Reduce file size without compromising quality. Compress MP3, WAV, M4A, AAC, FLAC, and more audio formats, plus video formats like MP4, MOV, and AVI. Perfect for uploading to transcription services, sharing via email, or saving storage space while maintaining professional quality.
Secure uploads
Fast processing
Quality preserved
Drop your audio or video file here
or click to browse your files
Supported formats: audio or video
Maximum file size: 500MB
🔒 Your files are encrypted and automatically deleted after processing
filename.mp3Uploading...
0% complete · Calculating...
File uploaded successfully
filename.mp3
filename.mp3
Compressing file...
0% complete · Calculating...
Choose compression level
Select how much you want to reduce the file size. Higher compression = smaller files.
You'll preview and download after compression.
Compression failed. We couldn't process this file. Please try again.
5 common reasons:
• Unsupported or uncommon codec inside the file (file extension is supported, but the internal encoding isn't).
• File is corrupted or incomplete (upload interrupted, bad download, damaged container).
• File is too large or too long for current limits (size/duration/timeouts).
• Compression settings are not compatible (e.g., bitrate/sample rate/channel layout not valid for the chosen output).
• Temporary processing issue (server overload, browser memory/CPU limits, or a transient system error).
Need convert audio to text?
Choose human transcription for maximum accuracy, or AI transcription for fast results. We accept any audio or video format.
Reduce file sizes by up to 85% without sacrificing quality. Supporting all popular audio and video formats with intelligent compression optimized for transcription, sharing, storage, and cloud uploads.
Choose from four intelligent compression levels to perfectly balance file size reduction with quality preservation. Each level is optimized for specific use cases and quality requirements.
Maximum Compression reduces file size by 70-85%, ideal for email attachments, cloud storage, and bandwidth-limited uploads. Files become significantly smaller while maintaining acceptable quality for most playback scenarios.
High Compression achieves 50-70% size reduction with excellent quality retention, perfect for general sharing and storage optimization without noticeable quality degradation.
Balanced compression offers 30-50% smaller files with minimal quality impact, suitable for professional content that needs both efficiency and high fidelity. Fast & Light provides 15-30% reduction with quick processing and virtually imperceptible quality loss.
Best for:
File size optimization
Storage management
Upload speed improvement
Bandwidth savings
💡 Tip
Start with Maximum Compression for most files. If quality isn't satisfactory, try High or Balanced compression for better results.
Our compressor supports the 10 most popular audio formats and 10 most popular video formats, ensuring you can compress any media file you work with.
Audio formats include: MP3, WAV, AAC, FLAC, OGG, WMA, M4A, ALAC, AIFF, and OPUS. Compress large WAV files for easier sharing, reduce podcast file sizes, or optimize music libraries for mobile devices.
Video formats include: MP4, AVI, MOV, MKV, WMV, FLV, WEBM, MPEG, M4V, and 3GP. Perfect for reducing video file sizes for faster uploads to YouTube, Vimeo, social media, or transcription services.
The format is automatically preserved during compression - upload an MP4, get a smaller MP4. Upload a WAV, get a compressed WAV. No format conversion required unless you want it.
Best for:
Multi-format workflows
Universal compatibility
Format-specific optimization
Cross-platform sharing
💡 Tip
Compression works best on uncompressed or lightly compressed formats. Already-compressed MP3s or MP4s will see smaller size reductions.
Our compression engine uses advanced algorithms to identify and preserve the most important aspects of your audio and video while removing redundant data that doesn't affect perceived quality.
For audio, we analyze frequency content and dynamic range to apply psychoacoustic compression that maintains clarity and fullness while reducing file size. Voice content is optimized differently than music.
For video, we preserve key frames and motion detail while optimizing less-critical frames. Facial detail and text readability are prioritized, while static backgrounds are compressed more aggressively.
The system automatically adapts compression parameters based on your file type and selected quality level, ensuring optimal results without manual configuration.
Best for:
Professional content
Voice recordings
Video interviews
Presentation videos
💡 Tip
For voice-heavy content like podcasts or interviews, Maximum Compression often delivers excellent results with minimal quality impact.
