Free Online Video Compressor — Reduce Video File Size
Compress video files by up to 90% right in your browser. The best free online video compressor and video size reducer — compress MP4, MOV, AVI, MKV, and WebM with GPU acceleration. No uploads, no sign-up, no watermarks. Your videos never leave your device.
Drop your video here or click to browse
Supports MP4, WebM, MOV, MKV, AVI and 10+ more formats · Max 4GB
How It Works
Compress your video in 3 simple steps
Upload Your Video
Drag and drop or browse to select your video file. We support MP4, MOV, AVI, MKV, WebM, and 10+ more formats — up to 4GB. Large files (1GB+) will show an estimated processing time based on your system.
Choose Settings & Format
Pick a quick preset (Smallest, Balanced, or Best Quality), set a target file size for Discord or WhatsApp, or manually adjust resolution, quality, audio, and output format (MP4, WebM, MOV, AVI, or MKV).
Download, Trim & Share
Compression runs entirely in your browser with GPU acceleration. Once done, download your video, trim unwanted segments, view a detailed compression report with technical parameters, and share your results on social media.
Why Choose VideoReducer?
The most private and fastest way to compress video
100% Private & Secure
Your videos never leave your device. All compression happens locally in your browser using WebAssembly. No uploads, no servers, no tracking. Unlike cloud-based video compressors that store your files, our video compressor processes everything on your device — your data stays yours.
2x GPU-Accelerated Compression
Uses WebCodecs API with 2x playback acceleration for hardware-accelerated encoding. Up to 8x faster than traditional WASM-only solutions. Our video compressor processes large files in seconds, not minutes. Compress a 500MB video in under 60 seconds.
Up to 90% Size Reduction
Smart encoding presets achieve maximum compression while preserving visual quality. Reduce a 200MB video to under 25MB in seconds. Choose from 4 compression levels: 90% smaller, 70% smaller, 50% smaller, or 30% smaller. The best video compressor for email, Discord, and WhatsApp.
5 Formats, H.264 & H.265, Trimming
Compress and convert to MP4, WebM, MOV, AVI, or MKV. Supports H.264 and H.265 (HEVC) codecs for maximum compatibility and efficiency. Built-in video trimmer lets you cut unwanted segments. All processing happens locally — no uploads required.
Works on Any Device, 4GB Max
Runs on Chrome, Safari, Firefox, and Edge. Desktop and mobile. No app installation required — just open and compress. Our online video compressor works everywhere, with files up to 4GB — 4x larger than most cloud-based compressors.
Free Forever, No Watermark
Completely free with no sign-up, no credits, no watermarks. No hidden limitations or file size restrictions. The best free video compressor online — now with shareable compression reports and social media integration.
Common Use Cases
Perfect for every scenario where file size matters
Discord
8MB / 10MB / 25MB / 50MB / 100MB limits
16MB video limit
25MB Gmail / 20MB Outlook
Web Upload
Faster page loads
Storage Saving
Free up disk space
Social Media
Instagram, TikTok, YouTube
Format Conversion
MP4, WebM, MOV, AVI, MKV
Video Trimming
Cut unwanted segments
Popular Compression Tools
Specialized presets for every platform and format
Compress Video for Discord Online Free
Reduce video file size for Discord (8MB, 10MB, 25MB, 50MB, 100MB limits). Free online Discord video compressor. No upload, no sign-up, no watermark.
Compress Video for WhatsApp Online Free
Reduce video file size for WhatsApp (16MB limit) and WhatsApp Status. Free online WhatsApp video compressor. No upload, works in browser.
Compress Video for Email Online Free
Reduce video file size for email attachments (25MB Gmail, 20MB Outlook). Free online email video compressor. No upload, no sign-up.
Compress Video for Instagram Online Free
Reduce video file size for Instagram Reels, Stories, and posts. Free online Instagram video compressor. No upload, no sign-up, no watermark.
Compress Video for TikTok Online Free
Reduce video file size for TikTok (287MB limit). Free online TikTok video compressor. Optimize for vertical 9:16 format. No upload, no watermark.
Compress Video for YouTube Online Free
Reduce video file size for YouTube uploads. Free online YouTube video compressor. Maintain quality while reducing size. No upload, no sign-up.
Reduce MP4 File Size Online Free
Reduce MP4 file size online for free. Compress MP4 videos by up to 90% without quality loss. No upload, no sign-up, no watermark. Works in browser.
Reduce MOV File Size Online Free
Reduce MOV file size online for free. Compress MOV videos from iPhone, QuickTime, and cameras. No upload, no sign-up, no watermark. Browser-based.
