SmallFast
Compress
Email Video Compressor • Zero Server Uploads • 100% Private

Compress Video for Email
Fit Gmail, Outlook & Apple Mail Caps
Shrink Presentations, Bug Demos & Screen Recordings for Email

Email providers strictly cap attachments at 20MB to 25MB, and MIME encoding overhead reduces usable space even further. SmallFast compresses screen recordings, client deliverables, and presentation videos directly in your browser to ensure your emails deliver without bounce-backs.

✓Designed for Gmail (25MB), Outlook (20MB), and Apple Mail caps
✓Accounts for ~33% Base64 MIME encoding overhead in email bodies
✓Optimized for desktop screen captures, Loom demos, and slide presentations
✓Universal MP4 format opens natively in all email clients without plug-ins
✓Confidential business presentations stay 100% private on your machine
Start Compressing FreeHow It Works
Privacy Architecture

Why In-Browser Compression is 100% Private

Most online compressors secretly upload your media to their cloud servers, storing photos and videos where they can be scanned, logged, or compromised. SmallFast changes the paradigm entirely.

0B

0 Bytes Uploaded

Files stay strictly in your device memory. When you compress media with SmallFast, zero bytes of image or video data are transmitted over the internet.

⚡

Client-Side WebAssembly

We leverage modern WebAssembly (Wasm) and local hardware acceleration. Your CPU and GPU handle the compression math at full native speed.

🔍

Independently Verifiable

You do not have to take our word for it: open your browser Developer Tools (F12), inspect the Network tab, and observe that not a single upload request is made.

Simple 3-Step Process

How to Compress Media Online

Optimize high-resolution images and heavy videos in seconds right inside your browser window.

1

Select or Drop Files

Drag and drop your media into the online compressor or pick files from your computer or phone. Files load instantly into your browser memory without being uploaded anywhere.

2

Customize Quality & Size

Adjust quality sliders, pick target resolution, or convert format with instant visual comparison. Fine-tune until you achieve the exact balance of size and sharpness.

3

Download Compressed Media

Export your compressed images or videos directly to your device with one click, or package multiple items into a single ZIP file. Your originals remain untouched.

Universal Media Support

Formats Supported by Our Online Compressor

No need to install separate converters. Compress and convert modern web and production media formats.

MP4 (H.264 / AAC)

Native Browser Engine
Outlook compatibleApple Mail readyInstant inline playback

Guaranteed playback on Windows Outlook, macOS Mail, Gmail web, and mobile inboxes without requiring third-party codecs.

Screen Capture Optimization

Native Browser Engine
Sharp UI textCrisp cursor motionHigh legibility

Optimized encoding for software demos, Jira bug tickets, and customer support screencasts at 720p/1080p with CRF 26–28.

Voice Track Audio

Native Browser Engine
AAC-LC speech64–96 kbps voiceLow noise

Clean mono or stereo voice track encoding that saves vital bytes for video clarity while keeping voiceovers crisp.

The Difference

Traditional Cloud Converters vs SmallFast

FeatureTraditional Cloud SitesSmallFast In-Browser
File Upload RequiredYes (Slow, eats bandwidth)No (0 seconds upload)
Data Privacy & SecurityStored on remote servers100% Private (Never leaves device)
File Size CeilingsStrict limits (25MB-100MB)Large files (Powered by local CPU/GPU)
Queue & Waiting TimesQueued behind other usersInstant parallel compression
Account RequirementOften requires email / signupNo signup required for standard use
Common Questions

Frequently Asked Questions

What is the maximum video attachment size for Gmail, Outlook, and Yahoo?+
Gmail allows up to 25MB total message size. Microsoft Outlook and Office 365 default to 20MB (sometimes 25MB depending on organization policy). Apple Mail and iCloud enforce 20MB (without Mail Drop), and Yahoo Mail allows 25MB. Crucially, email attachments are encoded in Base64 MIME format, which inflates binary file size by roughly 33%. A 20MB raw video file can expand to over 26MB during transmission, causing server rejection. We recommend compressing to 15MB–18MB for reliable delivery.
How do I compress a screen recording, Loom video, or bug demo for an email ticket?+
For screen captures and UI walkthroughs, downscaling from 4K or 1440p down to 1080p or 720p at 30 fps delivers massive space savings. Because screen recordings have large static areas, modern H.264 encoders with CRF 26–28 can reduce file size by 85–90% while keeping text and mouse pointers razor-sharp.
Why should I send a compressed video attachment instead of a Google Drive link?+
Cloud sharing links often encounter permission roadblocks, corporate firewalls that block external storage domains, or spam filters. An attached MP4 video allows clients, executives, and support staff to preview and play the clip directly inside their inbox with zero friction.
Can I compress confidential business presentations or client demos safely?+
Yes, 100%. SmallFast runs completely in your local browser using client-side WebAssembly. No video data, confidential company information, or customer details are ever uploaded to any cloud server or third-party database.
Will recipients need special software or VLC to watch the compressed video?+
No. SmallFast produces standard MP4 files with H.264 video and AAC audio. This format is natively supported by Windows Outlook, Apple Mail on macOS/iOS, Gmail web and mobile apps, and Thunderbird without requiring plugins.
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Ready to compress files without uploading?

Try SmallFast right now in your browser. No registration required, zero bytes uploaded to any cloud server.

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