Slow motion or speed up videos on iPhone from 0.25× to 4× — preview, mute audio, batch export, segment speed. Save to Photos with Video Speed • Slow Mo Editor.
Download our app: Video Speed • Slow Mo Editor on the App Store — slow mo from 0.25×, speed up to 4×, real-time preview, mute or keep audio, import from Photos or Files. Pro: 1080p, batch up to 10, segment speeds. Free to start.
Short answer: To slow down or speed up a video on iPhone, open Video Speed • Slow Mo Editor, pick a clip from Photos or Files, set speed between 0.25× and 4×, preview the new duration, then export to Photos. Need many clips? Pro batch export handles up to 10 at once. Need slow intro + fast middle? Pro segment speed applies different rates in one timeline.
If you searched slow motion video iPhone, speed up video iPhone, change video speed, slow mo editor, fast forward video, timelapse style, or batch video speed — this is the complete guide.
Table of contents
- What “change video speed” means
- Why iPhone Photos alone isn’t enough
- Meet Video Speed • Slow Mo Editor
- See the app in action
- Feature deep-dive
- How to slow mo a video on iPhone
- How to speed up a video on iPhone
- Speed presets (Slow-Mo → Hyper)
- Batch export up to 10 videos (Pro)
- Segment speed in one clip (Pro)
- Import from Photos or Files
- Audio: mute or keep
- Free vs Pro (honest)
- Use cases: reels, sports, lectures, drone
- Troubleshooting
- Quick FAQ
- Get the app
What “change video speed” means
Changing video speed rewrites how long each frame is shown:
| Speed | Effect | Typical use |
|---|---|---|
| 0.25× – 0.5× | Strong slow motion | Sports, action detail, dance |
| 0.75× | Gentle slow-mo | Cinematic moments |
| 1.0× | Original | Baseline |
| 1.25× – 1.5× | Slightly faster | Lectures, long talks |
| 2.0× – 3.0× | Fast / hyper | Vlogs, montages |
| 4.0× | Max fast | Time-lapse style pacing (not a true interval timelapse camera mode) |
Duration math: a 60-second clip at 2× exports as ~30 seconds; at 0.5× it becomes ~120 seconds. The app shows the new duration in preview before you export.
Why iPhone Photos alone isn’t enough
Apple Photos and iMovie can do some speed work, but creators often want:
- A dedicated speed slider with clear presets
- Batch speed changes for a whole reel stack
- Segment speeds (slow the goal, speed the walk-up)
- Import from Files (Downloads / iCloud), not only Photos
- Fast export without a full timeline editor
Video Speed • Slow Mo Editor is built for that single job: change speed → preview → save.
Meet Video Speed • Slow Mo Editor
App: Video Speed • Slow Mo Editor
Category: Photo & Video · Size: ~10.9 MB
Requires: iOS 17+ / iPadOS 17+
Developer: Muhammad Mujahid Khan (Just Clack)
| Capability | Spec |
|---|---|
| Speed range | 0.25× → 4× (stepped presets + slider) |
| Preview | Real-time; see new duration before export |
| Audio | Mute or keep original |
| Import | Photos or Files |
| Export | Save to Photos · Free 720p · Pro 1080p |
| Batch (Pro) | Up to 10 videos, same speed |
| Segments (Pro) | Different speeds on parts of one clip |
| Languages | English + 40+ localizations |
See the app in action
| Choose a clip | Slow motion | Speed up |
|---|---|---|
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| Batch export | Segment speeds | Export |
|---|---|---|
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Feature deep-dive
Slow motion & fast forward
- Slow to 0.25× for sports, action, and detail
- Speed to 4× for vlogs, reels, and time-lapse-style pacing
- Presets: Slow-Mo (0.5×), Normal (1×), Lecture (1.5×), Fast (2×), Hyper (3×)
- Fine control with the slider (0.05 steps in the engine)
Real-time preview
Watch the paced clip and confirm the new length before you burn an export. No guessing.
Batch export (Pro)
Change the speed of up to 10 videos in one flow — ideal for reel packs, sports series, and drone dumps. Most speed apps force one-by-one; batch is the time saver.
Segment speed (Pro)
Split the timeline and apply different speeds to different parts of the same clip — e.g. slow the highlight, speed the setup.
Photos + Files import
Pick from the photo library or Files (Downloads, iCloud Drive, and other Files locations). Finished videos save back to Photos.
Project history
Recent projects stay handy so you can reopen and tweak instead of starting from scratch every time.
How to slow mo a video on iPhone
- Install Video Speed • Slow Mo Editor.
- Tap to choose a video from Photos or Files.
- Select the Slow-Mo preset (0.5×) or drag toward 0.25×.
- Preview — confirm the longer duration feels right.
- Toggle mute if you don’t want stretched audio.
- Tap Export → save to Photos.
Slow-mo tips
- Start at 0.5×; go to 0.25× only for short action beats.
- Mute audio when pitch/stretch sounds unnatural.
- Keep free storage available — exports need room on device.
- Very long source clips (up to ~1 hour supported in-engine) take longer to render.
How to speed up a video on iPhone
- Open the same app and pick your clip.
- Tap Lecture (1.5×), Fast (2×), Hyper (3×), or slide up to 4×.