Reduce AVI File Size Online Free
Reduce AVI file size online for free. Compress old AVI videos to modern MP4 format. No upload, no sign-up, no watermark. Browser-based compression.
Reduce WebM File Size Online Free
Reduce WebM file size online for free. Compress WebM videos for web optimization. No upload, no sign-up, no watermark. Browser-based compression.
Reduce Video File Size Online Free
Reduce video file size by up to 90% online for free. Supports MP4, MOV, AVI, MKV, WebM. No upload, no sign-up, no watermark. 100% private browser-based.
Video Size Reducer Online Free
Free video size reducer. Reduce video size by up to 90% online. Supports MP4, MOV, AVI, MKV, WebM. No upload, no sign-up, no watermark. 100% private.
Trusted by Users Worldwide
Join users from 100+ countries who compress videos with our tool
"This is exactly what I needed — no uploads, total privacy. I compress videos for clients without any worry about data security."
Sarah Mitchell
Content Creator
"I use this to compress videos for Discord every day. The GPU acceleration is real — it's incredibly fast compared to other tools I've tried."
Alex Kim
Gamer & Streamer
"Reduced my iPhone videos from 200MB to under 25MB in seconds. The quality is great and I didn't have to install any software."
Michael Torres
iPhone User
Frequently Asked Questions
Everything you need to know about video compression
Is my video uploaded to your server?
No. All compression happens entirely in your browser using WebAssembly and WebCodecs. Your video files never leave your device — this is 100% private and secure. Unlike cloud-based video compressors that upload your files to their servers and delete them after 24 hours, VideoReducer processes everything locally on your computer or phone. Your videos are never stored on any server, making our video compressor the safest choice for confidential or sensitive videos.
What video formats and codecs are supported?
We support MP4, WebM, MOV, MKV, AVI, WMV, FLV, M4V, OGV, 3GP, MPEG, and TS as input formats — over 40+ formats total. For output, you can choose from 5 formats: MP4 (H.264), WebM (VP8), MOV (H.264), AVI (MPEG-4), or MKV (H.264). We support both H.264 and H.265 (HEVC) codecs. MP4 with H.264 is recommended for maximum compatibility across all devices and platforms. Our video compressor handles all major formats seamlessly with automatic codec selection.
How long does video compression take?
With our 2x GPU acceleration (WebCodecs API), a 5-minute 1080p video typically compresses in 5-15 seconds — twice as fast as before. A 500MB video usually takes 30-90 seconds depending on your hardware. We show an estimated time based on your system's CPU cores, memory, and GPU capabilities before you start. Our video compressor is optimized for speed — processing large files much faster than traditional cloud-based online compressors, with no upload time.
Can I compress videos for Discord?
Yes! We have built-in presets specifically for Discord: 8MB for Discord Legacy, 10MB for Discord Free, 25MB for Discord Nitro Basic, 50MB for Discord Nitro, and 100MB for large file sharing. Just select the Auto mode and pick your target size — our video file size reducer will calculate the optimal bitrate automatically to hit your target.
Can I convert video formats while compressing?
Yes! In Manual mode, you can choose from 5 output formats: MP4 (H.264), WebM (VP8), MOV (H.264), AVI (MPEG-4), or MKV (H.264). The default is MP4 for best compatibility, but you can convert to any supported format while simultaneously reducing file size. This makes our tool both a video size reducer and a format converter in one.
Can I trim my video after compression?
Yes! After compression, click the 'Trim Video' button to select and extract a specific segment of the compressed video. This is useful when you only need a portion of the video — for example, cutting a 30-second clip from a 5-minute recording. The trim feature uses stream copy when possible for instant processing, making our video size reducer also a powerful video editing tool.
What is the compression report feature?
After compression, you'll see a detailed report showing original size, compressed size, reduction percentage, compression time, and technical parameters (video codec, audio codec, bitrate, frame rate, sample rate, resolution). You can download this report as a PNG image with a VideoReducer.com watermark and share it on Twitter/X, Facebook, LinkedIn, Reddit, or via email to show off your compression results.
Does it work on mobile devices?
Yes, VideoReducer works on mobile browsers including Chrome for Android and Safari for iOS. However, for very large videos (500MB+), we recommend using a desktop browser for better performance and more available memory. The tool is fully responsive and optimized for both touch and mouse interfaces. Our online video size reducer is the perfect mobile solution for reducing video file sizes on the go.
Complete Guide to Reducing Video File Size
Everything you need to know about video compression, file size reduction, and choosing the right settings
Why Reduce Video File Size?
