION TERMS Payment is charged to your Apple Account when you confirm the purchase. Monthly and yearly subscriptions renew automatically at the same price unless canceled at least 24 hours before the end of the current period; your account is charged for renewal within the 24 hours before it ends. Manage or cancel anytime in your App Store account settings. Lifetime is a one-time purchase and does not renew. Terms of Use: https://ninjacompress.app/terms Privacy Policy: https://ninjacompress.app/privacy

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The developer, Aviad Katani, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

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    Accessibility

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    Information

    Seller
    Aviad Katani
    Size
    62.3 MB
    Category
    Photo & Video
    Compatibility
    Requires iOS 15.0 or later.
    • iPhone
      Requires iOS 15.0 or later.
    • iPod touch
      Requires iOS 15.0 or later.
    • Mac
      Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English
    Age Rating
    4+
    In-App Purchases
    Yes
    • Ninja Pro — Lifetime $14.99
    • Ninja Pro — Yearly $5.99
    • Ninja Pro — Monthly $0.99
    • Learn More
    Copyright
    © 2026 Katani Labs
  • Developer Website
  • Privacy Policy

    • More by Aviad Katani

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