Image Compressor
Reduce image file sizes directly in your browser with zero server uploads.
Open ToolCompress Your Files, Instantly
Reduce file sizes with simple, easy-to-use compression tools.
Drag and drop your files here, or
Client-side Image compression (JPG, PNG, WebP, SVG) active now • Fast, private in-browser compression for PDF, Video, Audio, and Office files.
Selected Files
Files are inspected privately in your browser. Select a dedicated tool workspace below to configure compression settings and process your files.
All Compression Tools
Choose a tool to reduce your file size.
Showing all 5 compression tools
5 formats
PDF Compressor
Reduce PDF file sizes with image downsampling and vector preservation directly in your browser.
Open ToolVideo Compressor
Compress video files using browser hardware acceleration with customizable quality and resolution.
Open ToolAudio Compressor
Optimize audio bitrates and normalize loudness across common audio formats in your browser.
Open ToolOffice Compressor
Reduce Word, PowerPoint, and Excel file sizes while preserving formatting and embedded media.
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Simple to Use
Clean, straightforward compression designed for minimal clicks and predictable results.
No Account Required
Free to use without registration, email capture, subscriptions, or paywalls.
Privacy-Conscious
Files are processed safely in your browser session without unnecessary remote uploads.
Modern Browsers
Works smoothly across desktop, tablet, and mobile browsers with zero software installs.
Platform Overview
Universal Online File Compression for Modern Workflows
SizePress is an all-in-one in-browser file compression platform built for professionals, creators, students, and businesses who need to reduce file sizes quickly without compromising data privacy. Unlike traditional cloud converters that transmit your sensitive files across remote servers, SizePress executes all compression algorithms directly inside your client browser session using WebAssembly, WebCodecs, and HTML5 Canvas.
Whether you need to bypass strict email attachment limits, accelerate website loading speeds, comply with university portal file size caps, or reclaim storage on your computer or mobile device, SizePress provides dedicated, format-optimized compression engines for every major digital file format.
Compression Engines
Five Dedicated Compression Engines for Every File Type
Image Compressor
The SizePress Image Compressor shrinks photos, digital graphics, and web visuals by up to 80% while retaining sharp visual clarity. Powered by browser-native canvas rendering and modern compression codecs, it strips unnecessary EXIF metadata, optimizes color quantization, and balances chroma subsampling for lightning-fast web delivery.
Easily batch-compress high-resolution camera captures, product photography, or presentation graphics without watermarks or quality degradation. Perfect for designers, e-commerce managers, and bloggers looking to improve Core Web Vitals and page speed.
PDF Compressor
The SizePress PDF Compressor dramatically reduces the size of scanned reports, digital contracts, eBooks, and portfolio documents. By re-encoding embedded raster graphics, subsampling fonts, and removing duplicate object streams, our client-side engine produces compact PDFs that upload seamlessly to legal, academic, and corporate portals.
Choose from multiple compression intensities or specify custom target size thresholds in KB or MB to meet exact upload constraints on job boards, government portals, and university admission systems.
Video Compressor
The SizePress Video Compressor leverages hardware-accelerated WebCodecs to shrink video footage without sending gigabytes of private media over the internet. Downscale 4K and 1080p clips to 720p or 480p, configure intelligent bitrate smoothing, or target precise megabyte limits for Discord, WhatsApp, and email attachments.
Export optimized MP4 or WebM containers with balanced visual fidelity and synchronized audio tracks, ensuring seamless playback across iOS, Android, macOS, and Windows devices.
Audio Compressor
The SizePress Audio Compressor optimizes voice notes, music tracks, podcast recordings, and sound effects using real-time Web Audio API and WebAssembly MP3/WAV/FLAC encoders. Select custom bitrates from 64 kbps to 320 kbps to achieve the ideal ratio between acoustic quality and file size.
Compress uncompressed WAV or lossless audio files into lightweight MP3s for faster sharing, audio message distribution, and compact device storage with zero server latency.
Office Document Compressor
The SizePress Office Compressor inspects and deflates bloated Microsoft Word (DOCX), PowerPoint (PPTX), and Excel (XLSX) files. Office documents frequently balloon in size due to uncompressed embedded slides, high-res photos, and redundant XML schemas.
Our modular client-side engine strips unused XML definitions, repacks internal zip archives with maximum deflate ratios, and safely downsizes embedded media without corrupting slide layouts, spreadsheet formulas, or document formatting.
Workflow
How to Compress Files Online in 3 Simple Steps
Select or Drop Your Files
Choose any image, PDF, video, audio track, or Office document from your device or drag it into the dropzone above.
Adjust Compression Settings
Pick your preferred compression preset, specify a target file size, or let our smart default balance size and quality.
Download Compressed File
Processing completes in seconds inside your browser. Download your optimized file individually or as a single ZIP archive.
Why SizePress
Why Choose SizePress for File Compression?
100% Private & In-Browser
Your files are never transmitted to remote cloud servers. All byte manipulation occurs entirely inside your device memory.
Zero Software Installation
Access high-performance compression tools directly in Safari, Chrome, Firefox, Edge, or mobile browsers without plugins.
No Account or Subscriptions
Completely free to use with no registrations, hidden limits, monthly paywalls, or forced email captures.
High-Fidelity Codecs
Advanced perceptual compression algorithms preserve crisp details while stripping unnecessary metadata and uncompressed streams.
Zero Server Uploads
Guaranteed Client-Side Privacy: Your Files Never Leave Your Device
At SizePress, file privacy is not a marketing promise—it is our core engineering architecture. Traditional compression sites upload your confidential legal documents, private photographs, personal videos, and business spreadsheets to cloud servers where they may sit in temporary buckets or get harvested for analytics.
SizePress operates on a zero-upload principle. By harnessing modern browser standards including Web Workers, WebCodecs, WebAssembly, and Canvas APIs, every single byte of your file is compressed locally within your own browser sandbox. Once you close your browser tab, no trace of your file remains anywhere on the web.
Frequently Asked Questions About Online File Compression
SizePress is a free in-browser file compression platform. It compresses images, PDFs, videos, audio, and Office documents directly on your device using client-side technologies like WebAssembly and WebCodecs without server uploads.
Yes, SizePress is 100% free with no hidden fees, paid tiers, monthly subscriptions, or daily compression quotas.
No. Your files never leave your computer or phone. All compression operations run locally inside your web browser session, guaranteeing complete privacy.
SizePress supports JPG, PNG, WebP, AVIF, GIF, SVG, PDF, MP4, WebM, MOV, MKV, MP3, WAV, OGG, FLAC, AAC, M4A, DOCX, PPTX, and XLSX files.
Images and PDFs can be up to 50 MB, audio files up to 500 MB, and videos and Office documents up to 2 GB per file.
Yes. SizePress supports batch multi-file processing. You can select multiple files of the same category and download them all together in a single ZIP archive.
Select the PDF Compressor, upload your document, and choose a target size like 2 MB or 5 MB. The tool re-encodes embedded graphics and removes redundant data to meet portal limits.
No. SizePress uses smart perceptual compression algorithms that eliminate invisible metadata and redundant bytes while preserving crisp visual clarity.
Yes. SizePress is fully responsive and optimized for mobile browsers including Safari on iOS and Chrome on Android without requiring an app download.
No installation is needed. SizePress runs instantly in any modern web browser without plugins, extensions, or third-party executables.