Files compressed with our tool maintain the audio/video quality needed for accurate transcription, making them perfect for uploading to transcription services like GoTranscript.
Voice clarity and speech intelligibility are prioritized during compression, ensuring transcription accuracy isn't compromised even at higher compression levels. Background noise reduction is gentle to preserve context.
Smaller file sizes mean faster uploads to transcription platforms, reduced bandwidth usage, and lower costs if you're billed per GB uploaded. Your transcriptions arrive faster without quality concerns.
Whether you're transcribing interviews, meetings, podcasts, lectures, or legal proceedings, our compression maintains the fidelity required for professional transcription services.
Best for:
Transcription uploads
Meeting recordings
Interview files
Educational content
💡 Tip
Before uploading files to transcription services, compress them to save time and bandwidth while maintaining accuracy.
Compressed files upload dramatically faster than their original counterparts. A 500MB file compressed to 100MB uploads 5x faster, saving valuable time and reducing frustration.
For cloud storage services, transcription platforms, video sharing sites, and email attachments, smaller files mean quicker transfers and happier users. This is especially important with slower internet connections.
Businesses and professionals processing multiple files daily can save hours per week by compressing before uploading. Reduced upload times mean faster turnaround on projects and improved productivity.
Mobile users on cellular connections benefit enormously - smaller files consume less data, upload faster even on weak signals, and don't eat into monthly data caps.
Best for:
Cloud uploads
Remote collaboration
Mobile uploads
Limited bandwidth scenarios
💡 Tip
Compressing large files before cloud upload can reduce upload time from hours to minutes on typical home internet connections.
Compressing your media library can free up gigabytes or even terabytes of storage space on your devices, cloud accounts, and backup drives without deleting anything.
A collection of 100 hours of WAV audio (roughly 60GB) can compress down to under 10GB with Maximum Compression, or 15-20GB with High Compression while maintaining excellent quality.
Video compression savings are even more dramatic - a single hour of 1080p video can shrink from 10-20GB to 2-5GB, making your entire video library dramatically more manageable.
Reduced storage needs translate to cost savings on cloud storage subscriptions, larger effective capacity on existing drives, and faster backups of your media collection.
Best for:
Media libraries
Archive management
Cloud storage optimization
Backup efficiency
💡 Tip
Compress archived content you rarely access with Maximum Compression. Keep frequently-used files at Balanced or Fast compression.
Most email services limit attachment sizes to 25MB or less. Compressing files before attaching ensures they fit within these limits without splitting or using file transfer services.
Share recordings, videos, and presentations directly via email without resorting to Dropbox, WeTransfer, or other third-party services. Recipients can download instantly without extra steps.
Smaller files are easier to download for recipients, especially those on mobile devices or slower connections. This improves the likelihood they'll actually receive and view your content.
For messaging apps with file size restrictions (WhatsApp, Slack, Discord), compression ensures your media fits within platform limits while maintaining playback quality.
Best for:
Email attachments
Instant messaging
Quick sharing
Mobile recipients
💡 Tip
Target under 20MB after compression for email compatibility. Maximum Compression usually achieves this for files up to 100-150MB.
Our compression engine is optimized for speed, with most files processing in 30-120 seconds depending on size and complexity. You're not left waiting for extended periods.
Hardware acceleration leverages your device's capabilities when available, speeding up compression especially for video files. This ensures efficient processing without overloading your system.
Clear progress indicators show exactly where you are in the compression process, with accurate time estimates so you know when to expect results.
The system handles files up to 500MB efficiently, meaning even large video recordings or lengthy audio sessions compress in reasonable timeframes without requiring overnight processing.
Best for:
Time-sensitive projects
High-volume processing
Quick turnaround needs
Workflow efficiency
💡 Tip
Fast & Light compression level processes quickest while still delivering meaningful file size reduction.
After compression completes, preview your compressed file using the built-in audio/video player to verify quality meets your expectations before downloading.
Compare original vs. compressed versions side-by-side using the A/B comparison toggle. Switch instantly between versions to hear or see the difference and ensure quality is acceptable.