- Speeds above 2× require Pro (free tier caps at 2× for export).
- Preview the shorter duration.
- Export to Photos.
Speed-up tips
- 1.5× is ideal for lectures and meetings.
- 2×–3× works for travel montages and “get to the point” vlogs.
- 4× for aggressive hyperlapse-style pacing — watch for jumpy cuts.
- Keep audio if music still fits; mute if speech becomes chipmunked.
Speed presets
| Preset | Speed | Best for |
|---|---|---|
| Slow-Mo | 0.5× | Sports, dance, detail |
| Normal | 1.0× | Original pacing |
| Lecture | 1.5× | Classes, podcasts on video |
| Fast | 2.0× | Vlogs, recaps (free max export) |
| Hyper | 3.0× | High-energy montages (Pro) |
| Slider | 0.25×–4× | Exact control |
Batch export up to 10 videos (Pro)
- Open Batch Export.
- Select up to 10 clips.
- Set one shared speed.
- Export the stack to Photos.
Why it matters: creators who film 5–10 similar clips (drills, product spins, drone passes) stop repeating the same edit ten times.
Segment speed in one clip (Pro)
- Enable segment mode (Pro).
- Split the timeline at key moments.
- Set each segment’s speed independently.
- Preview the full paced story.
- Export once.
Example: walk-up at 2× → dunk at 0.5× → celebration at 1×.
Import from Photos or Files
| Source | When to use |
|---|---|
| Photos | Camera roll, Recents, albums |
| Files | WhatsApp/Telegram saves, Downloads, iCloud Drive, AirDrop folders |
Large files show a warning around 500 MB; free tier accepts up to ~1 GB, Pro up to ~4 GB per the in-app limits. Keep ~100 MB free storage for export temp files.
Audio: mute or keep
- Keep audio when music still matches the new pace.
- Mute for slow-mo sports (stretched audio often distracts) or when you’ll add a soundtrack in CapCut/InShot later.
- Default lean in the engine favors muted exports for clean social clips — toggle as needed.
Free vs Pro (honest)
Based on the in-app monetization policy and product facts:
| Free | Pro | |
|---|---|---|
| Speed range for export | Up to 2× (0.25×–2×) | Full 0.25×–4× |
| Export quality | 720p | 1080p (highest-quality preset available) |
| Daily exports | Limited (free daily allowance; ads may show) | Unlimited |
| Batch export (≤10) | — | ✅ |
| Segment speed | — | ✅ |
| Ads | May appear | No ads |
Subscriptions (App Store): Weekly ~$2.49 · Monthly ~$6.99 · Yearly ~$29.99 — charged to Apple ID; cancel in Settings → Apple ID → Subscriptions at least 24 hours before renewal.
Note: Always check the live paywall for the exact free daily count and any promotional trials — wording can update with App Store Connect.
Use cases
| Creator | Speed recipe |
|---|---|
| Reels / TikTok | 1.5×–2× talking heads; 0.5× product detail |
| Sports | 0.25×–0.5× on the highlight; batch game clips |
| Students | 1.5× Lecture preset on recorded classes |
| Travel vlog | 2×–3× walking segments |
| Drone | Batch 2×–4× for sky packs |
| Coaches | Segment: slow skill, normal talk-through |
Troubleshooting
| Issue | Fix |
|---|---|
| Speed above 2× locked | Upgrade to Pro (Hyper 3× / 4×) |
| Export blocked today | Free daily limit reached → wait or go Pro |
| Batch grayed out | Pro feature — unlock Batch Export |
| Can’t find Downloads video | Import via Files, not only Photos |
| Export fails / storage | Free up space; avoid huge 4K hour-long sources on free tier |
| Audio sounds weird | Mute and add music in your social editor |
| Preview fine, Photos missing | Check Photos permissions; look in Recents |
Quick FAQ
How do I make slow motion video on iPhone?
Open Video Speed • Slow Mo Editor, set 0.25×–0.5×, preview, export to Photos.
How do I speed up a video on iPhone?
Same app — use 1.5×–4× (speeds above 2× need Pro).
What’s the max speed?
4×. (Ignore outdated “20×” claims on old listings — the app max is 4×.)
What’s the slowest speed?
0.25×.
Can I change speed for multiple videos at once?
Yes — Pro batch export up to 10 clips.
Can different parts of one video have different speeds?
Yes — Pro segment speed.
Does it work from Files / Downloads?
Yes — import from Photos or Files.
What resolution do I get?
Free exports at 720p; Pro at 1080p.
Do I need an account?
No.
Is this a full video editor with trim/GIF?
No — it’s a focused speed tool (preview, mute, export, batch, segments). Use another app if you need trim boards or GIF.
ASO note for App Store searchers
If you found this while searching slow mo, speed up video, change video speed, slow motion editor, fast forward video, or batch video speed, the matching app is:
→ Video Speed • Slow Mo Editor
Subtitle focus: Slow Mo, Speed Up & Batch
Related Just Clack media tools: MP3 Converter • Video to Audio
Get the app
Slow it down. Speed it up. Batch the stack. Preview first — then save to Photos.
→ Download Video Speed • Slow Mo Editor on the App Store
More from Just Clack: MP3 Converter • Video to Audio · Circle Crop · Arabic Calligraphy Generator · All our iOS apps
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