Audio quietly gone
The file is small and it plays — but the sound has disappeared, and nobody asked for that.
Coming soon For Mac, iPhone and iPad
Fits the limit.
Proves it still works.
Shrinks any video to fit Gmail, Discord or an upload form. Then plays it back, end to end, and shows you it’s safe to send.
Free, no watermark · Pro $14.99 once, on every device · Your videos never leave your device
Verified — safe to send17.2 MB of 18 MB · Gmail
- Under the limit
- Plays to the last frame
- Same length as the original
- Audio kept and audible
- Picture matches
- Original untouched
Made to fit where you send it
- Gmail 25 MB
- Outlook 20 MB
- iCloud Mail 20 MB
- Discord 20 MB
- WhatsApp 16 MB
- Messenger 25 MB
- Signal 100 MB
- Upload forms 10 · 50 · 100 MB
Email counts encoding overhead, so SizeFit aims lower: about 18 MB for Gmail’s 25 MB. Every limit, with sources →
The problem
“Smaller” isn’t the same as “still works”.
Shrinking a file is the easy half. These are the ways it goes wrong — usually noticed only after it was sent.
Files that won’t open
An export the recipient’s computer refuses to play, or a video that stops halfway through.
Originals at risk
A crash mid-export that takes the only copy of an important video with it.
How it works
From too big to safe to send.
Drop it, pick where it’s going, send it with proof. SizeFit remembers your destination for next time.
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Drop your videos
Drag clips onto the window or the Dock icon, pick them from Photos or Files, or use Finder’s Quick Action. SizeFit predicts the result before you start.
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Choose the destination
Gmail, Discord, WhatsApp, upload forms — SizeFit knows each limit and the fine print, like email’s 37% encoding overhead. Pro lets you type any size.
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Send it with proof
Apple’s hardware encoder does the work; if a file lands over, SizeFit tries again. Then every file is played back and checked — green means safe to send.
The verification slip
Nine checks.
Every file. Every time.
After each export SizeFit reopens the new file, decodes every frame and compares it with your original. If a check fails, the broken file isn’t saved — and one click retries with the safest settings.
Under the limit
Measured on the finished file, against the real target.
Opens and plays
A standard player opens it, without errors.
Plays everywhere
MP4 · H.264 · AAC by default, for Windows, Android and the web.
Plays to the last frame
Every frame decoded, so a file that breaks halfway is caught.
Same length
Within half a second of the original. No cut-off endings.
Audio kept
If the original has sound, so does the result.
Audio is audible
Loudness measured, so a silent track is flagged.
Picture matches
Sampled frames compared with the original, so a garbled or black picture fails.
Original untouched
Same size and date as before. Always read-only.
Shot on iPhone Pro
ProRes and Apple Log in. Ready‑to‑send color out.
ProRes runs up to 30 times larger than everyday iPhone video, and Apple Log looks flat and grey until it’s graded. SizeFit turns both into an MP4 that fits — in standard color, so it looks the way you shot it.
- 1.21 GB → 17.2 MB12 seconds of 4K ProRes 422 HQ in Apple Log, ready for Gmail in 11 seconds on an M1 Mac — and verified.
- Apple Log and Apple Log 2Recognized from the file itself, including iPhone 17 Pro’s wider Apple Wide Gamut. Nothing to set.
- Checked in true colorThe slip compares the result with your original in standard color, so the picture check measures compression, not the grade.
A neutral Rec.709 conversion, like a camera’s built-in look — not a creative grade. ProRes RAW isn’t supported yet. How to send ProRes and Apple Log →
See it for yourself
Compare the difference. Trim what won’t fit.
Don’t take the slip’s word for it: put the original and the result side by side, on the same frame.
Compare
Drag a divider across the same frame of the original and the result. SizeFit tells you in plain words how close it is.
Trim or split
Too long for the limit? The filmstrip shows exactly where your clip stops fitting — or split it into parts that each fit.
If it can’t fit, it says so. When even 480p can’t reach your limit at a watchable quality, SizeFit tells you plainly instead of exporting something unwatchable.
Mac · iPhone · iPad
One purchase. Every screen you send from.
The same engine and the same slip everywhere. Buy Pro once and it’s unlocked on all your devices with the same Apple Account.
iPad
Your videos on the left, the full slip on the right. Drag clips in from Files or Photos; keyboard shortcuts for everything.
iPhone
Pick from Photos, or share straight from the Photos app. Save the result back to Photos or send it from the share sheet.