View detailed file information including original file size, compressed file size, and percentage reduction achieved. This transparency helps you make informed decisions about compression levels.
If the result isn't satisfactory, easily reset and try a different compression level without re-uploading. Test different quality settings to find the perfect balance for your needs.
Best for:
Quality verification
Testing compression levels
Learning optimal settings
Critical content review
💡 Tip
Always preview compressed files before downloading, especially when trying a new compression level or file type for the first time.
Your files are encrypted during upload and processing to ensure complete privacy and security. We use industry-standard encryption protocols to protect your media throughout the compression process.
All uploaded files and compressed versions are automatically deleted from our servers immediately after you download or within 24 hours, whichever comes first. We never store your media long-term.
No user accounts or registration required - simply upload, compress, and download. We don't track what files you compress or store any information about your compressions beyond temporary processing.
The compression process happens securely on our servers, but your files never leave the secure environment. Files are not shared, analyzed, or used for any purpose other than your requested compression.
Best for:
Sensitive media
Confidential content
Privacy-conscious users
Business files
💡 Tip
Your files are automatically deleted after processing. Download your compressed files promptly to ensure availability.
Frequently Asked Questions
Common questions about audio and video file compression
Upload your audio or video file to our compressor, choose your desired compression level (Maximum, High, Balanced, or Fast & Light), and click "Compress File". The tool automatically reduces file size while preserving quality based on your selected compression level. Maximum Compression achieves 70-85% smaller files, ideal for email attachments and uploads. Once processing is complete, preview and download your compressed file. The service is completely free with no registration required.
File size reduction depends on the compression level you choose and your original file type. Maximum Compression typically reduces files by 70-85%, High Compression by 50-70%, Balanced by 30-50%, and Fast & Light by 15-30%. Already-compressed formats like MP3 or MP4 will see smaller reductions than uncompressed formats like WAV or AVI. For example, a 100MB WAV file might compress to 15-30MB, while a 100MB MP3 might only compress to 70-85MB since it's already compressed.
Our compression uses intelligent algorithms to minimize quality loss while maximizing file size reduction. At Maximum and High compression levels, there will be some quality reduction, but it's typically imperceptible for most use cases like transcription uploads, general sharing, and playback. Balanced and Fast compression levels preserve quality very effectively with minimal perceptible loss. Voice recordings and podcasts compress exceptionally well with little quality impact. For critical applications requiring perfect quality, start with Balanced or Fast compression and test the results.
Upload your video file, select Maximum Compression for the smallest possible file size, and compress. Most email services limit attachments to 25MB, so Maximum Compression gives you the best chance of fitting within these limits. A 200MB video can often compress to under 40MB, and smaller videos can easily get under 25MB. After compression, check the resulting file size in the preview. If it's still too large, you may need to use a file transfer service, but compression significantly increases the likelihood of email compatibility.
Upload your MP3 file and select your desired compression level. While MP3 is already a compressed format, our tool can further reduce file size by re-encoding at a lower bitrate while maintaining acceptable quality. Maximum Compression can reduce MP3 files by 30-50%, which is useful for saving storage space or reducing upload times. This is especially effective for spoken content like podcasts, audiobooks, and voice recordings where ultra-high fidelity isn't critical. Music files will see more quality impact than voice.
WAV is an uncompressed format, so any compression will involve some quality tradeoff. However, using Balanced or Fast & Light compression levels preserves quality very effectively while still achieving significant file size reduction (30-50% smaller). For truly lossless compression of WAV files, consider converting to FLAC format instead using our file converter tool - FLAC provides 40-60% size reduction with zero quality loss. Use our compressor for WAV when you need smaller files and slight quality loss is acceptable.
Upload your MP4 file, choose your compression level based on your quality vs. size priority, and compress. Maximum Compression significantly reduces upload time by creating much smaller files - a 500MB MP4 might compress to 75-150MB depending on content, cutting upload time by 60-80%. High and Balanced compression still provide meaningful upload speed improvements with better quality preservation. Compressed MP4 files upload faster to transcription services, YouTube, cloud storage, social media, and any platform where large files slow you down.
