Free Online File Size Reducer & Compressor
Free Online File Size Reducer & Compressor
FileSizer helps you reduce file size without losing quality. Compress images, resize photos, convert formats, and create PDFs directly in your browser—fast, secure, and beginner-friendly.
If your files are too large for websites, email attachments, WhatsApp sharing, or faster page speed, our File Size Reducer tools make optimization simple.
A File Size Reducer decreases the size of your images or documents so they upload faster, load quicker on websites, and take less storage—without making them look bad or unreadable.
These step-by-step guides match real search intent and help beginners use the tools correctly.
Reduce image size for websites, email, and WhatsApp using our smart compression.
Open Image Compressor →Fix dimensions for thumbnails, blog posts, ads, and social media formats.
Open Resize & Crop →Convert to the right format for quality, transparency, or speed.
Open Image Converter →Merge multiple images into a single PDF for submission and sharing.
Open Image to PDF →Access every tool in one place for faster workflows.
Open All-in-One →Convert WebP to JPG/PNG for platforms that don’t support WebP.
Open WebP Converter →Smaller images load faster, improve Core Web Vitals, and help SEO. Start by compressing your largest images and using WebP where possible for better performance.
Use these tips to get the smallest file size with the best clarity.
JPG is best for photos, PNG for transparency, and WebP for modern websites with smaller size and strong quality.
If you only need a 1200px image, don’t keep a 5000px file. Resize first using Resize & Crop, then compress.
Medium compression usually gives the best balance. It keeps images sharp while reducing size significantly.
FileSizer is made for everyone who needs faster uploads and smaller files.
Compress images to improve speed and ranking signals.
Reduce file sizes for forms, assignments, and portals.
Share documents and media faster without storage stress.
Quick answers about file compression, formats, and quality.
FileSizer is a fast and free File Size Reducer that compresses images and optimizes files for websites, email, and sharing.
Yes. Use medium compression and resize to the required dimensions first for the best quality-to-size balance.
Yes. Smaller files improve page speed and user experience, which supports better SEO performance.
WebP is usually best for modern websites. JPG is ideal for photos, and PNG is best for transparency.
Yes. Upload multiple images in Image to PDF, arrange order, and download one combined PDF.
Yes. All FileSizer tools are free and work directly in your browser.
FileSizer is a complete File Size Reducer designed for fast, safe, and simple file optimization. Compress images, resize photos, convert formats, and create PDFs in seconds. By reducing file size, you improve website speed, support SEO, and make sharing easier on every platform.