Video files are notoriously large. A 4K recording from a modern smartphone can easily exceed 500MB per minute, making it impossible to share via email, messaging apps, or social media platforms with size limits. A video size reducer solves this problem by compressing the file while maintaining acceptable visual quality. Whether you need to compress video for Discord's 8MB limit, WhatsApp's 16MB limit, or email's 25MB limit, our free online video file size reducer handles it all without uploading your files to any server.
How Video Compression Works
Video compression works by removing redundant data and reducing the bitrate of video and audio streams. Our video size reducer uses two complementary technologies: the WebCodecs API with 2x playback acceleration for GPU-accelerated encoding (available in Chrome 94+, Edge 94+, Safari 16.4+, and Firefox 130+), and FFmpeg compiled to WebAssembly as a fallback. The H.264 codec with configurable Constant Rate Factor (CRF) values balances quality and size — lower CRF (18-23) means higher quality but larger files, while higher CRF (28-38) produces smaller files with some quality loss. This makes our mb reducer video technology both fast and efficient, processing videos up to 4GB in size.
Best Video Size Reducer Settings for Different Platforms
Different platforms have different file size limits and recommended settings. Here's a quick reference for using our video file size reducer:
- Discord: 8MB (Legacy), 10MB (Free), 25MB (Nitro Basic), 50MB (Nitro), 100MB (Large). Use Auto mode with target size.
- WhatsApp: 16MB limit for videos. Use Auto mode with 16MB target, or reduce resolution to 720p.
- Email: 25MB for Gmail, 20MB for Outlook. Use Auto mode with 25MB target preset.
- Instagram: 15MB for Stories, 650MB for Feed. Use Quick mode with Best Balance preset.
- TikTok: 287MB limit, 9:16 vertical format. Use Manual mode with 720p resolution.
- YouTube: No strict limit, but smaller uploads faster. Use Quick mode with Best Quality preset.
Video Quality Reducer: Balancing Size and Quality
When using a video quality reducer, the key is finding the right balance between file size and visual quality. Our tool offers three quick presets: Smallest File (CRF 32, 720p) for maximum compression — ideal for email and messaging apps; Best Balance (CRF 26, 1080p) for great quality with significant size reduction — recommended for most use cases; and Best Quality (CRF 20, original resolution) for minimal quality loss — perfect for archiving. For advanced users, Manual mode offers full control over CRF, resolution, frame rate, audio bitrate, and output format (MP4 H.264 or WebM VP8).
Why Choose a Browser-Based Video Size Reducer?
Traditional online video compressors upload your files to their servers, process them, and send the result back. This approach has three major problems: privacy risks (your videos are on someone else's server), upload/download time (slow for large files), and file size limits (servers can't handle very large videos). Our browser-based video file size reducer solves all three: 100% private (videos never leave your device), instant (no upload time), and supports files up to 4GB. The WebCodecs API provides GPU acceleration for blazing-fast compression, while the FFmpeg WebAssembly fallback ensures compatibility with all browsers.
Tips for Maximum Video Size Reduction
To get the smallest possible file size with our video size reducer, follow these tips:
- Reduce resolution strategically: 4K to 1080p produces minimal visible quality loss but halves the file size. 1080p to 720p is acceptable for web sharing.
- Lower the frame rate: Reducing from 60fps to 30fps can save 30-40% file size with minimal quality impact for most content.
- Adjust audio bitrate: Voice-only content can use 64-96kbps; music benefits from 128-192kbps. Mute audio entirely if not needed.
- Use the right format: MP4 with H.264 offers the best compatibility. WebM with VP8 can be more efficient for web content.
- Trim unnecessary parts: Use our built-in trim feature to cut unwanted segments before compressing.
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<!-- VideoReducer.com - Free Online Video Compressor -->
<iframe
src="https://www.videoreducer.com/?embed=true"
width="800"
height="600"
style="border:0;border-radius:12px;overflow:hidden"
allow="clipboard-write"
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title="Free Video Compressor by VideoReducer">
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<p style="text-align:center;font-size:12px;color:#888;margin-top:8px">
Powered by <a href="https://www.videoreducer.com/" target="_blank" rel="noopener">VideoReducer.com</a> — Free Online Video Size Reducer
</p>What you get
- Full video compression tool with all features
- 100% browser-based — no server costs for you
- Supports MP4, MOV, AVI, MKV, WebM and 10+ formats
- GPU acceleration via WebCodecs API
- No API key or registration required
- Free forever — just keep the attribution link
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Get Started NowWorks on Chrome, Safari, Firefox, Edge · Desktop & Mobile