Upload your audio file and select Maximum or High compression. Transcription services like GoTranscript require clear speech, but ultra-high fidelity isn't necessary for accurate transcription. Maximum Compression reduces file size dramatically (70-85%) while maintaining the speech clarity needed for professional transcription. This means faster uploads, reduced bandwidth usage, and quicker turnaround times. Your transcripts arrive faster without sacrificing accuracy. This is especially valuable for large files, multiple recordings, or users with slower internet connections.
Choose Maximum Compression for email attachments, transcription uploads, long-term storage, and situations where file size matters most. Use High Compression for general sharing and cloud uploads where you want significant size reduction with good quality. Select Balanced when quality is important but you still want meaningful size savings. Choose Fast & Light for quick processing with minimal quality loss, ideal when you need both quality and speed. For first-time compression of a file type, try Balanced and adjust from there based on results.
Upload your video and select High or Maximum compression depending on the platform. Social media platforms (Instagram, Facebook, TikTok, Twitter) have file size limits and will re-compress your video anyway, so pre-compressing reduces upload time without affecting final quality. Maximum Compression gets files uploaded faster, especially on mobile connections. The compressed video maintains sufficient quality for social media display since platforms optimize videos for their own specifications. Smaller files mean faster uploads and less data usage on cellular connections.
Upload your WAV file (which is uncompressed and very large) and select Maximum Compression for the greatest storage savings. A typical 60-minute WAV recording at 44.1kHz can be 600MB+, but compresses down to under 100MB with Maximum Compression, saving massive amounts of cloud storage space. For audio archives, voice recordings, and non-critical content, this compression maintains acceptable quality while freeing up gigabytes of storage. Process multiple WAV files to dramatically reduce your cloud storage needs and associated subscription costs.
Upload your HD video and select Balanced compression. This level preserves resolution and visual quality very effectively while still reducing file size by 30-50%. The compression works by removing redundant data and optimizing encoding efficiency without downscaling resolution or drastically reducing bitrate. HD detail, sharpness, and clarity remain intact for most viewing scenarios. For even better quality retention with some size savings, use Fast & Light compression. Only use Maximum or High compression if file size is more critical than preserving perfect HD quality.
Upload your podcast recording and select Maximum or High compression. Podcast files are typically long (30-90+ minutes), resulting in large files. Maximum Compression can reduce a 200MB WAV recording to 30-40MB, making distribution much easier. Podcast listeners prioritize content over perfect audio quality, so compression is widely acceptable. Smaller files mean faster uploads to hosting platforms, reduced hosting storage costs, quicker downloads for listeners, and less data usage for mobile listeners. The compressed audio maintains speech clarity and intelligibility.
Upload your audio or video file, select Maximum Compression, and compress before uploading to transcription platforms like GoTranscript. This reduces upload time significantly - a file that would take 20 minutes to upload might only take 4-5 minutes compressed. Speech clarity is preserved for accurate transcription even at Maximum Compression. Faster uploads mean quicker turnaround on your transcripts. This is especially valuable for users with slower internet connections, large files, or when processing multiple files for transcription.
Our compression preserves speech frequencies and clarity that are essential for accurate transcription. Even Maximum Compression maintains the vocal range and intelligibility needed for professional transcription services. Compression removes redundant audio data and background elements that don't affect speech understanding. Transcription accuracy depends primarily on speech clarity, recording quality, and background noise - not file size. You can confidently compress files before transcription upload without worrying about reduced accuracy, while benefiting from faster uploads and reduced costs.
Upload your video and select High or Balanced compression before uploading to YouTube. While YouTube will re-compress your video on their servers, pre-compressing dramatically reduces upload time, especially for large HD or 4K videos. A 2GB video might compress to 600MB-1GB, cutting upload time by 50-70%. YouTube's own compression means your pre-compression doesn't negatively affect final quality - viewers see YouTube's optimized version regardless. Faster uploads mean quicker publishing, less time waiting, and reduced frustration, especially on slower upload connections.