Mac
Drop whole folders, right-click in Finder › Quick Actions, or share from Photos. PDFs too — images recompressed, text kept sharp.
Designed for iPhone Duo
Fold to compare.
Half-fold iPhone Duo: the original on one side, the result on the other. Stand it up to trim — video on top, filmstrip below.
Private by design
Your videos never leave your device.
No upload, no account, no tracking inside the app. Your original is opened read-only, every time.
On-device, offline
Compression and checks run on your Mac, iPhone or iPad. No internet needed.
Originals are read-only
SizeFit never writes to, replaces or deletes the file you give it. There’s no “delete original” anywhere.
No half-written files
Results appear only when they’re complete and verified. Quit midway and nothing partial is left behind.
The difference
The checks you’d otherwise do by hand.
Or skip, and hope. Here’s what SizeFit does for you on every file.
| When you need to | With SizeFit | The usual way |
|---|---|---|
| Hit a size limit | Pick the destination. SizeFit aims for the real limit and retries if it lands over. | Guess a quality setting, export, check the size, repeat. |
| Email a video | Encoding overhead (+37%) already counted. | Find out when Gmail turns it into a Drive link. |
| Be sure there’s sound | Presence and loudness measured. | Play it back and listen. |
| Be sure it plays to the end | Every frame decoded. | Scrub to the end and hope. |
| Keep the original safe | Opened read-only, never replaced. | Depends on the app. |
| Keep it private | Everything stays on your device. | Most web compressors upload your video. |
Pricing
Try it on your own videos first.
The free version has no watermark, no export limit and the full verification slip — so you can read the slip on your own clips before deciding.
Free
$0
- Every destination preset
- One file at a time, up to 1080p
- MP4 · H.264 + AAC
- Full verification slip, Compare and Trim
- Unlimited exports, no watermark, no account
Pro
$14.99 once
- Everything in Free
- Type any size you need
- Compress a whole batch at once
- HEVC for even smaller files
- Keep 4K and 1440p
- Choose where files are saved (Mac)
- One purchase for Mac, iPhone and iPad
Get notified at launch
Both arrive together on the App Store. Prices in USD; the App Store shows local pricing in your country. Not a subscription.
Does SizeFit upload my videos?
No. Compression and verification run entirely on your device. The app only downloads a small public list of platform size limits (presets.json), without sending any identifiers.
Why does SizeFit aim for about 18 MB when Gmail’s limit is 25 MB?
Email attachments are Base64-encoded, which makes them roughly a third larger, and the message headers count too. A file of about 18 MB stays under Gmail’s 25 MB message limit after encoding. More in our Gmail guide.
Which devices does it run on?
Mac with macOS 14 Sonoma or later, and iPhone and iPad with iOS and iPadOS 17 or later. Apple silicon is recommended on Mac for the fastest hardware encoding. Pro bought on one device unlocks the others with the same Apple Account.
Which formats does it open?
Videos macOS and iOS read natively — MP4, MOV and M4V, including iPhone HDR video, ProRes and screen recordings — plus PDFs on Mac. MKV, AVI and WebM are not supported today because Apple’s AVFoundation can’t read them; SizeFit tells you up front.
Does it handle ProRes and Apple Log from iPhone Pro?
Yes. ProRes from iPhone 13 Pro and later is compressed to a standard MP4, and Apple Log (iPhone 15 Pro and later) and Apple Log 2 (iPhone 17 Pro) are converted to standard Rec.709 color on the way, so the clip doesn’t arrive grey. It’s a neutral conversion, not a creative grade. ProRes RAW isn’t supported yet. More in our ProRes and Apple Log guide.
Will the video look worse?
Fitting a long video into a small limit always trades away some detail. SizeFit keeps the highest resolution that still looks good at the available size, and Compare shows the original and the result on the same frame so you can judge for yourself.
Where are compressed files saved?
On Mac, in Downloads as “name-sizefit.mp4” (Pro can pick another folder). On iPhone and iPad, in the Files app under SizeFit — and one tap saves to Photos or opens the share sheet. Existing files are never replaced.
Does it work offline? Do I need an account?
It works fully offline and there’s no account. Purchases and Restore Purchase go through the App Store.
Is SizeFit a subscription?
No. The free version stays free. Pro is a single one-time purchase.
Send it once. Send it right.
SizeFit is coming soon to the App Store for Mac, iPhone and iPad. Leave your email and we’ll send one message when it’s live.