Upload your iPhone MOV file and select your desired compression level. iPhone videos, especially at 4K or 1080p, create very large MOV files. Maximum Compression can reduce these by 70-85%, making them much easier to share, upload, and store. High or Balanced compression preserves quality better if you're concerned about video appearance. Compressed iPhone videos are easier to email, upload to social media, share via messaging apps, and store in cloud services without consuming excessive space. The MOV format is preserved during compression.
Our tool processes one file at a time, but you can compress multiple files sequentially for archiving. Select Maximum Compression for greatest storage savings when archiving recordings, music libraries, or audio collections. A library of 100 hours of WAV audio (roughly 60GB) can compress down to under 10GB, freeing massive storage space. For archival purposes where files are rarely accessed but need to be preserved, Maximum Compression is ideal. Process each file through the compressor and build a compressed archive collection that takes fraction of the original space.
Upload your audio file and select Maximum Compression. Messaging apps like WhatsApp, Telegram, Slack, and Discord have file size limits for attachments. Maximum Compression ensures your audio fits within these limits while maintaining acceptable quality for the recipient. A 50MB recording might compress to 7-15MB, well under most messaging app limits of 16-25MB. Compressed audio also sends and downloads faster on mobile connections, improving the messaging experience for both sender and recipient. Voice recordings compress especially well with minimal quality impact.
Upload your FLAC file and select Maximum or High compression. While FLAC is already a compressed lossless format, our tool can reduce file size further by converting to lossy compression. This is useful when lossless quality isn't required and storage savings are priority. A FLAC music collection can be reduced by 60-80% while maintaining good listening quality. This is ideal for personal music libraries where critical listening isn't the goal, or for archiving voice recordings originally saved in FLAC. The storage savings can be substantial for large music collections.
Upload your video and select High or Maximum compression. Mobile devices have smaller screens where ultra-high quality is less noticeable, making compression ideal. Smaller file sizes mean faster loading, reduced data usage on cellular networks, and less storage consumption on devices with limited space. A compressed video plays smoothly on mobile while using less bandwidth and storage. This is especially important when sharing videos with mobile users or when uploading to platforms that will be viewed primarily on smartphones and tablets.
Upload your AVI screen recording and select Maximum Compression. Screen recordings, especially at high resolution and long duration, create enormous AVI files. Maximum Compression can reduce these by 70-85% while maintaining readability of on-screen text and visual clarity. This is crucial for tutorial videos, software demos, presentation recordings, and meeting captures. Compressed screen recordings are easier to share with team members, upload to learning platforms, attach to emails, and store in project folders without consuming excessive storage.
Our compressor preserves your original format during compression. Upload an MP3, get a smaller MP3. Upload an MP4, get a smaller MP4. The tool compresses the file by re-encoding with optimized settings and reduced bitrate, but maintains the same format container. This ensures compatibility is preserved - if the original file worked on your device or platform, the compressed version will too. You don't need to worry about format conversion or compatibility issues; just upload and compress, and the format stays the same.
Upload your meeting recording and select Maximum or High compression. Meeting recordings (Zoom, Teams, Google Meet) are often very large, especially for lengthy sessions. Maximum Compression can reduce a 2-hour meeting recording from 1-2GB down to 150-400MB. Screen shares, talking heads, and presentation content compress very effectively. Smaller files are easier to share with attendees, upload to company servers, attach to project documentation, and store for future reference. Speech clarity is maintained for reviewing discussion points.
Compression time varies by file size and complexity. Small files (under 50MB) typically process in 30-60 seconds. Medium files (50-200MB) take 1-3 minutes. Large files (200-500MB) can take 3-8 minutes depending on whether they're audio or video. Video compression generally takes longer than audio due to increased complexity. The tool provides accurate progress tracking and time estimates during processing. Fast & Light compression level processes quicker than Maximum Compression. Overall, our compression is optimized for speed while delivering excellent results.
Transcription
by a Professional Transcriber & Editor
Captions (FCC/SDH)
by a Professional Captioner
Transcript Editing & Proofreading
by a Professional Editor
Translation (text/audio/images)
by a Professional Translator
Subtitles
by a Professional Subtitler
Video Description (AD)
by a Professional Describer
Secure uploads
Fast processing
Quality preserved
